Joints Committee - User contributions [en]

Aerospace Applications of Quasi Static Modal Analysis with Riveted Joints Brandon Rapp Dec 2025

2026-01-22T19:08:00Z

Jadmin: Created page with "{{DISPLAYTITLE:Aerospace Applications of Quasi Static Modal Analysis with Riveted Joints by Brandon Rapp, Dec. 2025}} ==Aerospace Applications of Quasi Static Modal Analysis with Riveted Joints== Brandon Rapp Pratt & Whitney December, 2025 ===Abstract:=== Non-linear modeling of interfaces can be difficult, especially in the case of rivets where the mechanics of the assembly process drive complexities into the assembled joint. One method to bypass the analytical diff..."

{{DISPLAYTITLE:Aerospace Applications of Quasi Static Modal Analysis with Riveted Joints by Brandon Rapp, Dec. 2025}}
==Aerospace Applications of Quasi Static Modal Analysis with Riveted Joints==

Brandon Rapp

Pratt & Whitney

December, 2025

===Abstract:===

Non-linear modeling of interfaces can be difficult, especially in the case of rivets where the mechanics of the assembly process drive complexities into the assembled joint. One method to bypass the analytical difficulties of modeling riveted joints is to perform testing which is used to calibrate a non-linear joint model, such as a discrete Iwan element, which represents the non-linear friction interaction in the whole joint and replaces a detailed analytical evaluation. Stoker, Gilbert, and Blackham, have recently measured the non-linear response of a thin riveted beam and calibrated the IWAN parameters of such riveted interfaces. The riveted joint model thus derived is applied to two other systems, a riveted beam similar to the BYU system but with modified boundary conditions and a cylindrical duct with multiple layers of riveted sheet metal. Quasi-static modal analysis (QSMA) is used to predict the nonlinear behavior of these structures. These applications represent the extension of the QSMA process from subcomponents to industrial applications. The following discussion will review analysis methodology in applying the rivet IWAN joint, the use of QSMA to derive mode specific non-linear dynamics, application of extended masing rules to predict the non-linear single mode response to sine sweep base excitation input, and finally comparison to test data.

===Biography:===

Brandon Rapp received his B.S. and M.S. in Mechanical Engineering at Southern Illinois University, Edwardsville, and an additional M.S. in Applied Mathematics from the University of Washington. Brandon Rapp has over fifteen years of experience working in the aerospace field at Pratt and Whitney. His prior research has focused on nonlienar discontinuous systems, near-wall turbulent flow structural response, and industrial damping applications.

==Video Presentation ==
{{#widget:Youtube
|id = Au-AGusOY68
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Joint Mechanics]]
[[Category:Simulation Methods]]
[[Category:Quasi-Static]]

Vibration-induced friction modulation theory and applications Alessandro Cabboi Nov2025

2025-12-03T18:27:32Z

Jadmin:

{{DISPLAYTITLE:Vibration-induced friction modulation: theory and applications by Dr. Alessandro Cabboi, Nov. 20, 2025}}
==Vibration-induced friction modulation: theory and applications==

Dr. Alessandro Cabboi

TU Delft, Delft, Netherlands

November 20, 2025

===Abstract:===
In the last 6 years, TU Delft investigated the use of a slip-joint to connect offshore structures, such as wind turbine towers to their corresponding support structure. The slip joint, also sporadically used for telecommunication towers, is a direct steel-to-steel connection obtained by overlapping two identical conical sections over each other. The connection solely depends on the geometry and contact mechanism between the two steel surfaces, and the load transfer depends on the frictional stress between the surfaces in contact. Hence, the key challenge for such connection is to guarantee a proper fit and sound contact. To either enforce the fit and the sound contact or to loosen it, a vibration-assisted technique was explored at TU Delft. The goal of this technique is to take advantage of the interaction between friction and an imposed high-frequency vibratory load, to control and facilitate the initiation of sliding between the surfaces in contact. At first, experimental evidence of the developed methodology will be shown, using a 1:10 scaled model of the slip-joint. Subsequently, unique results are showcased, obtained by applying the vibration-assisted technique to decommission a real slip joint assembled offshore, in the North Sea. To explain the observed experimental data and the success of the applied technique, a slow-fast process is assumed, through a selection of simplified models (e.g. mass-spring systems, mass-rod systems). The slow process refers to the steady sliding state, while the fast process intends to encapsulate the vibratory load and includes its averaged effect on the slow process. Specifically, the slow-fast analysis enables the investigation of the interaction between the imposed high-frequency vibratory load and the friction force, which can facilitate the sliding process by means of an averaged reduction of the friction force. The simplified models and the assumed slow-fast process is solved through the method of direct separation of motion and a comparative analogy is shown with the harmonic balance method.

===Biography:===
After a PhD on vibration-based health monitoring (University of Cagliari, Italy), and several post-doctoral positions on nonlinear dynamics at the University of Cambridge, Imperial College London, University of Sheffield and TU Delft, in 2020, I took up the role of Assistant Professor at the section of Mechanics and Physics of Structures, in the Faculty of Civil Engineering and Geosciences at TU Delft. Currently, I am also serving as Subject Editor for the Journal of Sound and Vibration. My main research interest and expertise include:
* Experimental dynamics (laboratory and field tests);
* Contact mechanics, tribology and characterization of contact/friction laws;
* Friction-vibration interaction and nonlinear dynamics;
* Dynamic inverse problems, system identification and model updating.

==Video Presentation ==

{{#widget:Youtube
|id = k9eCJnObai8
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Experimental Techniques]]
[[Category:Tribology]]
[[Category:Friction and Hysteresis]]

Vibration-induced friction modulation theory and applications Alessandro Cabboi Nov2025

2025-12-03T18:20:56Z

Jadmin: Created page with "{{DISPLAYTITLE:Vibration-induced friction modulation: theory and applications. by Dr. Alessandro Cabboi, Nov. 20, 2025}} ==What does a number mean: a summary of uncertainty quantification methods in engineering== Dr. Alessandro Cabboi TU Delft, Delft, Netherlands November 20, 2025 ===Abstract:=== In the last 6 years, TU Delft investigated the use of a slip-joint to connect offshore structures, such as wind turbine towers to their corresponding support structure. Th..."

{{DISPLAYTITLE:Vibration-induced friction modulation: theory and applications. by Dr. Alessandro Cabboi, Nov. 20, 2025}}
==What does a number mean: a summary of uncertainty quantification methods in engineering==

Dr. Alessandro Cabboi

TU Delft, Delft, Netherlands

November 20, 2025

===Abstract:===
In the last 6 years, TU Delft investigated the use of a slip-joint to connect offshore structures, such as wind turbine towers to their corresponding support structure. The slip joint, also sporadically used for telecommunication towers, is a direct steel-to-steel connection obtained by overlapping two identical conical sections over each other. The connection solely depends on the geometry and contact mechanism between the two steel surfaces, and the load transfer depends on the frictional stress between the surfaces in contact. Hence, the key challenge for such connection is to guarantee a proper fit and sound contact. To either enforce the fit and the sound contact or to loosen it, a vibration-assisted technique was explored at TU Delft. The goal of this technique is to take advantage of the interaction between friction and an imposed high-frequency vibratory load, to control and facilitate the initiation of sliding between the surfaces in contact. At first, experimental evidence of the developed methodology will be shown, using a 1:10 scaled model of the slip-joint. Subsequently, unique results are showcased, obtained by applying the vibration-assisted technique to decommission a real slip joint assembled offshore, in the North Sea. To explain the observed experimental data and the success of the applied technique, a slow-fast process is assumed, through a selection of simplified models (e.g. mass-spring systems, mass-rod systems). The slow process refers to the steady sliding state, while the fast process intends to encapsulate the vibratory load and includes its averaged effect on the slow process. Specifically, the slow-fast analysis enables the investigation of the interaction between the imposed high-frequency vibratory load and the friction force, which can facilitate the sliding process by means of an averaged reduction of the friction force. The simplified models and the assumed slow-fast process is solved through the method of direct separation of motion and a comparative analogy is shown with the harmonic balance method.

===Biography:===
After a PhD on vibration-based health monitoring (University of Cagliari, Italy), and several post-doctoral positions on nonlinear dynamics at the University of Cambridge, Imperial College London, University of Sheffield and TU Delft, in 2020, I took up the role of Assistant Professor at the section of Mechanics and Physics of Structures, in the Faculty of Civil Engineering and Geosciences at TU Delft. Currently, I am also serving as Subject Editor for the Journal of Sound and Vibration. My main research interest and expertise include:
* Experimental dynamics (laboratory and field tests);
* Contact mechanics, tribology and characterization of contact/friction laws;
* Friction-vibration interaction and nonlinear dynamics;
* Dynamic inverse problems, system identification and model updating.

==Video Presentation ==

{{#widget:Youtube
|id =
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Experimental Techniques]]
[[Category:Tribology]]
[[Category:Friction and Hysteresis]]

Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals Moore July 2025

2025-07-08T18:57:58Z

Jadmin: /* Video Presentation */

{{DISPLAYTITLE:Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals by Keegan Moore, July 2025}}
==Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals==

Keegan Moore

Professor, Georgia Institute of Technology

July 8, 2025

===Abstract:===

This tutorial addresses the challenges of analyzing complex signals from nonlinear mechanical structures undergoing vibrations. Such signals, whether from measurements or simulations, are often non-stationary and rich in nonlinear features, demanding advanced processing techniques. We will introduce the wavelet transform (WT)and highlight its efficacy in providing time-frequency representations crucial for understanding transient behavior in nonlinear systems. The tutorial will also cover some signal decomposition methodologies including the wavelet-bounded empirical mode decomposition (WBEMD) for adaptive data-driven component separation and the inverse wavelet transform for targeted feature isolation. Furthermore, we will demonstrate how to use WBEMD for data-driven identification and characterization of nonlinear resonances between modes and components. Participants will gain insights into applying these tools to dissect vibrational responses, extract salient features, and better understand the intricate dynamics of nonlinear structures.

===Biography:===
Keegan J. Moore is an Associate Professor in Aerospace Engineering at the Georgia Institute of Technology where he leads the Moore Dynamics and Analytics Laboratory (MoDAL). He received his Ph.D. from the University of Illinois in 2018 and his B.Sc. from the University of Akron in 2014. He is an expert in nonlinear dynamics and vibrations and his research lies at intersection of theory, simulation, and measurements. His recent work focuses on novel system identification methods, non-reciprocity and energy guiding in nonlinear structures, the mechanics of loosening of bolts, autonomous vibration testing, and autonomous model updating. He is the recipient of the 2022 AFOSR Young Investigator Program Award and a 2023 NSF CAREER Award.

==Video Presentation ==
{{#widget:Youtube
|id = auT1QoIaPuQ
| height = 444
| width = 790
}}

==Slides==
{{#widget:PDF
|url =https://drive.google.com/file/d/1Ts92qe52bkIMiWNb0-kMxyPynvqQDAfH/preview
|height = 400
|width = 720
}}

Links to Repository and Video Tutorials

[https://github.com/KeeganJMoore/MoDALToolbox |MoDAL Toolbox on GitHub]

[https://www.youtube.com/@modal6780 |MoDAL YouTube Channel]

[https://www.youtube.com/watch?v=SnIOsVKzdaI&list=PLW7h3DNOAgFy88IaF5on76YDUoPq2Alaw |MoDAL Lecture Videos on Data-Driven Nonlinear Dynamics & Vibrations]

[[Category:Seminar_Series]]
[[Category:Overview]]
[[Category:Nonlinear System Identification]]
[[Category:Nonlinear Dynamics]]

Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals Moore July 2025

2025-07-08T16:39:12Z

Jadmin: /* Slides */

{{DISPLAYTITLE:Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals by Keegan Moore, July 2025}}
==Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals==

Keegan Moore

Professor, Georgia Institute of Technology

July 8, 2025

===Abstract:===

This tutorial addresses the challenges of analyzing complex signals from nonlinear mechanical structures undergoing vibrations. Such signals, whether from measurements or simulations, are often non-stationary and rich in nonlinear features, demanding advanced processing techniques. We will introduce the wavelet transform (WT)and highlight its efficacy in providing time-frequency representations crucial for understanding transient behavior in nonlinear systems. The tutorial will also cover some signal decomposition methodologies including the wavelet-bounded empirical mode decomposition (WBEMD) for adaptive data-driven component separation and the inverse wavelet transform for targeted feature isolation. Furthermore, we will demonstrate how to use WBEMD for data-driven identification and characterization of nonlinear resonances between modes and components. Participants will gain insights into applying these tools to dissect vibrational responses, extract salient features, and better understand the intricate dynamics of nonlinear structures.

===Biography:===
Keegan J. Moore is an Associate Professor in Aerospace Engineering at the Georgia Institute of Technology where he leads the Moore Dynamics and Analytics Laboratory (MoDAL). He received his Ph.D. from the University of Illinois in 2018 and his B.Sc. from the University of Akron in 2014. He is an expert in nonlinear dynamics and vibrations and his research lies at intersection of theory, simulation, and measurements. His recent work focuses on novel system identification methods, non-reciprocity and energy guiding in nonlinear structures, the mechanics of loosening of bolts, autonomous vibration testing, and autonomous model updating. He is the recipient of the 2022 AFOSR Young Investigator Program Award and a 2023 NSF CAREER Award.

==Video Presentation ==
{{#widget:Youtube
|id =
| height = 444
| width = 790
}}

==Slides==
{{#widget:PDF
|url =https://drive.google.com/file/d/1Ts92qe52bkIMiWNb0-kMxyPynvqQDAfH/preview
|height = 400
|width = 720
}}

Links to Repository and Video Tutorials

[https://github.com/KeeganJMoore/MoDALToolbox |MoDAL Toolbox on GitHub]

[https://www.youtube.com/@modal6780 |MoDAL YouTube Channel]

[https://www.youtube.com/watch?v=SnIOsVKzdaI&list=PLW7h3DNOAgFy88IaF5on76YDUoPq2Alaw |MoDAL Lecture Videos on Data-Driven Nonlinear Dynamics & Vibrations]

[[Category:Seminar_Series]]
[[Category:Overview]]
[[Category:Nonlinear System Identification]]
[[Category:Nonlinear Dynamics]]

Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals Moore July 2025

2025-07-08T16:38:18Z

Jadmin:

{{DISPLAYTITLE:Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals by Keegan Moore, July 2025}}
==Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals==

Keegan Moore

Professor, Georgia Institute of Technology

July 8, 2025

===Abstract:===

This tutorial addresses the challenges of analyzing complex signals from nonlinear mechanical structures undergoing vibrations. Such signals, whether from measurements or simulations, are often non-stationary and rich in nonlinear features, demanding advanced processing techniques. We will introduce the wavelet transform (WT)and highlight its efficacy in providing time-frequency representations crucial for understanding transient behavior in nonlinear systems. The tutorial will also cover some signal decomposition methodologies including the wavelet-bounded empirical mode decomposition (WBEMD) for adaptive data-driven component separation and the inverse wavelet transform for targeted feature isolation. Furthermore, we will demonstrate how to use WBEMD for data-driven identification and characterization of nonlinear resonances between modes and components. Participants will gain insights into applying these tools to dissect vibrational responses, extract salient features, and better understand the intricate dynamics of nonlinear structures.

===Biography:===
Keegan J. Moore is an Associate Professor in Aerospace Engineering at the Georgia Institute of Technology where he leads the Moore Dynamics and Analytics Laboratory (MoDAL). He received his Ph.D. from the University of Illinois in 2018 and his B.Sc. from the University of Akron in 2014. He is an expert in nonlinear dynamics and vibrations and his research lies at intersection of theory, simulation, and measurements. His recent work focuses on novel system identification methods, non-reciprocity and energy guiding in nonlinear structures, the mechanics of loosening of bolts, autonomous vibration testing, and autonomous model updating. He is the recipient of the 2022 AFOSR Young Investigator Program Award and a 2023 NSF CAREER Award.

==Video Presentation ==
{{#widget:Youtube
|id =
| height = 444
| width = 790
}}

==Slides==
{{#widget:PDF
|url =https://drive.google.com/file/d/1Ts92qe52bkIMiWNb0-kMxyPynvqQDAfH/preview
|height = 400
|width = 720
}}

Links to Repository and Video Tutorials
[https://github.com/KeeganJMoore/MoDALToolbox|MoDAL Toolbox on GitHub]
[https://www.youtube.com/@modal6780|MoDAL YouTube Channel]
[https://www.youtube.com/watch?v=SnIOsVKzdaI&list=PLW7h3DNOAgFy88IaF5on76YDUoPq2Alaw|MoDAL Lecture Videos on Data-Driven Nonlinear Dynamics & Vibrations]

[[Category:Seminar_Series]]
[[Category:Overview]]
[[Category:Nonlinear System Identification]]
[[Category:Nonlinear Dynamics]]

Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals Moore July 2025

2025-07-08T16:36:01Z

Jadmin: /* Slides */

{{DISPLAYTITLE:Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals by Keegan Moore, July 2025}}
==Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals==

Keegan Moore

Professor, Georgia Institute of Technology

July 8, 2025

===Abstract:===

This tutorial addresses the challenges of analyzing complex signals from nonlinear mechanical structures undergoing vibrations. Such signals, whether from measurements or simulations, are often non-stationary and rich in nonlinear features, demanding advanced processing techniques. We will introduce the wavelet transform (WT)and highlight its efficacy in providing time-frequency representations crucial for understanding transient behavior in nonlinear systems. The tutorial will also cover some signal decomposition methodologies including the wavelet-bounded empirical mode decomposition (WBEMD) for adaptive data-driven component separation and the inverse wavelet transform for targeted feature isolation. Furthermore, we will demonstrate how to use WBEMD for data-driven identification and characterization of nonlinear resonances between modes and components. Participants will gain insights into applying these tools to dissect vibrational responses, extract salient features, and better understand the intricate dynamics of nonlinear structures.

===Biography:===
Keegan J. Moore is an Associate Professor in Aerospace Engineering at the Georgia Institute of Technology where he leads the Moore Dynamics and Analytics Laboratory (MoDAL). He received his Ph.D. from the University of Illinois in 2018 and his B.Sc. from the University of Akron in 2014. He is an expert in nonlinear dynamics and vibrations and his research lies at intersection of theory, simulation, and measurements. His recent work focuses on novel system identification methods, non-reciprocity and energy guiding in nonlinear structures, the mechanics of loosening of bolts, autonomous vibration testing, and autonomous model updating. He is the recipient of the 2022 AFOSR Young Investigator Program Award and a 2023 NSF CAREER Award.

==Video Presentation ==
{{#widget:Youtube
|id =
| height = 444
| width = 790
}}

==Slides==
{{#widget:PDF
|url =https://drive.google.com/file/d/1Ts92qe52bkIMiWNb0-kMxyPynvqQDAfH/preview
|height = 400
|width = 720
}}

[[Category:Seminar_Series]]
[[Category:Overview]]
[[Category:Nonlinear System Identification]]
[[Category:Nonlinear Dynamics]]

Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals Moore July 2025

2025-07-08T16:35:39Z

Jadmin:

{{DISPLAYTITLE:Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals by Keegan Moore, July 2025}}
==Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals==

Keegan Moore

Professor, Georgia Institute of Technology

July 8, 2025

===Abstract:===

This tutorial addresses the challenges of analyzing complex signals from nonlinear mechanical structures undergoing vibrations. Such signals, whether from measurements or simulations, are often non-stationary and rich in nonlinear features, demanding advanced processing techniques. We will introduce the wavelet transform (WT)and highlight its efficacy in providing time-frequency representations crucial for understanding transient behavior in nonlinear systems. The tutorial will also cover some signal decomposition methodologies including the wavelet-bounded empirical mode decomposition (WBEMD) for adaptive data-driven component separation and the inverse wavelet transform for targeted feature isolation. Furthermore, we will demonstrate how to use WBEMD for data-driven identification and characterization of nonlinear resonances between modes and components. Participants will gain insights into applying these tools to dissect vibrational responses, extract salient features, and better understand the intricate dynamics of nonlinear structures.

===Biography:===
Keegan J. Moore is an Associate Professor in Aerospace Engineering at the Georgia Institute of Technology where he leads the Moore Dynamics and Analytics Laboratory (MoDAL). He received his Ph.D. from the University of Illinois in 2018 and his B.Sc. from the University of Akron in 2014. He is an expert in nonlinear dynamics and vibrations and his research lies at intersection of theory, simulation, and measurements. His recent work focuses on novel system identification methods, non-reciprocity and energy guiding in nonlinear structures, the mechanics of loosening of bolts, autonomous vibration testing, and autonomous model updating. He is the recipient of the 2022 AFOSR Young Investigator Program Award and a 2023 NSF CAREER Award.

==Video Presentation ==
{{#widget:Youtube
|id =
| height = 444
| width = 790
}}

==Slides==
{{#widget:PDF
|url =https://drive.google.com/file/d/1Ts92qe52bkIMiWNb0-kMxyPynvqQDAfH/preview
|height = 200
|width = 720
}}

[[Category:Seminar_Series]]
[[Category:Overview]]
[[Category:Nonlinear System Identification]]
[[Category:Nonlinear Dynamics]]

Main Page

2025-07-08T13:58:24Z

Jadmin: /* Next Seminar Series */

__NOTOC__
{{DISPLAYTITLE: Committee on Joint Mechanics}}
= Welcome to the Committee on Joint Mechanics Webpage =

On this page, you can find

# Current and past [[Benchmarks|benchmark]] structures studied by the community
# [[Calendar|Calendar]] of events (Conferences, Due Dates, Seminars)
# [[:Category:Seminar_Series|Seminar]] Presentations and associated papers
# [[Research_Camps|Research Camps/ Institutes]] hosted by the community
# [[:Category:Job Postings|Job Postings]]
# [[:Category:Recent_Graduates|Recent Graduates]] in the community

=Summer Research Camp Recruiting=
Both summer research camps for our community are recruiting for this summer
# Tribomechadynamics Research Camp 2024 due March 15, 2024 [[TRC2024|More Information Here]]
# NOMAD 2024 due in Early March 2024 [[NOMAD2024|More Information Here]]

=Next Seminar Series=

Our Seminar Series will be TBD

The Schedule of talks can also be seen on the calendar for the local time zone.

For more information on our Seminar Series and a List at: [[:Category:Seminar_Series|List of all Hosted Seminars]]

Previous Introductory Seminars include:
# Understanding Jointed Interfaces Through [[Understanding_Jointed_interfaces_Through_Tribomechadynamics_Brake_Sept_2022|Tribomechadynamics]]
# Introduction to Structural [[Introduction_to_Structural_Dynamics_Matt_Allen_May112021|Dynamics]]
# Introduction to Nonlinear Normal [[Introduction_to_Nonlinear_Normal_Modes_Gaetan_Kerschen_June82021|Modes]]
# Introduction to Harmonic Balance and Continuation [[Introduction_to_Harmonic_Balance_and_Continuation_Methods_Loic_Salles_July202021|Methods]]
# Non-Contact Diagnostics in Structural [[NonContact_Diagnotics_in_Structural_Dynamics_Daniel_Rohe_April122022|Dynamics]]
# Nonlinear Modes of Jointed [[Nonlinear_Modes_of_Jointed_Structures_by_Malte_Krack_March_2023|Structures]]
# An Abaqus Matlab Tutorial for Jointed [[An_Abaqus_Matlab_Tutorial_for_Jointed_Systems_March_2025|Systems]]
# Understanding Jointed Interfaces Through [[Understanding_Jointed_interfaces_Through_Tribomechadynamics_Brake_Sept_2022|Tribomechadynamics]]
# Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear [[Tutorial:_Wavelet_Analysis_and_Signal_Decomposition_for_Nonlinear_Signals_Moore_July_2025|Signals]]

Previous Conferences:
# [[TMD2021|Tribomechadynamics]] Conference 2021
# [[TMD2023|Tribomechadynamics]] Conference 2023

Previous Research Camp Presentations
# [[TRC2022Presentations|Tribomechadynamics]] Research Camp 2022 Final Presentations

Committee Minutes
#IMAC 2022 [[IMAC2022Minutes|Minutes]]

=Upcoming Events=
See the calendar for all upcoming events and dates.

==Tribomechadynamics 2025==
I'm pleased to announce that Tribomechadynamics 2025 will be hosted at the University of Stuttgart from August 25-27. This conference is held every other year in conjunction with our Tribomechadynamics Research Camp. As usual, there will be four tracks: nonlinear/structural dynamics, contact mechanics, tribology, and the integration of these three topics into Tribomechadynamics.

I'm also pleased to announce our three keynote speakers:

Alice Cicirello, University of Cambridge

David Nowell, Imperial College London

Pascal Reuß, Mercedes-Benz AG

We will be posting more information soon, but please feel free to visit our website in the meantime:

http://tmd.rice.edu/tribomechadynamics-2025/

Key dates for the conference are:
#Abstracts due May 1st, 2025
#Acceptance notification by May 15th, 2025
#Full Papers due August 1st, 2025 (student paper competition submissions)
#Extended Abstracts due August 15th, 2025 (non-student paper competition submissions)
#Registration deadline (for the advanced registration rate) is August 18th, 2025
#Conference dates are August 25th through 27th, 2025.

Lastly, for those of you traveling from overseas, the conference has been timed such that you can also attend the International Conference on Experimental Continuation in Nonlinear Dynamics (XCON), hosted by Ghislain Raze and Gaetan Kerschen in Liege, Belgium from August 28-29. Their website is http://www.s3l.be/en/xcon.

Please feel free to reach out to us if you have any questions,

Matthew Brake, Christoph Schwingshackl, and Malte Krack

=Calendar=

To add an event to the calendar please email us at: [mailto:joints.committee+events@gmail.com Joints Committee Gmail]

{{#widget:Google Calendar
|id=ptjdmbb9qjj6fvm8mmclif3kig@group.calendar.google.com
|color=2952A3
|height = 600
|width = 50%
|showtz
|view = agenda
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Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals Moore July 2025

2025-07-08T13:57:50Z

Jadmin:

{{DISPLAYTITLE:Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals by Keegan Moore, July 2025}}
==Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals==

Keegan Moore

Professor, Georgia Institute of Technology

July 8, 2025

===Abstract:===

This tutorial addresses the challenges of analyzing complex signals from nonlinear mechanical structures undergoing vibrations. Such signals, whether from measurements or simulations, are often non-stationary and rich in nonlinear features, demanding advanced processing techniques. We will introduce the wavelet transform (WT)and highlight its efficacy in providing time-frequency representations crucial for understanding transient behavior in nonlinear systems. The tutorial will also cover some signal decomposition methodologies including the wavelet-bounded empirical mode decomposition (WBEMD) for adaptive data-driven component separation and the inverse wavelet transform for targeted feature isolation. Furthermore, we will demonstrate how to use WBEMD for data-driven identification and characterization of nonlinear resonances between modes and components. Participants will gain insights into applying these tools to dissect vibrational responses, extract salient features, and better understand the intricate dynamics of nonlinear structures.

===Biography:===
Keegan J. Moore is an Associate Professor in Aerospace Engineering at the Georgia Institute of Technology where he leads the Moore Dynamics and Analytics Laboratory (MoDAL). He received his Ph.D. from the University of Illinois in 2018 and his B.Sc. from the University of Akron in 2014. He is an expert in nonlinear dynamics and vibrations and his research lies at intersection of theory, simulation, and measurements. His recent work focuses on novel system identification methods, non-reciprocity and energy guiding in nonlinear structures, the mechanics of loosening of bolts, autonomous vibration testing, and autonomous model updating. He is the recipient of the 2022 AFOSR Young Investigator Program Award and a 2023 NSF CAREER Award.

==Video Presentation ==
{{#widget:Youtube
|id =
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Overview]]
[[Category:Nonlinear System Identification]]
[[Category:Nonlinear Dynamics]]

Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals Moore July 2025

2025-07-08T13:56:52Z

Jadmin: Created page with "{{DISPLAYTITLE:Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals by Keegan Moore, July 2025}} ==Understanding Jointed Interfaces Through Tribomechadynamics== Keegan Moore Professor, Georgia Institute of Technology July 8, 2025 ===Abstract:=== This tutorial addresses the challenges of analyzing complex signals from nonlinear mechanical structures undergoing vibrations. Such signals, whether from measurements or simulations, are often non-stati..."

{{DISPLAYTITLE:Tutorial: Wavelet Analysis and Signal Decomposition for Nonlinear Signals by Keegan Moore, July 2025}}
==Understanding Jointed Interfaces Through Tribomechadynamics==

Keegan Moore

Professor, Georgia Institute of Technology

July 8, 2025

===Abstract:===

This tutorial addresses the challenges of analyzing complex signals from nonlinear mechanical structures undergoing vibrations. Such signals, whether from measurements or simulations, are often non-stationary and rich in nonlinear features, demanding advanced processing techniques. We will introduce the wavelet transform (WT)and highlight its efficacy in providing time-frequency representations crucial for understanding transient behavior in nonlinear systems. The tutorial will also cover some signal decomposition methodologies including the wavelet-bounded empirical mode decomposition (WBEMD) for adaptive data-driven component separation and the inverse wavelet transform for targeted feature isolation. Furthermore, we will demonstrate how to use WBEMD for data-driven identification and characterization of nonlinear resonances between modes and components. Participants will gain insights into applying these tools to dissect vibrational responses, extract salient features, and better understand the intricate dynamics of nonlinear structures.

===Biography:===
Keegan J. Moore is an Associate Professor in Aerospace Engineering at the Georgia Institute of Technology where he leads the Moore Dynamics and Analytics Laboratory (MoDAL). He received his Ph.D. from the University of Illinois in 2018 and his B.Sc. from the University of Akron in 2014. He is an expert in nonlinear dynamics and vibrations and his research lies at intersection of theory, simulation, and measurements. His recent work focuses on novel system identification methods, non-reciprocity and energy guiding in nonlinear structures, the mechanics of loosening of bolts, autonomous vibration testing, and autonomous model updating. He is the recipient of the 2022 AFOSR Young Investigator Program Award and a 2023 NSF CAREER Award.

==Video Presentation ==
{{#widget:Youtube
|id =
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Overview]]
[[Category:Nonlinear System Identification]]
[[Category:Nonlinear Dynamics]]

Main Page

2025-05-29T12:26:01Z

Jadmin: /* Next Seminar Series */

__NOTOC__
{{DISPLAYTITLE: Committee on Joint Mechanics}}
= Welcome to the Committee on Joint Mechanics Webpage =

On this page, you can find

# Current and past [[Benchmarks|benchmark]] structures studied by the community
# [[Calendar|Calendar]] of events (Conferences, Due Dates, Seminars)
# [[:Category:Seminar_Series|Seminar]] Presentations and associated papers
# [[Research_Camps|Research Camps/ Institutes]] hosted by the community
# [[:Category:Job Postings|Job Postings]]
# [[:Category:Recent_Graduates|Recent Graduates]] in the community

=Summer Research Camp Recruiting=
Both summer research camps for our community are recruiting for this summer
# Tribomechadynamics Research Camp 2024 due March 15, 2024 [[TRC2024|More Information Here]]
# NOMAD 2024 due in Early March 2024 [[NOMAD2024|More Information Here]]

=Next Seminar Series=

Our Seminar Series will be TBD

The Schedule of talks can also be seen on the calendar for the local time zone.

For more information on our Seminar Series and a List at: [[:Category:Seminar_Series|List of all Hosted Seminars]]

Previous Introductory Seminars include:
# Understanding Jointed Interfaces Through [[Understanding_Jointed_interfaces_Through_Tribomechadynamics_Brake_Sept_2022|Tribomechadynamics]]
# Introduction to Structural [[Introduction_to_Structural_Dynamics_Matt_Allen_May112021|Dynamics]]
# Introduction to Nonlinear Normal [[Introduction_to_Nonlinear_Normal_Modes_Gaetan_Kerschen_June82021|Modes]]
# Introduction to Harmonic Balance and Continuation [[Introduction_to_Harmonic_Balance_and_Continuation_Methods_Loic_Salles_July202021|Methods]]
# Non-Contact Diagnostics in Structural [[NonContact_Diagnotics_in_Structural_Dynamics_Daniel_Rohe_April122022|Dynamics]]
# Nonlinear Modes of Jointed [[Nonlinear_Modes_of_Jointed_Structures_by_Malte_Krack_March_2023|Structures]]
# An Abaqus Matlab Tutorial for Jointed [[An_Abaqus_Matlab_Tutorial_for_Jointed_Systems_March_2025|Systems]]

Previous Conferences:
# [[TMD2021|Tribomechadynamics]] Conference 2021
# [[TMD2023|Tribomechadynamics]] Conference 2023

Previous Research Camp Presentations
# [[TRC2022Presentations|Tribomechadynamics]] Research Camp 2022 Final Presentations

Committee Minutes
#IMAC 2022 [[IMAC2022Minutes|Minutes]]

=Upcoming Events=
See the calendar for all upcoming events and dates.

==Tribomechadynamics 2025==
I'm pleased to announce that Tribomechadynamics 2025 will be hosted at the University of Stuttgart from August 25-27. This conference is held every other year in conjunction with our Tribomechadynamics Research Camp. As usual, there will be four tracks: nonlinear/structural dynamics, contact mechanics, tribology, and the integration of these three topics into Tribomechadynamics.

I'm also pleased to announce our three keynote speakers:

Alice Cicirello, University of Cambridge

David Nowell, Imperial College London

Pascal Reuß, Mercedes-Benz AG

We will be posting more information soon, but please feel free to visit our website in the meantime:

http://tmd.rice.edu/tribomechadynamics-2025/

Key dates for the conference are:
#Abstracts due May 1st, 2025
#Acceptance notification by May 15th, 2025
#Full Papers due August 1st, 2025 (student paper competition submissions)
#Extended Abstracts due August 15th, 2025 (non-student paper competition submissions)
#Registration deadline (for the advanced registration rate) is August 18th, 2025
#Conference dates are August 25th through 27th, 2025.

Lastly, for those of you traveling from overseas, the conference has been timed such that you can also attend the International Conference on Experimental Continuation in Nonlinear Dynamics (XCON), hosted by Ghislain Raze and Gaetan Kerschen in Liege, Belgium from August 28-29. Their website is http://www.s3l.be/en/xcon.

Please feel free to reach out to us if you have any questions,

Matthew Brake, Christoph Schwingshackl, and Malte Krack

=Calendar=

To add an event to the calendar please email us at: [mailto:joints.committee+events@gmail.com Joints Committee Gmail]

{{#widget:Google Calendar
|id=ptjdmbb9qjj6fvm8mmclif3kig@group.calendar.google.com
|color=2952A3
|height = 600
|width = 50%
|showtz
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What does a number mean: a summary of uncertainty quantification methods in engineering Matt Bonney May 2025

2025-05-29T12:24:17Z

Jadmin: Created page with "{{DISPLAYTITLE:What does a number mean: a summary of uncertainty quantification methods in engineering by Dr. Matt Bonney, May. 20, 2025}} ==What does a number mean: a summary of uncertainty quantification methods in engineering== Dr. Matt Bonney Swansea University, Wales, UK May 20, 2025 ===Abstract:=== When engineers communicate, despite any language barriers, there is always numbers. These numbers allow us to quantify designs, costs, and ideas. However, the use..."

{{DISPLAYTITLE:What does a number mean: a summary of uncertainty quantification methods in engineering by Dr. Matt Bonney, May. 20, 2025}}
==What does a number mean: a summary of uncertainty quantification methods in engineering==

Dr. Matt Bonney

Swansea University, Wales, UK

May 20, 2025

===Abstract:===
When engineers communicate, despite any language barriers, there is always numbers.
These numbers allow us to quantify designs, costs, and ideas. However, the use of numbers
can be very tricky due to the natural order. When a number is presented, there is always a
necessary context to that number. This context can include aspects of metadata, such as
units, locations, etc. or quantifiable context, such as non-real components, stochastic
distribution, or tolerance. This holistic context is highly important for decision making and risk
management. To better understand this context, this talk presents a summary of various
techniques/approaches for uncertainty quantification and the understanding of numbers in
the engineering context.

===Biography:===
Dr. Matt Bonney is a lecturer (assistant professor equivalent) in Space Engineering at
Swansea University in Wales, UK. His speciality lies in the holistic modelling and
understanding of complex engineering systems. This has led to his research in Uncertainty
Quantification, Digital Twins, Multiphysics modelling, and joint mechanics. This includes the
development of fundamental mathematics called Hyper-Dual Numbers and development of
Human-Computer interfaces with DTOP-Cristallo. He received his Ph.D. in Engineering
Mechanics from the University of Wisconsin-Madison under Professor Dan Kammer and was
a participating member to the predecessor of the NOMAD and TRC research camps.

==Video Presentation ==

{{#widget:Youtube
|id =zUu5F94PhGM
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Finite_Element_Analysis]]
[[Category:Simulation_Methods]]
[[Category:Overview]]

April 2025 Wolfgang Witteveen Tutorial Efficient and accurate time integration of FE models with small sliding contact using 3DS software Abaqus and Simpack

2025-05-01T19:21:50Z

Jadmin: /* Video Presentation */

{{DISPLAYTITLE:Tutorial: Efficient and accurate time integration of FE models with small sliding contact using 3DS software Abaqus and Simpack by Prof. Wolfgang Witteveen, Apr. 23, 2025}}
==Tutorial: Efficient and accurate time integration of FE models with small sliding contact using 3DS software Abaqus and Simpack==

Prof. Wolfgang Witteveen

University of Applied Sciences Upper Austria

April 23, 2025

===Abstract:===
Tribomechadynamics is very challenging in terms of simulation. A fine FE mesh is generally required for joints of arbitrary shape and details (like bores). Precise results with regard to contact and friction forces are only possible if the contact is resolved locally (e.g. node to surface). These requirements mean that transient simulations cannot be done efficiently using numerical time integration in the context of FEM. Model reduction provides an alternative. Known mode bases, such as Craig and Bampton, are extended with so-called contact modes. These trial vectors specifically extend the reduced model with flexibility in the area of the joint. This enables fast computations with fine meshes, non-linear contact and friction force laws, taking into account vibrations and rigid body dynamics. The method is implemented and available in the 3DS products Abaqus and Simpack. This presentation is a tutorial on how to use these tools. It will show how to compute the contact modes and how to perform the time integration.

===Biography:===
The author is professor for “Simulation in Mechanical Engineering” at the University of Applied Sciences Upper Austria. He has been working on the efficient consideration of small sliding contacts in numerical time integration for around 20 years. About 3 years ago, 3DS became aware of the technology and a development partnership was formed

==Video Presentation ==

{{#widget:Youtube
|id =ofD536ht88g
| height = 444
| width = 790
}}

==Slides==
{{#widget:PDF
|url =https://drive.google.com/file/d/1cg5HyOK6oEUNDwv8QAmPDcf4HeYm3xh2/preview
|hieght = 200
|width = 720
}}

[[Category:Seminar_Series]]
[[Category:Finite_Element_Analysis]]
[[Category:Simulation_Methods]]
[[Category:Overview]]

April 2025 Wolfgang Witteveen Tutorial Efficient and accurate time integration of FE models with small sliding contact using 3DS software Abaqus and Simpack

2025-04-16T13:46:09Z

Jadmin: /* Slides */

{{DISPLAYTITLE:Tutorial: Efficient and accurate time integration of FE models with small sliding contact using 3DS software Abaqus and Simpack by Prof. Wolfgang Witteveen, Apr. 23, 2025}}
==Tutorial: Efficient and accurate time integration of FE models with small sliding contact using 3DS software Abaqus and Simpack==

Prof. Wolfgang Witteveen

University of Applied Sciences Upper Austria

April 23, 2025

===Abstract:===
Tribomechadynamics is very challenging in terms of simulation. A fine FE mesh is generally required for joints of arbitrary shape and details (like bores). Precise results with regard to contact and friction forces are only possible if the contact is resolved locally (e.g. node to surface). These requirements mean that transient simulations cannot be done efficiently using numerical time integration in the context of FEM. Model reduction provides an alternative. Known mode bases, such as Craig and Bampton, are extended with so-called contact modes. These trial vectors specifically extend the reduced model with flexibility in the area of the joint. This enables fast computations with fine meshes, non-linear contact and friction force laws, taking into account vibrations and rigid body dynamics. The method is implemented and available in the 3DS products Abaqus and Simpack. This presentation is a tutorial on how to use these tools. It will show how to compute the contact modes and how to perform the time integration.

===Biography:===
The author is professor for “Simulation in Mechanical Engineering” at the University of Applied Sciences Upper Austria. He has been working on the efficient consideration of small sliding contacts in numerical time integration for around 20 years. About 3 years ago, 3DS became aware of the technology and a development partnership was formed

==Video Presentation ==

{{#widget:Youtube
|id =
| height = 444
| width = 790
}}

==Slides==
{{#widget:PDF
|url =https://drive.google.com/file/d/1cg5HyOK6oEUNDwv8QAmPDcf4HeYm3xh2/preview
|hieght = 200
|width = 720
}}

[[Category:Seminar_Series]]
[[Category:Finite_Element_Analysis]]
[[Category:Simulation_Methods]]
[[Category:Overview]]

April 2025 Wolfgang Witteveen Tutorial Efficient and accurate time integration of FE models with small sliding contact using 3DS software Abaqus and Simpack

2025-04-16T13:45:36Z

Jadmin: Created page with "{{DISPLAYTITLE:Tutorial: Efficient and accurate time integration of FE models with small sliding contact using 3DS software Abaqus and Simpack by Prof. Wolfgang Witteveen, Apr. 23, 2025}} ==Tutorial: Efficient and accurate time integration of FE models with small sliding contact using 3DS software Abaqus and Simpack== Prof. Wolfgang Witteveen University of Applied Sciences Upper Austria April 23, 2025 ===Abstract:=== Tribomechadynamics is very challenging in terms..."

{{DISPLAYTITLE:Tutorial: Efficient and accurate time integration of FE models with small sliding contact using 3DS software Abaqus and Simpack by Prof. Wolfgang Witteveen, Apr. 23, 2025}}
==Tutorial: Efficient and accurate time integration of FE models with small sliding contact using 3DS software Abaqus and Simpack==

Prof. Wolfgang Witteveen

University of Applied Sciences Upper Austria

April 23, 2025

===Abstract:===
Tribomechadynamics is very challenging in terms of simulation. A fine FE mesh is generally required for joints of arbitrary shape and details (like bores). Precise results with regard to contact and friction forces are only possible if the contact is resolved locally (e.g. node to surface). These requirements mean that transient simulations cannot be done efficiently using numerical time integration in the context of FEM. Model reduction provides an alternative. Known mode bases, such as Craig and Bampton, are extended with so-called contact modes. These trial vectors specifically extend the reduced model with flexibility in the area of the joint. This enables fast computations with fine meshes, non-linear contact and friction force laws, taking into account vibrations and rigid body dynamics. The method is implemented and available in the 3DS products Abaqus and Simpack. This presentation is a tutorial on how to use these tools. It will show how to compute the contact modes and how to perform the time integration.

===Biography:===
The author is professor for “Simulation in Mechanical Engineering” at the University of Applied Sciences Upper Austria. He has been working on the efficient consideration of small sliding contacts in numerical time integration for around 20 years. About 3 years ago, 3DS became aware of the technology and a development partnership was formed

==Video Presentation ==

{{#widget:Youtube
|id =
| height = 444
| width = 790
}}

==Slides==
{{#widget:PDF
|url =https://drive.google.com/file/d/1JbYX-O7DTfQ2QTvz5TDafztKzupiFfcP/preview
|hieght = 200
|width = 720
}}

[[Category:Seminar_Series]]
[[Category:Finite_Element_Analysis]]
[[Category:Simulation_Methods]]
[[Category:Overview]]

Main Page

2025-04-16T13:41:00Z

Jadmin: /* Next Seminar Series */

__NOTOC__
{{DISPLAYTITLE: Committee on Joint Mechanics}}
= Welcome to the Committee on Joint Mechanics Webpage =

On this page, you can find

# Current and past [[Benchmarks|benchmark]] structures studied by the community
# [[Calendar|Calendar]] of events (Conferences, Due Dates, Seminars)
# [[:Category:Seminar_Series|Seminar]] Presentations and associated papers
# [[Research_Camps|Research Camps/ Institutes]] hosted by the community
# [[:Category:Job Postings|Job Postings]]
# [[:Category:Recent_Graduates|Recent Graduates]] in the community

=Summer Research Camp Recruiting=
Both summer research camps for our community are recruiting for this summer
# Tribomechadynamics Research Camp 2024 due March 15, 2024 [[TRC2024|More Information Here]]
# NOMAD 2024 due in Early March 2024 [[NOMAD2024|More Information Here]]

=Next Seminar Series=

Our Seminar Series will be April 23, by Prof. Wolfgang Witteveen on Tutorial: Efficient and accurate time integration of FE models with small sliding contact using 3DS software Abaqus and Simpack. [[April_2025_Wolfgang_Witteveen_Tutorial_Efficient_and_accurate_time_integration_of_FE_models_with_small_sliding_contact_using_3DS_software_Abaqus_and_Simpack|More Information Here]]

The Schedule of talks can also be seen on the calendar for the local time zone.

For more information on our Seminar Series and a List at: [[:Category:Seminar_Series|List of all Hosted Seminars]]

Previous Introductory Seminars include:
# Understanding Jointed Interfaces Through [[Understanding_Jointed_interfaces_Through_Tribomechadynamics_Brake_Sept_2022|Tribomechadynamics]]
# Introduction to Structural [[Introduction_to_Structural_Dynamics_Matt_Allen_May112021|Dynamics]]
# Introduction to Nonlinear Normal [[Introduction_to_Nonlinear_Normal_Modes_Gaetan_Kerschen_June82021|Modes]]
# Introduction to Harmonic Balance and Continuation [[Introduction_to_Harmonic_Balance_and_Continuation_Methods_Loic_Salles_July202021|Methods]]
# Non-Contact Diagnostics in Structural [[NonContact_Diagnotics_in_Structural_Dynamics_Daniel_Rohe_April122022|Dynamics]]
# Nonlinear Modes of Jointed [[Nonlinear_Modes_of_Jointed_Structures_by_Malte_Krack_March_2023|Structures]]
# An Abaqus Matlab Tutorial for Jointed [[An_Abaqus_Matlab_Tutorial_for_Jointed_Systems_March_2025|Systems]]

Previous Conferences:
# [[TMD2021|Tribomechadynamics]] Conference 2021
# [[TMD2023|Tribomechadynamics]] Conference 2023

Previous Research Camp Presentations
# [[TRC2022Presentations|Tribomechadynamics]] Research Camp 2022 Final Presentations

Committee Minutes
#IMAC 2022 [[IMAC2022Minutes|Minutes]]

=Upcoming Events=
See the calendar for all upcoming events and dates.

==Tribomechadynamics 2025==
I'm pleased to announce that Tribomechadynamics 2025 will be hosted at the University of Stuttgart from August 25-27. This conference is held every other year in conjunction with our Tribomechadynamics Research Camp. As usual, there will be four tracks: nonlinear/structural dynamics, contact mechanics, tribology, and the integration of these three topics into Tribomechadynamics.

I'm also pleased to announce our three keynote speakers:

Alice Cicirello, University of Cambridge

David Nowell, Imperial College London

Pascal Reuß, Mercedes-Benz AG

We will be posting more information soon, but please feel free to visit our website in the meantime:

http://tmd.rice.edu/tribomechadynamics-2025/

Key dates for the conference are:
#Abstracts due May 1st, 2025
#Acceptance notification by May 15th, 2025
#Full Papers due August 1st, 2025 (student paper competition submissions)
#Extended Abstracts due August 15th, 2025 (non-student paper competition submissions)
#Registration deadline (for the advanced registration rate) is August 18th, 2025
#Conference dates are August 25th through 27th, 2025.

Lastly, for those of you traveling from overseas, the conference has been timed such that you can also attend the International Conference on Experimental Continuation in Nonlinear Dynamics (XCON), hosted by Ghislain Raze and Gaetan Kerschen in Liege, Belgium from August 28-29. Their website is http://www.s3l.be/en/xcon.

Please feel free to reach out to us if you have any questions,

Matthew Brake, Christoph Schwingshackl, and Malte Krack

=Calendar=

To add an event to the calendar please email us at: [mailto:joints.committee+events@gmail.com Joints Committee Gmail]

{{#widget:Google Calendar
|id=ptjdmbb9qjj6fvm8mmclif3kig@group.calendar.google.com
|color=2952A3
|height = 600
|width = 50%
|showtz
|view = agenda
}}

An Abaqus Matlab Tutorial for Jointed Systems March 2025

2025-04-09T17:13:11Z

Jadmin: /* Slides */

{{DISPLAYTITLE:An Abaqus-Matlab Tutorial for Jointed Systems by Dr. Nidish Balaji, Mar. 26, 2025}}
==An Abaqus-Matlab Tutorial for Jointed Systems==

Dr. Nidish Balaji

Indian Institute of Technology Madras, Chennai

March 26, 2025

===Abstract:===
The seminar will serve as a tutorial for modeling jointed systems through Abaqus and Matlab. The application will be restricted to small deformation problems, justifying many of the simplifications that will be done in the process. The topics that will be covered in the tutorial include Python scripting for automating the process of pre-processing in Abaqus, mesh generation and processing in Abaqus, substructured matrix extraction, and nonlinear contact analysis in MATLAB. Some practical details such as fixing geometrical inexactness, bolt-load vector extraction, relative displacement coordinates, etc. will be covered. One highlight of the tutorial is that it will be shown that non-linear analysis can be carried out in sub 100 lines of MATLAB code using the extracted matrices & vectors. Basic ideas of traction-based contact modeling with zero-thickness elements will also be introduced. The codes are also compatible with GNU Octave.

All the material for the seminar are available through this web page: https://nidish96.github.io/Abaqus4Joints/
Software requirements: Abaqus (any recent version works), Matlab (any recent version) or GNU Octave, WSL (Windows Subsystem for Linux) if on Windows.

===Biography:===
Currently an Assistant Professor in the Aerospace Engineering Department at Indian Institute of Technology Madras, Chennai (IIT Madras, 2024-). His research revolves around vibrations, nonlinear structural dynamics, frictional oscillations, modal testing, etc. Prior to this, he was a Humboldt postdoctoral researcher at the University of Stuttgart, hosted by Prof. Malte Krack (2022-2024); and a postdoctoral researcher at Rice University in Prof. Matthew R. W. Brake's group (2021-2022) . He received his MS & PhD degrees in Mechanical Engineering from Rice University (2019, 2021, Advisor: Prof. Matthew R. W. Brake) and B.Tech. degree in Aerospace Engineering from the Indian Institute of Space science & Technology (IIST) Thiruvananthapuram (2017).

==Video Presentation ==

{{#widget:Youtube
|id =TgvqzTULOag
| height = 444
| width = 790
}}

==Slides==
{{#widget:PDF
|url =https://drive.google.com/file/d/1Y0IdpKIVu-d96RJ1wOC3zzUOeOEhHmzX//preview
|hieght = 200
|width = 720
}}

[[Category:Seminar_Series]]
[[Category:Finite_Element_Analysis]]
[[Category:Simulation_Methods]]
[[Category:Overview]]

An Abaqus Matlab Tutorial for Jointed Systems March 2025

2025-04-09T17:12:07Z

Jadmin:

{{DISPLAYTITLE:An Abaqus-Matlab Tutorial for Jointed Systems by Dr. Nidish Balaji, Mar. 26, 2025}}
==An Abaqus-Matlab Tutorial for Jointed Systems==

Dr. Nidish Balaji

Indian Institute of Technology Madras, Chennai

March 26, 2025

===Abstract:===
The seminar will serve as a tutorial for modeling jointed systems through Abaqus and Matlab. The application will be restricted to small deformation problems, justifying many of the simplifications that will be done in the process. The topics that will be covered in the tutorial include Python scripting for automating the process of pre-processing in Abaqus, mesh generation and processing in Abaqus, substructured matrix extraction, and nonlinear contact analysis in MATLAB. Some practical details such as fixing geometrical inexactness, bolt-load vector extraction, relative displacement coordinates, etc. will be covered. One highlight of the tutorial is that it will be shown that non-linear analysis can be carried out in sub 100 lines of MATLAB code using the extracted matrices & vectors. Basic ideas of traction-based contact modeling with zero-thickness elements will also be introduced. The codes are also compatible with GNU Octave.

All the material for the seminar are available through this web page: https://nidish96.github.io/Abaqus4Joints/
Software requirements: Abaqus (any recent version works), Matlab (any recent version) or GNU Octave, WSL (Windows Subsystem for Linux) if on Windows.

===Biography:===
Currently an Assistant Professor in the Aerospace Engineering Department at Indian Institute of Technology Madras, Chennai (IIT Madras, 2024-). His research revolves around vibrations, nonlinear structural dynamics, frictional oscillations, modal testing, etc. Prior to this, he was a Humboldt postdoctoral researcher at the University of Stuttgart, hosted by Prof. Malte Krack (2022-2024); and a postdoctoral researcher at Rice University in Prof. Matthew R. W. Brake's group (2021-2022) . He received his MS & PhD degrees in Mechanical Engineering from Rice University (2019, 2021, Advisor: Prof. Matthew R. W. Brake) and B.Tech. degree in Aerospace Engineering from the Indian Institute of Space science & Technology (IIST) Thiruvananthapuram (2017).

==Video Presentation ==

{{#widget:Youtube
|id =TgvqzTULOag
| height = 444
| width = 790
}}

==Slides==
{{#widget:PDF
|url =https://drive.google.com/file/d/1Y0IdpKIVu-d96RJ1wOC3zzUOeOEhHmzX
|hieght = 200
|width = 720
}}

[[Category:Seminar_Series]]
[[Category:Finite_Element_Analysis]]
[[Category:Simulation_Methods]]
[[Category:Overview]]

Main Page

2025-04-09T17:08:02Z

Jadmin: /* Next Seminar Series */

__NOTOC__
{{DISPLAYTITLE: Committee on Joint Mechanics}}
= Welcome to the Committee on Joint Mechanics Webpage =

On this page, you can find

# Current and past [[Benchmarks|benchmark]] structures studied by the community
# [[Calendar|Calendar]] of events (Conferences, Due Dates, Seminars)
# [[:Category:Seminar_Series|Seminar]] Presentations and associated papers
# [[Research_Camps|Research Camps/ Institutes]] hosted by the community
# [[:Category:Job Postings|Job Postings]]
# [[:Category:Recent_Graduates|Recent Graduates]] in the community

=Summer Research Camp Recruiting=
Both summer research camps for our community are recruiting for this summer
# Tribomechadynamics Research Camp 2024 due March 15, 2024 [[TRC2024|More Information Here]]
# NOMAD 2024 due in Early March 2024 [[NOMAD2024|More Information Here]]

=Next Seminar Series=

Our Seminar Series will be in Janurary

Most recent December 17, 2024 by Svenja Hermann on Beyond Band Gaps: Modeling Mechanical Metamaterials for Engineering Applications. More information [[Beyond Band Gaps: Modeling Mechanical Metamaterials for Engineering Applications Dec 2024|here]].

The Schedule of talks can also be seen on the calendar for the local time zone.

For more information on our Seminar Series and a List at: [[:Category:Seminar_Series|List of all Hosted Seminars]]

Previous Introductory Seminars include:
# Understanding Jointed Interfaces Through [[Understanding_Jointed_interfaces_Through_Tribomechadynamics_Brake_Sept_2022|Tribomechadynamics]]
# Introduction to Structural [[Introduction_to_Structural_Dynamics_Matt_Allen_May112021|Dynamics]]
# Introduction to Nonlinear Normal [[Introduction_to_Nonlinear_Normal_Modes_Gaetan_Kerschen_June82021|Modes]]
# Introduction to Harmonic Balance and Continuation [[Introduction_to_Harmonic_Balance_and_Continuation_Methods_Loic_Salles_July202021|Methods]]
# Non-Contact Diagnostics in Structural [[NonContact_Diagnotics_in_Structural_Dynamics_Daniel_Rohe_April122022|Dynamics]]
# Nonlinear Modes of Jointed [[Nonlinear_Modes_of_Jointed_Structures_by_Malte_Krack_March_2023|Structures]]
# An Abaqus Matlab Tutorial for Jointed [[An_Abaqus_Matlab_Tutorial_for_Jointed_Systems_March_2025|Systems]]

Previous Conferences:
# [[TMD2021|Tribomechadynamics]] Conference 2021
# [[TMD2023|Tribomechadynamics]] Conference 2023

Previous Research Camp Presentations
# [[TRC2022Presentations|Tribomechadynamics]] Research Camp 2022 Final Presentations

Committee Minutes
#IMAC 2022 [[IMAC2022Minutes|Minutes]]

=Upcoming Events=
See the calendar for all upcoming events and dates.

==Tribomechadynamics 2025==
I'm pleased to announce that Tribomechadynamics 2025 will be hosted at the University of Stuttgart from August 25-27. This conference is held every other year in conjunction with our Tribomechadynamics Research Camp. As usual, there will be four tracks: nonlinear/structural dynamics, contact mechanics, tribology, and the integration of these three topics into Tribomechadynamics.

I'm also pleased to announce our three keynote speakers:

Alice Cicirello, University of Cambridge

David Nowell, Imperial College London

Pascal Reuß, Mercedes-Benz AG

We will be posting more information soon, but please feel free to visit our website in the meantime:

http://tmd.rice.edu/tribomechadynamics-2025/

Key dates for the conference are:
#Abstracts due May 1st, 2025
#Acceptance notification by May 15th, 2025
#Full Papers due August 1st, 2025 (student paper competition submissions)
#Extended Abstracts due August 15th, 2025 (non-student paper competition submissions)
#Registration deadline (for the advanced registration rate) is August 18th, 2025
#Conference dates are August 25th through 27th, 2025.

Lastly, for those of you traveling from overseas, the conference has been timed such that you can also attend the International Conference on Experimental Continuation in Nonlinear Dynamics (XCON), hosted by Ghislain Raze and Gaetan Kerschen in Liege, Belgium from August 28-29. Their website is http://www.s3l.be/en/xcon.

Please feel free to reach out to us if you have any questions,

Matthew Brake, Christoph Schwingshackl, and Malte Krack

=Calendar=

To add an event to the calendar please email us at: [mailto:joints.committee+events@gmail.com Joints Committee Gmail]

{{#widget:Google Calendar
|id=ptjdmbb9qjj6fvm8mmclif3kig@group.calendar.google.com
|color=2952A3
|height = 600
|width = 50%
|showtz
|view = agenda
}}

An Abaqus Matlab Tutorial for Jointed Systems March 2025

2025-04-09T17:07:03Z

Jadmin: Created page with "{{DISPLAYTITLE:An Abaqus-Matlab Tutorial for Jointed Systems by Dr. Nidish Balaji, Mar. 26, 2025}} ==An Abaqus-Matlab Tutorial for Jointed Systems== Dr. Nidish Balaji Indian Institute of Technology Madras, Chennai March 26, 2025 ===Abstract:=== The seminar will serve as a tutorial for modeling jointed systems through Abaqus and Matlab. The application will be restricted to small deformation problems, justifying many of the simplifications that will be done in the p..."

{{DISPLAYTITLE:An Abaqus-Matlab Tutorial for Jointed Systems by Dr. Nidish Balaji, Mar. 26, 2025}}
==An Abaqus-Matlab Tutorial for Jointed Systems==

Dr. Nidish Balaji

Indian Institute of Technology Madras, Chennai

March 26, 2025

===Abstract:===
The seminar will serve as a tutorial for modeling jointed systems through Abaqus and Matlab. The application will be restricted to small deformation problems, justifying many of the simplifications that will be done in the process. The topics that will be covered in the tutorial include Python scripting for automating the process of pre-processing in Abaqus, mesh generation and processing in Abaqus, substructured matrix extraction, and nonlinear contact analysis in MATLAB. Some practical details such as fixing geometrical inexactness, bolt-load vector extraction, relative displacement coordinates, etc. will be covered. One highlight of the tutorial is that it will be shown that non-linear analysis can be carried out in sub 100 lines of MATLAB code using the extracted matrices & vectors. Basic ideas of traction-based contact modeling with zero-thickness elements will also be introduced. The codes are also compatible with GNU Octave.

All the material for the seminar are available through this web page: https://nidish96.github.io/Abaqus4Joints/
Software requirements: Abaqus (any recent version works), Matlab (any recent version) or GNU Octave, WSL (Windows Subsystem for Linux) if on Windows.

===Biography:===
Currently an Assistant Professor in the Aerospace Engineering Department at Indian Institute of Technology Madras, Chennai (IIT Madras, 2024-). His research revolves around vibrations, nonlinear structural dynamics, frictional oscillations, modal testing, etc. Prior to this, he was a Humboldt postdoctoral researcher at the University of Stuttgart, hosted by Prof. Malte Krack (2022-2024); and a postdoctoral researcher at Rice University in Prof. Matthew R. W. Brake's group (2021-2022) . He received his MS & PhD degrees in Mechanical Engineering from Rice University (2019, 2021, Advisor: Prof. Matthew R. W. Brake) and B.Tech. degree in Aerospace Engineering from the Indian Institute of Space science & Technology (IIST) Thiruvananthapuram (2017).

==Video Presentation ==

{{#widget:Youtube
|id =TgvqzTULOag
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Finite_Element_Analysis]]
[[Category:Simulation_Methods]]
[[Category:Overview]]

Main Page

2024-12-17T16:43:55Z

Jadmin: /* Next Seminar Series */

__NOTOC__
{{DISPLAYTITLE: Committee on Joint Mechanics}}
= Welcome to the Committee on Joint Mechanics Webpage =

On this page, you can find

# Current and past [[Benchmarks|benchmark]] structures studied by the community
# [[Calendar|Calendar]] of events (Conferences, Due Dates, Seminars)
# [[:Category:Seminar_Series|Seminar]] Presentations and associated papers
# [[Research_Camps|Research Camps/ Institutes]] hosted by the community
# [[:Category:Job Postings|Job Postings]]
# [[:Category:Recent_Graduates|Recent Graduates]] in the community

=Summer Research Camp Recruiting=
Both summer research camps for our community are recruiting for this summer
# Tribomechadynamics Research Camp 2024 due March 15, 2024 [[TRC2024|More Information Here]]
# NOMAD 2024 due in Early March 2024 [[NOMAD2024|More Information Here]]

=Next Seminar Series=

Our Seminar Series will be in Janurary

Most recent December 17, 2024 by Svenja Hermann on Beyond Band Gaps: Modeling Mechanical Metamaterials for Engineering Applications. More information [[Beyond Band Gaps: Modeling Mechanical Metamaterials for Engineering Applications Dec 2024|here]].

The Schedule of talks can also be seen on the calendar for the local time zone.

For more information on our Seminar Series and a List at: [[:Category:Seminar_Series|List of all Hosted Seminars]]

Previous Introductory Seminars include:
# Understanding Jointed Interfaces Through [[Understanding_Jointed_interfaces_Through_Tribomechadynamics_Brake_Sept_2022|Tribomechadynamics]]
# Introduction to Structural [[Introduction_to_Structural_Dynamics_Matt_Allen_May112021|Dynamics]]
# Introduction to Nonlinear Normal [[Introduction_to_Nonlinear_Normal_Modes_Gaetan_Kerschen_June82021|Modes]]
# Introduction to Harmonic Balance and Continuation [[Introduction_to_Harmonic_Balance_and_Continuation_Methods_Loic_Salles_July202021|Methods]]
# Non-Contact Diagnostics in Structural [[NonContact_Diagnotics_in_Structural_Dynamics_Daniel_Rohe_April122022|Dynamics]]
# Nonlinear Modes of Jointed [[Nonlinear_Modes_of_Jointed_Structures_by_Malte_Krack_March_2023|Structures]]

Previous Conferences:
# [[TMD2021|Tribomechadynamics]] Conference 2021
# [[TMD2023|Tribomechadynamics]] Conference 2023

Previous Research Camp Presentations
# [[TRC2022Presentations|Tribomechadynamics]] Research Camp 2022 Final Presentations

Committee Minutes
#IMAC 2022 [[IMAC2022Minutes|Minutes]]

=Upcoming Events=
See the calendar for all upcoming events and dates.

==Tribomechadynamics 2025==
I'm pleased to announce that Tribomechadynamics 2025 will be hosted at the University of Stuttgart from August 25-27. This conference is held every other year in conjunction with our Tribomechadynamics Research Camp. As usual, there will be four tracks: nonlinear/structural dynamics, contact mechanics, tribology, and the integration of these three topics into Tribomechadynamics.

I'm also pleased to announce our three keynote speakers:

Alice Cicirello, University of Cambridge

David Nowell, Imperial College London

Pascal Reuß, Mercedes-Benz AG

We will be posting more information soon, but please feel free to visit our website in the meantime:

http://tmd.rice.edu/tribomechadynamics-2025/

Key dates for the conference are:
#Abstracts due May 1st, 2025
#Acceptance notification by May 15th, 2025
#Full Papers due August 1st, 2025 (student paper competition submissions)
#Extended Abstracts due August 15th, 2025 (non-student paper competition submissions)
#Registration deadline (for the advanced registration rate) is August 18th, 2025
#Conference dates are August 25th through 27th, 2025.

Lastly, for those of you traveling from overseas, the conference has been timed such that you can also attend the International Conference on Experimental Continuation in Nonlinear Dynamics (XCON), hosted by Ghislain Raze and Gaetan Kerschen in Liege, Belgium from August 28-29. Their website is http://www.s3l.be/en/xcon.

Please feel free to reach out to us if you have any questions,

Matthew Brake, Christoph Schwingshackl, and Malte Krack

=Calendar=

To add an event to the calendar please email us at: [mailto:joints.committee+events@gmail.com Joints Committee Gmail]

{{#widget:Google Calendar
|id=ptjdmbb9qjj6fvm8mmclif3kig@group.calendar.google.com
|color=2952A3
|height = 600
|width = 50%
|showtz
|view = agenda
}}

Beyond Band Gaps: Modeling Mechanical Metamaterials for Engineering Applications Dec 2024

2024-12-17T16:43:27Z

Jadmin: Created page with "{{DISPLAYTITLE:Beyond Band Gaps: Modeling Mechanical Metamaterials for Engineering Applications by Svenja Hermann, Dec. 17, 2024}} ==Beyond Band Gaps: Modeling Mechanical Metamaterials for Engineering Applications== Svenja Hermann TU Dortmund December 17, 2024 ===Abstract:=== Mechanical metamaterials offer unique capabilities for wave control and vibration mitigation. For these materials, there are certain frequency ranges in which waves cannot freely propagate in sp..."

{{DISPLAYTITLE:Beyond Band Gaps: Modeling Mechanical Metamaterials for Engineering Applications by Svenja Hermann, Dec. 17, 2024}}
==Beyond Band Gaps: Modeling Mechanical Metamaterials for Engineering Applications==

Svenja Hermann

TU Dortmund

December 17, 2024

===Abstract:===
Mechanical metamaterials offer unique capabilities for wave control and vibration mitigation. For these materials, there are certain frequency ranges in which waves cannot freely propagate in space—so-called band gaps. The unusual behavior of metamaterials stems from their specially designed microstructure. The metamaterial is composed of repeating geometric elements, called unit cells, which form the periodically arranged microstructure. Conceptually, a metamaterial consists of an array in which the unit cells are repeated to an infinitely large extent.

Modeling techniques involve periodicity theorems that enable the representation of a metamaterial of an infinitely large extent by a single unit cell. Therefore, it has become a well-established practice in the engineering community to optimize vibration mitigation in a mechanical metamaterial based on modifying the underlying unit cell during the last few years. Meanwhile, the performance of metamaterials in finite-sized structures, in which they are integrated with and connected to commonly used materials, has been much less explored. For practical engineering design tasks, however, dealing with finite-sized structures is essential.

This talk will begin with a short review of established practices in modeling infinite metamaterials. We will then shift focus to the challenges of modeling and experimental testing finite-size metamaterial structures, such as boundary conditions and the modeling of large-scale structures. Following this topic, a continuum modeling approach for metamaterials will be introduced. We will discuss briefly how using the so-called relaxed micromorphic model allows us to represent the dynamic behavior of structures in which metamaterials and classical materials of finite size are combined while keeping the computational effort comparatively low. Finally, we will examine several remaining challenges and perspectives for the work with finite-sized metamaterial structures.

===Biography:===
Svenja Hermann is a Postdoctoral Researcher at the chair of Continuum Mechanics of the Institute of Structural Mechanics, Statics and Dynamics at TU Dortmund, which is led by Prof. A. Madeo. She received her PhD from the Université Bourgogne-Franche-Comté in 2021, where her research focused on the modeling and experimental testing of magnetoactive elastomers, taking into account the magneto-mechanical coupling in the composite. Her current research at TU Dortmund involves the modeling and testing of mechanical metamaterials at finite scales and is being carried out as part of the ERC-funded research project META-LEGO.

==Video Presentation ==

{{#widget:Youtube
|id =9KmdJKtoudY
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Finite_Element_Analysis]]
[[Category:Experimental_Techniques]]

Main Page

2024-11-22T12:49:28Z

Jadmin: /* Upcoming Events */

__NOTOC__
{{DISPLAYTITLE: Committee on Joint Mechanics}}
= Welcome to the Committee on Joint Mechanics Webpage =

On this page, you can find

# Current and past [[Benchmarks|benchmark]] structures studied by the community
# [[Calendar|Calendar]] of events (Conferences, Due Dates, Seminars)
# [[:Category:Seminar_Series|Seminar]] Presentations and associated papers
# [[Research_Camps|Research Camps/ Institutes]] hosted by the community
# [[:Category:Job Postings|Job Postings]]
# [[:Category:Recent_Graduates|Recent Graduates]] in the community

=Summer Research Camp Recruiting=
Both summer research camps for our community are recruiting for this summer
# Tribomechadynamics Research Camp 2024 due March 15, 2024 [[TRC2024|More Information Here]]
# NOMAD 2024 due in Early March 2024 [[NOMAD2024|More Information Here]]

=Next Seminar Series=

Our Seminar Series will be on November 12, 2024 by Michael J. Leamy on Nonlinear_Wave-Based Vibration Approach for Analytical Determination of Periodic Solutions and Stability in Jointed Bars. More information [[Nonlinear_Wave-Based_Vibration_Approach_for_Analytical_Determination_of_Periodic_Solutions_and_Stability_in_Jointed_Bars_Nov_2024|here]].

The Schedule of talks can also be seen on the calendar for the local time zone.

For more information on our Seminar Series and a List at: [[:Category:Seminar_Series|List of all Hosted Seminars]]

Previous Introductory Seminars include:
# Understanding Jointed Interfaces Through [[Understanding_Jointed_interfaces_Through_Tribomechadynamics_Brake_Sept_2022|Tribomechadynamics]]
# Introduction to Structural [[Introduction_to_Structural_Dynamics_Matt_Allen_May112021|Dynamics]]
# Introduction to Nonlinear Normal [[Introduction_to_Nonlinear_Normal_Modes_Gaetan_Kerschen_June82021|Modes]]
# Introduction to Harmonic Balance and Continuation [[Introduction_to_Harmonic_Balance_and_Continuation_Methods_Loic_Salles_July202021|Methods]]
# Non-Contact Diagnostics in Structural [[NonContact_Diagnotics_in_Structural_Dynamics_Daniel_Rohe_April122022|Dynamics]]
# Nonlinear Modes of Jointed [[Nonlinear_Modes_of_Jointed_Structures_by_Malte_Krack_March_2023|Structures]]

Previous Conferences:
# [[TMD2021|Tribomechadynamics]] Conference 2021
# [[TMD2023|Tribomechadynamics]] Conference 2023

Previous Research Camp Presentations
# [[TRC2022Presentations|Tribomechadynamics]] Research Camp 2022 Final Presentations

Committee Minutes
#IMAC 2022 [[IMAC2022Minutes|Minutes]]

=Upcoming Events=
See the calendar for all upcoming events and dates.

==Tribomechadynamics 2025==
I'm pleased to announce that Tribomechadynamics 2025 will be hosted at the University of Stuttgart from August 25-27. This conference is held every other year in conjunction with our Tribomechadynamics Research Camp. As usual, there will be four tracks: nonlinear/structural dynamics, contact mechanics, tribology, and the integration of these three topics into Tribomechadynamics.

I'm also pleased to announce our three keynote speakers:

Alice Cicirello, University of Cambridge

David Nowell, Imperial College London

Pascal Reuß, Mercedes-Benz AG

We will be posting more information soon, but please feel free to visit our website in the meantime:

http://tmd.rice.edu/tribomechadynamics-2025/

Key dates for the conference are:
#Abstracts due May 1st, 2025
#Acceptance notification by May 15th, 2025
#Full Papers due August 1st, 2025 (student paper competition submissions)
#Extended Abstracts due August 15th, 2025 (non-student paper competition submissions)
#Registration deadline (for the advanced registration rate) is August 18th, 2025
#Conference dates are August 25th through 27th, 2025.

Lastly, for those of you traveling from overseas, the conference has been timed such that you can also attend the International Conference on Experimental Continuation in Nonlinear Dynamics (XCON), hosted by Ghislain Raze and Gaetan Kerschen in Liege, Belgium from August 28-29. Their website is http://www.s3l.be/en/xcon.

Please feel free to reach out to us if you have any questions,

Matthew Brake, Christoph Schwingshackl, and Malte Krack

=Calendar=

To add an event to the calendar please email us at: [mailto:joints.committee+events@gmail.com Joints Committee Gmail]

{{#widget:Google Calendar
|id=ptjdmbb9qjj6fvm8mmclif3kig@group.calendar.google.com
|color=2952A3
|height = 600
|width = 50%
|showtz
|view = agenda
}}

Main Page

2024-11-22T12:48:46Z

Jadmin: /* Upcoming Events */

__NOTOC__
{{DISPLAYTITLE: Committee on Joint Mechanics}}
= Welcome to the Committee on Joint Mechanics Webpage =

On this page, you can find

# Current and past [[Benchmarks|benchmark]] structures studied by the community
# [[Calendar|Calendar]] of events (Conferences, Due Dates, Seminars)
# [[:Category:Seminar_Series|Seminar]] Presentations and associated papers
# [[Research_Camps|Research Camps/ Institutes]] hosted by the community
# [[:Category:Job Postings|Job Postings]]
# [[:Category:Recent_Graduates|Recent Graduates]] in the community

=Summer Research Camp Recruiting=
Both summer research camps for our community are recruiting for this summer
# Tribomechadynamics Research Camp 2024 due March 15, 2024 [[TRC2024|More Information Here]]
# NOMAD 2024 due in Early March 2024 [[NOMAD2024|More Information Here]]

=Next Seminar Series=

Our Seminar Series will be on November 12, 2024 by Michael J. Leamy on Nonlinear_Wave-Based Vibration Approach for Analytical Determination of Periodic Solutions and Stability in Jointed Bars. More information [[Nonlinear_Wave-Based_Vibration_Approach_for_Analytical_Determination_of_Periodic_Solutions_and_Stability_in_Jointed_Bars_Nov_2024|here]].

The Schedule of talks can also be seen on the calendar for the local time zone.

For more information on our Seminar Series and a List at: [[:Category:Seminar_Series|List of all Hosted Seminars]]

Previous Introductory Seminars include:
# Understanding Jointed Interfaces Through [[Understanding_Jointed_interfaces_Through_Tribomechadynamics_Brake_Sept_2022|Tribomechadynamics]]
# Introduction to Structural [[Introduction_to_Structural_Dynamics_Matt_Allen_May112021|Dynamics]]
# Introduction to Nonlinear Normal [[Introduction_to_Nonlinear_Normal_Modes_Gaetan_Kerschen_June82021|Modes]]
# Introduction to Harmonic Balance and Continuation [[Introduction_to_Harmonic_Balance_and_Continuation_Methods_Loic_Salles_July202021|Methods]]
# Non-Contact Diagnostics in Structural [[NonContact_Diagnotics_in_Structural_Dynamics_Daniel_Rohe_April122022|Dynamics]]
# Nonlinear Modes of Jointed [[Nonlinear_Modes_of_Jointed_Structures_by_Malte_Krack_March_2023|Structures]]

Previous Conferences:
# [[TMD2021|Tribomechadynamics]] Conference 2021
# [[TMD2023|Tribomechadynamics]] Conference 2023

Previous Research Camp Presentations
# [[TRC2022Presentations|Tribomechadynamics]] Research Camp 2022 Final Presentations

Committee Minutes
#IMAC 2022 [[IMAC2022Minutes|Minutes]]

=Upcoming Events=
See the calendar for all upcoming events and dates.

I'm pleased to announce that Tribomechadynamics 2025 will be hosted at the University of Stuttgart from August 25-27. This conference is held every other year in conjunction with our Tribomechadynamics Research Camp. As usual, there will be four tracks: nonlinear/structural dynamics, contact mechanics, tribology, and the integration of these three topics into Tribomechadynamics.

I'm also pleased to announce our three keynote speakers:

Alice Cicirello, University of Cambridge

David Nowell, Imperial College London

Pascal Reuß, Mercedes-Benz AG

We will be posting more information soon, but please feel free to visit our website in the meantime:

http://tmd.rice.edu/tribomechadynamics-2025/

Key dates for the conference are:
#Abstracts due May 1st, 2025
#Acceptance notification by May 15th, 2025
#Full Papers due August 1st, 2025 (student paper competition submissions)
#Extended Abstracts due August 15th, 2025 (non-student paper competition submissions)
#Registration deadline (for the advanced registration rate) is August 18th, 2025
#Conference dates are August 25th through 27th, 2025.

Lastly, for those of you traveling from overseas, the conference has been timed such that you can also attend the International Conference on Experimental Continuation in Nonlinear Dynamics (XCON), hosted by Ghislain Raze and Gaetan Kerschen in Liege, Belgium from August 28-29. Their website is http://www.s3l.be/en/xcon.

Please feel free to reach out to us if you have any questions,

Matthew Brake, Christoph Schwingshackl, and Malte Krack

=Calendar=

To add an event to the calendar please email us at: [mailto:joints.committee+events@gmail.com Joints Committee Gmail]

{{#widget:Google Calendar
|id=ptjdmbb9qjj6fvm8mmclif3kig@group.calendar.google.com
|color=2952A3
|height = 600
|width = 50%
|showtz
|view = agenda
}}

Nonlinear Wave-Based Vibration Approach for Analytical Determination of Periodic Solutions and Stability in Jointed Bars Nov 2024

2024-11-22T12:46:10Z

Jadmin: /* Video Presentation */

{{DISPLAYTITLE:Nonlinear Wave-Based Vibration Approach for Analytical Determination of Periodic Solutions and Stability in Jointed Bars, by Michael J. Leamy, Nov. 11, 2024}}
==Nonlinear Wave-Based Vibration Approach for Analytical Determination of Periodic Solutions and Stability in Jointed Bars==

Michael J. Leamy (with M. Brake and N. Balaji)

Georgia Institute of Technology

November 12, 2024

===Abstract:===
In this work we detail an analytical, wave-based approach for predicting the forced periodic response and solution stability of continuous systems joined by nonlinear coupling. We first describe an asymptotic approach for determining wave scattering at damped, weakly-nonlinear joints and apply it to elastic bars. Scattering of the incident wave leads to reflection and transmission at the incident frequency and higher harmonics. These scattering relationships are then used in a wave-based vibration approach, together with linear scattering relationships for loading and boundary conditions, to determine the periodic response of the continuous systems to forcing. We then determine solution stability using a local linear analysis. The local linear analysis yields parametrically-excited systems whose stability is found using a strained-parameter approach combined with a second wave-based analysis. Both wave-based approaches, for determining periodic response to forcing and for assessing stability, employ exact wave solutions for the structural members and asymptotic analysis of the joints. This results in nearly-exact solutions, of minimal size, valid for all frequencies – this can be contrasted with numerical approaches requiring increasing degrees of freedom (e.g., finer discretizations) with increasing frequency. Comparisons to finite element-harmonic balance solutions document excellent agreement with speedup on the order of 30X. Planned research and extensions will be discussed for jointed frames composed of beam-like members.

===Biography:===

Michael J. Leamy joined the George W. Woodruff School of Mechanical Engineering, Georgia Tech, as an Assistant Professor in August, 2007. He was promoted to Associate Professor (2012) and Professor (2018), and was later named a Woodruff Endowed Professor in 2024. He presently serves as the Editor-in-Chief of the ASME Journal of Vibration and Acoustics, and a Specialty Topic Chief Editor for Frontiers in Acoustics. He received his B.S. from Clarkson University (1993), and his M.S., and Ph.D. (1995, 1998) from The University of Michigan, Ann Arbor, all in Mechanical Engineering. Prior to his position at Georgia Tech, Professor Leamy worked as an Assistant Professor at the United States Military Academy (West Point, NY), a Research Scientist at the MITRE Corporation (McLean, VA), a Research Associate at the NASA Langley Research Center (Hampton, VA), and a Postdoctoral Fellow at Israel’s Institute of Technology (Technion). Professor Leamy’s research interests are in emerging and multidisciplinary areas of engineering science, with an emphasis on nonlinear dynamical behavior in structures, materials, and complex systems. Emerging engineering materials of particular interest include acoustic metamaterials, topological insulators, and reciprocity-breaking nonlinear lattices. He has received the Distinguished Achievement Award (1998) from the University of Michigan, a Koret Foundation Fellowship (1998) from the Technion, the Army’s Superior Civilian Service Award (2003), the Lockheed Dean’s Excellence in Teaching Award (2010), and the Lloyd Hamilton Donnell Best Paper Award from Applied Mechanics Reviews (co-recipient, 2016). In addition, he was named a Fellow by ASME (2014), and a Woodruff Faculty Fellow (2017) by the George Woodruff School of Mechanical Engineering. His past and current editorial positions include serving as an Associate Editor for the Journal of Vibration and Acoustics (2011-2017), Applied Mechanics Reviews (2018-2023), Nonlinear Dynamics (2019-2023), and Wave Motion (2017-Present). Professor Leamy’s research program has been supported by the Ford Motor Corporation, General Motors, Honeywell Inc., Ferrari S.p.A., ThyssenKrupp Elevator America, Sandia National Laboratories, the National Science Foundation, the Department of Energy, the Defense Threat Reduction Agency, the Army Research Office, and the Office of Naval Research.

==Video Presentation ==

Video release has been delayed by request of the presenter.

{{#widget:Youtube
|id =Zw8VuBmQGvM
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Finite_Element_Analysis]]
[[Category:Experimental_Techniques]]

Main Page

2024-11-12T15:14:56Z

Jadmin: /* Next Seminar Series */

Nonlinear Wave-Based Vibration Approach for Analytical Determination of Periodic Solutions and Stability in Jointed Bars Nov 2024

2024-11-12T15:13:39Z

Jadmin: Created page with "{{DISPLAYTITLE:Nonlinear Wave-Based Vibration Approach for Analytical Determination of Periodic Solutions and Stability in Jointed Bars, by Michael J. Leamy, Nov. 11, 2024}} ==Nonlinear Wave-Based Vibration Approach for Analytical Determination of Periodic Solutions and Stability in Jointed Bars== Michael J. Leamy (with M. Brake and N. Balaji) Georgia Institute of Technology November 12, 2024 ===Abstract:=== In this work we detail an analytical, wave-based approac..."

{{DISPLAYTITLE:Nonlinear Wave-Based Vibration Approach for Analytical Determination of Periodic Solutions and Stability in Jointed Bars, by Michael J. Leamy, Nov. 11, 2024}}
==Nonlinear Wave-Based Vibration Approach for Analytical Determination of Periodic Solutions and Stability in Jointed Bars==

Michael J. Leamy (with M. Brake and N. Balaji)

Georgia Institute of Technology

November 12, 2024

===Abstract:===
In this work we detail an analytical, wave-based approach for predicting the forced periodic response and solution stability of continuous systems joined by nonlinear coupling. We first describe an asymptotic approach for determining wave scattering at damped, weakly-nonlinear joints and apply it to elastic bars. Scattering of the incident wave leads to reflection and transmission at the incident frequency and higher harmonics. These scattering relationships are then used in a wave-based vibration approach, together with linear scattering relationships for loading and boundary conditions, to determine the periodic response of the continuous systems to forcing. We then determine solution stability using a local linear analysis. The local linear analysis yields parametrically-excited systems whose stability is found using a strained-parameter approach combined with a second wave-based analysis. Both wave-based approaches, for determining periodic response to forcing and for assessing stability, employ exact wave solutions for the structural members and asymptotic analysis of the joints. This results in nearly-exact solutions, of minimal size, valid for all frequencies – this can be contrasted with numerical approaches requiring increasing degrees of freedom (e.g., finer discretizations) with increasing frequency. Comparisons to finite element-harmonic balance solutions document excellent agreement with speedup on the order of 30X. Planned research and extensions will be discussed for jointed frames composed of beam-like members.

===Biography:===

Michael J. Leamy joined the George W. Woodruff School of Mechanical Engineering, Georgia Tech, as an Assistant Professor in August, 2007. He was promoted to Associate Professor (2012) and Professor (2018), and was later named a Woodruff Endowed Professor in 2024. He presently serves as the Editor-in-Chief of the ASME Journal of Vibration and Acoustics, and a Specialty Topic Chief Editor for Frontiers in Acoustics. He received his B.S. from Clarkson University (1993), and his M.S., and Ph.D. (1995, 1998) from The University of Michigan, Ann Arbor, all in Mechanical Engineering. Prior to his position at Georgia Tech, Professor Leamy worked as an Assistant Professor at the United States Military Academy (West Point, NY), a Research Scientist at the MITRE Corporation (McLean, VA), a Research Associate at the NASA Langley Research Center (Hampton, VA), and a Postdoctoral Fellow at Israel’s Institute of Technology (Technion). Professor Leamy’s research interests are in emerging and multidisciplinary areas of engineering science, with an emphasis on nonlinear dynamical behavior in structures, materials, and complex systems. Emerging engineering materials of particular interest include acoustic metamaterials, topological insulators, and reciprocity-breaking nonlinear lattices. He has received the Distinguished Achievement Award (1998) from the University of Michigan, a Koret Foundation Fellowship (1998) from the Technion, the Army’s Superior Civilian Service Award (2003), the Lockheed Dean’s Excellence in Teaching Award (2010), and the Lloyd Hamilton Donnell Best Paper Award from Applied Mechanics Reviews (co-recipient, 2016). In addition, he was named a Fellow by ASME (2014), and a Woodruff Faculty Fellow (2017) by the George Woodruff School of Mechanical Engineering. His past and current editorial positions include serving as an Associate Editor for the Journal of Vibration and Acoustics (2011-2017), Applied Mechanics Reviews (2018-2023), Nonlinear Dynamics (2019-2023), and Wave Motion (2017-Present). Professor Leamy’s research program has been supported by the Ford Motor Corporation, General Motors, Honeywell Inc., Ferrari S.p.A., ThyssenKrupp Elevator America, Sandia National Laboratories, the National Science Foundation, the Department of Energy, the Defense Threat Reduction Agency, the Army Research Office, and the Office of Naval Research.

==Video Presentation ==

Video release has been delayed by request of the presenter.

{{#widget:Youtube
|id =
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Finite_Element_Analysis]]
[[Category:Experimental_Techniques]]

Challenges of applying topology optimization to multiscale problems Tamur Oct 2024

2024-11-12T15:10:15Z

Jadmin: /* Video Presentation */

{{DISPLAYTITLE:Challenges of applying topology optimization to multiscale problems by Caglar Tamur, Oct. 22, 2024}}
==Challenges of applying topology optimization to multiscale problems==

Caglar Tamur

University of California San Diego

October 22, 2024

===Abstract:===
Topology optimization in engineering design has demonstrated its capability to provide creative and unintuitive designs, previously not thought of. For a component designed for one functionality under one physics, an optimized design is often intuitive and apparent to an experienced engineer thus, given the potential challenges associated with manufacturing and scaling of production, topology optimization often does not offer significant benefits over the traditional engineering approaches. However, when considering complex multiscale conditions, the nonlinear coupling effects are not obvious nor intuitive to an engineer and the optimized designs are likely to be beyond human intuition. The benefits of topology optimization thus, can be substantial in complex structures. However topology optimization faces some fundamental challenges in some classes of design problems. We will review some of the recent research efforts to address complex design problems via topology optimization, and discuss the challenges and opportunities.

===Biography:===

Caglar Tamur is a Postdoctoral Researcher in Multiscale, Multiphysics Design Optimization (M2DO) Lab at UC San Diego, which is led by Prof. H. Alicia Kim. He received his PhD from UC Berkeley in 2024, where his researched focused on computational solid mechanics with an emphasis on multiscale modeling of polymers and peridynamics models for fracture mechanics. His current research at UCSD involves topology optimization for metamaterial systems for nonlinear dynamics and shock manipulation. He is the recipient of a Fulbright Scholarship

==Video Presentation ==

Video release has been delayed by request of the presenter.

{{#widget:Youtube
|id =
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Finite_Element_Analysis]]
[[Category:Experimental_Techniques]]

Challenges of applying topology optimization to multiscale problems Tamur Oct 2024

2024-10-18T15:58:25Z

Jadmin: Created page with "{{DISPLAYTITLE:Challenges of applying topology optimization to multiscale problems by Caglar Tamur, Oct. 22, 2024}} ==Challenges of applying topology optimization to multiscale problems== Caglar Tamur University of California San Diego October 22, 2024 ===Abstract:=== Topology optimization in engineering design has demonstrated its capability to provide creative and unintuitive designs, previously not thought of. For a component designed for one functionality under..."

{{DISPLAYTITLE:Challenges of applying topology optimization to multiscale problems by Caglar Tamur, Oct. 22, 2024}}
==Challenges of applying topology optimization to multiscale problems==

Caglar Tamur

University of California San Diego

October 22, 2024

===Abstract:===
Topology optimization in engineering design has demonstrated its capability to provide creative and unintuitive designs, previously not thought of. For a component designed for one functionality under one physics, an optimized design is often intuitive and apparent to an experienced engineer thus, given the potential challenges associated with manufacturing and scaling of production, topology optimization often does not offer significant benefits over the traditional engineering approaches. However, when considering complex multiscale conditions, the nonlinear coupling effects are not obvious nor intuitive to an engineer and the optimized designs are likely to be beyond human intuition. The benefits of topology optimization thus, can be substantial in complex structures. However topology optimization faces some fundamental challenges in some classes of design problems. We will review some of the recent research efforts to address complex design problems via topology optimization, and discuss the challenges and opportunities.

===Biography:===

Caglar Tamur is a Postdoctoral Researcher in Multiscale, Multiphysics Design Optimization (M2DO) Lab at UC San Diego, which is led by Prof. H. Alicia Kim. He received his PhD from UC Berkeley in 2024, where his researched focused on computational solid mechanics with an emphasis on multiscale modeling of polymers and peridynamics models for fracture mechanics. His current research at UCSD involves topology optimization for metamaterial systems for nonlinear dynamics and shock manipulation. He is the recipient of a Fulbright Scholarship

==Video Presentation ==
{{#widget:Youtube
|id =
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Finite_Element_Analysis]]
[[Category:Experimental_Techniques]]

Main Page

2024-10-18T15:54:16Z

Jadmin:

Main Page

2024-10-18T15:53:58Z

Jadmin: /* Next Seminar Series */

Ryan Schultz Intro Digital Signal Processing Structural Dynamics Practitioner May 2024

2024-08-23T12:26:46Z

Jadmin: /* Slides */

{{DISPLAYTITLE:Intro to Digital Signal Processing (DSP) for the Structural Dynamics Practitioner by Ryan Schultz, May 28, 2024}}
==Intro to Digital Signal Processing (DSP) for the Structural Dynamics Practitioner==

Ryan Schultz

Research and Development Engineer, Sandia National Laboratories

May 28, 2024

===Abstract:===
Often, in structural dynamics modeling, testing, or analysis, dynamic data is collected and used to understand system behavior or environmental characteristics. This data, in its raw form (e.g., time histories), is not immediately useful. Digital signal processing allows the raw data to be converted into useful quantities of interest, like power spectral densities or frequency response functions, which provide a clearer picture of the dynamic characteristics of the system or environment. This talk provides a brief introduction to digital signal processing, focused on concepts and methods often used by the structural dynamics practitioner.

===Biography:===

Ryan Schultz is a research and development engineer in the Environments Engineering department at Sandia National Laboratories. His interests include multiple-input/multiple-output testing and analysis, vibroacoustics, structural dynamics, and inverse problems.

==Slides==
{{#widget:PDF
|url =https://drive.google.com/file/d/1tmZ54uuGs6TIHeRvlnTFZz5M5a0HXjNm/preview
|hieght = 200
|width = 720
}}

[[Category:Seminar_Series]]
[[Category:Experimental_Techniques]]
[[Categoyg:Structural_Dynamics]]

Ryan Schultz Intro Digital Signal Processing Structural Dynamics Practitioner May 2024

2024-08-23T12:25:44Z

Jadmin: /* Video Presentation */

{{DISPLAYTITLE:Intro to Digital Signal Processing (DSP) for the Structural Dynamics Practitioner by Ryan Schultz, May 28, 2024}}
==Intro to Digital Signal Processing (DSP) for the Structural Dynamics Practitioner==

Ryan Schultz

Research and Development Engineer, Sandia National Laboratories

May 28, 2024

===Abstract:===
Often, in structural dynamics modeling, testing, or analysis, dynamic data is collected and used to understand system behavior or environmental characteristics. This data, in its raw form (e.g., time histories), is not immediately useful. Digital signal processing allows the raw data to be converted into useful quantities of interest, like power spectral densities or frequency response functions, which provide a clearer picture of the dynamic characteristics of the system or environment. This talk provides a brief introduction to digital signal processing, focused on concepts and methods often used by the structural dynamics practitioner.

===Biography:===

Ryan Schultz is a research and development engineer in the Environments Engineering department at Sandia National Laboratories. His interests include multiple-input/multiple-output testing and analysis, vibroacoustics, structural dynamics, and inverse problems.

==Slides==
{{#widget:PDF
|url =https://https://drive.google.com/drive/folders/1JbYX-O7DTfQ2QTvz5TDafztKzupiFfcP/preview
|hieght = 200
|width = 720
}}

[[Category:Seminar_Series]]
[[Category:Experimental_Techniques]]
[[Categoyg:Structural_Dynamics]]

Closely Spaced Modes Aug 2024

2024-08-21T14:33:11Z

Jadmin: Created page with " As promised, here is the data for our community challenge on identifying the nonlinear characteristics of closely spaced modes. The full set of data, as well as an overview presentation and descriptions of the data, can be found on box: https://rice.box.com/s/iuubosphirhvixrfj9z3pqdby9sjr7ua For the first stage of the challenge, we would like to focus on modes 2 and 3, which are located at 236 and 238 Hz. For an overview of the data, please see the attached pdf. Fo..."

As promised, here is the data for our community challenge on identifying the nonlinear characteristics of closely spaced modes. The full set of data, as well as an overview presentation and descriptions of the data, can be found on box:

https://rice.box.com/s/iuubosphirhvixrfj9z3pqdby9sjr7ua

For the first stage of the challenge, we would like to focus on modes 2 and 3, which are located at 236 and 238 Hz. For an overview of the data, please see the attached pdf.

For those of you participating in the challenge, please let me know by Monday, July 29th, if you would like to present in the mini-symposium on Friday, August 2nd in order to share your method and preliminary results.

To see the presentations, we will host the mini-symposium on in-space again on Friday, August 2nd at 7:30 am MDT/9:30 am EDT/2:30 pm London/3:30 pm Western Europe.

https://app.inspace.chat/space/F79F48B2AC03266BA50D08B3FDD0B1874618EB3F/D038BB9CC55E4AF1365BF0167A0E6C04D033EAB8

The current set of presentations (each 15 minutes long) is:

Ben Moldenhauer, SNL - Overview of the data
TRC - which will have two submissions for the challenge
USF - which will have one submission for the challenge
NOMAD - which will have two or three submissions for the challenge (let me know soon how many)

==Video Presentation ==
{{#widget:Youtube
|id = y_XeM6QAjIA
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Overview]]
[[Category:Modal Analysis]]
[[Category:Nonlinear Modal Analysis]]
[[Category:Experimental Modal Analysis]]
[[Category:Nonlinear System Identification]]

Research Needs & Open Questions in Vibration Energy Transport & Dissipation

2024-07-02T21:08:13Z

Jadmin: Created page with "==Slides== {{#widget:PDF |url =https://drive.google.com/file/d/1ZQRhN6_dZwprTeEbLeA7VYOL_fqOAqdI/preview |hieght = 200 |width = 720 }} Category:Joint_Workshop_Reports"

==Slides==
{{#widget:PDF
|url =https://drive.google.com/file/d/1ZQRhN6_dZwprTeEbLeA7VYOL_fqOAqdI/preview
|hieght = 200
|width = 720
}}

[[Category:Joint_Workshop_Reports]]

Main Page

2024-06-04T22:50:00Z

Jadmin: /* Next Seminar Series */

Ryan Schultz Intro Digital Signal Processing Structural Dynamics Practitioner May 2024

2024-05-21T14:47:44Z

Jadmin: Created page with "{{DISPLAYTITLE:Intro to Digital Signal Processing (DSP) for the Structural Dynamics Practitioner by Ryan Schultz, May 28, 2024}} ==Intro to Digital Signal Processing (DSP) for the Structural Dynamics Practitioner== Ryan Schultz Research and Development Engineer, Sandia National Laboratories May 28, 2024 ===Abstract:=== Often, in structural dynamics modeling, testing, or analysis, dynamic data is collected and used to understand system behavior or environmental charac..."

{{DISPLAYTITLE:Intro to Digital Signal Processing (DSP) for the Structural Dynamics Practitioner by Ryan Schultz, May 28, 2024}}
==Intro to Digital Signal Processing (DSP) for the Structural Dynamics Practitioner==

Ryan Schultz

Research and Development Engineer, Sandia National Laboratories

May 28, 2024

===Abstract:===
Often, in structural dynamics modeling, testing, or analysis, dynamic data is collected and used to understand system behavior or environmental characteristics. This data, in its raw form (e.g., time histories), is not immediately useful. Digital signal processing allows the raw data to be converted into useful quantities of interest, like power spectral densities or frequency response functions, which provide a clearer picture of the dynamic characteristics of the system or environment. This talk provides a brief introduction to digital signal processing, focused on concepts and methods often used by the structural dynamics practitioner.

===Biography:===

Ryan Schultz is a research and development engineer in the Environments Engineering department at Sandia National Laboratories. His interests include multiple-input/multiple-output testing and analysis, vibroacoustics, structural dynamics, and inverse problems.

==Video Presentation ==
{{#widget:Youtube
|id =
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Experimental_Techniques]]
[[Categoyg:Structural_Dynamics]]

NOMAD2024

2024-02-13T15:02:39Z

Jadmin: Created page with "Dear Colleagues, I am writing to inform you that recruitment for the 11th annual Nonlinear Mechanics and Dynamics (NOMAD XI) Research Institute is underway. We are currently seeking highly qualified graduate students (MS or PhD) and undergraduate students interested in participating in our eight-week long program to work on one of six technical projects – more information forthcoming. For more details about the program or past projects, please see our NOMAD website a..."

Dear Colleagues,

I am writing to inform you that recruitment for the 11th annual Nonlinear Mechanics and Dynamics (NOMAD XI) Research Institute is underway. We are currently seeking highly qualified graduate students (MS or PhD) and undergraduate students interested in participating in our eight-week long program to work on one of six technical projects – more information forthcoming. For more details about the program or past projects, please see our NOMAD website and the attached flyer.

I wanted to share an update regarding the NOMAD program. Our internship postings are open for Winter/Spring recruiting. For undergraduate students, interested candidates should apply to job ID 692368, while graduate students can apply to our new posting ID 692353. These will stay open until early March, 2024.

The program will be in-person and held in Albuquerque, NM. Please consider forwarding this information to other students or colleagues who may be interested.

(My apologies if you received duplicate e-mails!)

Best Regards,

Debby Fowler

Deborah Fowler, Ph.D. (she/her)

1556 Component Science & Mechanics

Sandia National Laboratories

505-441-0656

dfowler@sandia.gov

==Slides==
{{#widget:PDF
|url =https://drive.google.com/file/d/183R3VjuG7KO2rxp0-bQ_k4IRqigybmWe/preview
|hieght = 200
|width = 720
}}

TRC2024

2024-02-13T14:59:40Z

Jadmin: /* Slides */

Dear all,

We're excited to announce the projects for the 2024 Tribomechadynamics Research Camp (TRC), which will be hosted by Dr. Christoph Schwingshackl at Imperial College London this summer. The research camp will run from July 1st through August 2nd, and the three projects this year are:

# System Identification of Closely Spaced Modes
In a collaboration with NOMAD and ETEST, we will be working on a community-wide challenge to extract the nonlinear characteristics of systems with closely spaced modes. The work at the TRC will build upon recent progress by Hugh Goyder and others, and will conclude the summer by applying our methods to a blind set of data measured by Sandia/ETEST. More details to come for the community-wide challenge if you're interested.

# Methods for Strongly Discontinuous Contact Events Based on Time Step Integration
One of the pressing needs identified at our recent workshop is the advancement of time integration methods for studying transient and shock events in jointed structures. This project will focus on evaluating the state-of-the-art methods for simulating the physics commonly observed in jointed structures.

# Monitoring the Interface Behavior of Bolted Joints
This experimental project seeks to apply the total internal reflection method to a real structure for the first time. A clear version of the Brake-Reuss beam will be fabricated for testing in which we will directly measure the contact patch evolution during dynamic excitation.

Applications will be due March 15th.

https://tribomechadynamics.blogs.rice.edu/tribomechadynamics-research-camp/

Matthew Brake, Christoph Schwingshackl, and Malte Krack

==Slides==
{{#widget:PDF
|url =https://drive.google.com/file/d/18D6VTFepFPjw9gZEaCzchJyehu9UqnYd/preview
|hieght = 200
|width = 720
}}

TRC2024

2024-02-13T14:59:03Z

Jadmin: /* Slides */

Dear all,

We're excited to announce the projects for the 2024 Tribomechadynamics Research Camp (TRC), which will be hosted by Dr. Christoph Schwingshackl at Imperial College London this summer. The research camp will run from July 1st through August 2nd, and the three projects this year are:

# System Identification of Closely Spaced Modes
In a collaboration with NOMAD and ETEST, we will be working on a community-wide challenge to extract the nonlinear characteristics of systems with closely spaced modes. The work at the TRC will build upon recent progress by Hugh Goyder and others, and will conclude the summer by applying our methods to a blind set of data measured by Sandia/ETEST. More details to come for the community-wide challenge if you're interested.

# Methods for Strongly Discontinuous Contact Events Based on Time Step Integration
One of the pressing needs identified at our recent workshop is the advancement of time integration methods for studying transient and shock events in jointed structures. This project will focus on evaluating the state-of-the-art methods for simulating the physics commonly observed in jointed structures.

# Monitoring the Interface Behavior of Bolted Joints
This experimental project seeks to apply the total internal reflection method to a real structure for the first time. A clear version of the Brake-Reuss beam will be fabricated for testing in which we will directly measure the contact patch evolution during dynamic excitation.

Applications will be due March 15th.

https://tribomechadynamics.blogs.rice.edu/tribomechadynamics-research-camp/

Matthew Brake, Christoph Schwingshackl, and Malte Krack

==Slides==
{{#widget:PDF
|url =https://drive.google.com/drive/u/1/folders/1ny1CSFpuHV4VKcIycydQib2kOZNKuQA/preview
|hieght = 200
|width = 720
}}

TRC2024

2024-02-13T14:58:45Z

Jadmin: Created page with "Dear all, We're excited to announce the projects for the 2024 Tribomechadynamics Research Camp (TRC), which will be hosted by Dr. Christoph Schwingshackl at Imperial College London this summer. The research camp will run from July 1st through August 2nd, and the three projects this year are: # System Identification of Closely Spaced Modes In a collaboration with NOMAD and ETEST, we will be working on a community-wide challenge to extract the nonlinear characteristics o..."

Dear all,

We're excited to announce the projects for the 2024 Tribomechadynamics Research Camp (TRC), which will be hosted by Dr. Christoph Schwingshackl at Imperial College London this summer. The research camp will run from July 1st through August 2nd, and the three projects this year are:

# System Identification of Closely Spaced Modes
In a collaboration with NOMAD and ETEST, we will be working on a community-wide challenge to extract the nonlinear characteristics of systems with closely spaced modes. The work at the TRC will build upon recent progress by Hugh Goyder and others, and will conclude the summer by applying our methods to a blind set of data measured by Sandia/ETEST. More details to come for the community-wide challenge if you're interested.

# Methods for Strongly Discontinuous Contact Events Based on Time Step Integration
One of the pressing needs identified at our recent workshop is the advancement of time integration methods for studying transient and shock events in jointed structures. This project will focus on evaluating the state-of-the-art methods for simulating the physics commonly observed in jointed structures.

# Monitoring the Interface Behavior of Bolted Joints
This experimental project seeks to apply the total internal reflection method to a real structure for the first time. A clear version of the Brake-Reuss beam will be fabricated for testing in which we will directly measure the contact patch evolution during dynamic excitation.

Applications will be due March 15th.

https://tribomechadynamics.blogs.rice.edu/tribomechadynamics-research-camp/

Matthew Brake, Christoph Schwingshackl, and Malte Krack

==Slides==
{{#widget:PDF
|url =https://drive.google.com/drive/u/1/folders/1ny1CSFpuHV4VKcIycydQib2kOZNKuQA-/preview
|hieght = 200
|width = 720
}}

Main Page

2024-02-13T14:55:26Z

Jadmin:

ISS Solar Alpha Rotary Joint Tribological Anomaly by Carlos Enriquez November 2023

2024-02-12T14:19:41Z

Jadmin: /* Video Presentation */

{{DISPLAYTITLE:ISS Solar Alpha Rotary Joint Tribological Anomaly by Carlos Enriquez, January 2024}}
==ISS Solar Alpha Rotary Joint Tribological Anomaly==

Carlos Enriquez

NASA

November 28, 2023

===Abstract:===

In early September 2007, 2 months after activation on theInternational Space Station (ISS), the starboard Solar Alpha Rotary Joint(SARJ) reported that drive command current started increasing from a nominalpeak value of approximately 0.2 amps to a peak value of approximately 1.2 ampsin a period of 6 weeks. As the current increased, onboard accelerometermeasurements and visual observation of increased vibrations on the ISSstructure were a concern. Shortly afterthese increases in current and vibration, the decision was made to stop thestarboard SARJ from autotracking and avoid further rotations until the cause ofthe current increase could be determined. Operation of the port side SARJ wasnominal and was not interrupted.

Given the on-orbit observations, review of buildand test records, tests, analyses, and simulations performed, a most probable tribologicalSARJ anomaly root cause was established and is presented here. The kinematicsof the Trundle Bearing Assembly (TBA) and Drive Lock Assembly (DLA) mechanismsrequire that the roller thrust loads (related to friction coefficient andmistracking angle) be controlled to ensure stable roller line contact with therace ring surfaces. Inadequate lubrication of the roller/race ring interfacecombined with roller mistracking angles within specification resulted in thrustloads, high enough, to cause at least some of the TBA or DLA rollers to edgeload as the SARJ rotated. The rollerprofile geometry was not adequately controlled during the design phase. When a roller is edge loaded, the preload onthat roller is concentrated on a reduced contact area resulting in high contactstresses and shear stresses in the race ring case and core. These stresses exceeded the allowable bearingstrength capability of the race ring case and core, leading to brittle fractureand spalling of the nitrided layer from the starboard SARJ race ring.

===Biography:===

Carlos Enriquez obtained a B.S. Degree in Aerospace Engineering from the University of Arizona in 1989,
and a M.S. Degree in Technical Management from Embry Riddle University in 2001. Upon graduating
from the University of Arizona, Mr. Enriquez was hired by The Boeing Company to join the teams
developing the International Space Station, initially with the Guidance, Navigation and Control Team,
later joining the Structures and Mechanisms Team. During the development of the ISS, he participated
in the development of various mechanical attachment systems, which performed on-orbit assembly
operations by robotic berthing, EVA and docking to the ISS. He also participated in the development of
rotary mechanical systems, such as the Solar Alpha, and the Thermal Radiator Rotary Joints. Before
transitioning to NASA in 2021, he led the AITs for the NASA Docking System Block 1 (NDSB1) and the
International Space Station Rollout Solar Arrays (iROSA), from inception to hardware delivery. Currently,
Mr. Enriquez is the NASA Commercial Crew Structures and Mechanisms Manager.

==Video Presentation ==
{{#widget:Youtube
|id =ZY-ZWo-7GzA
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Tribology]]
[[Category:Wear]]

MediaWiki:Sidebar

2024-02-09T16:58:33Z

Jadmin:

Category:Newsletters

2024-02-09T16:57:58Z

Jadmin: Created page with "This initiative aims to keep us all updated on the latest advancements in our field and also provide visibility for our own contributions. We have created a very simple form you can fill with your article information: https://forms.gle/JjjYprPhv5XUr3W28 You just need to write the title and authors and select keywords from the checkbox. We will share the results in one month. If you want to include a non-published version, you could send it to us, and we will add it in..."

This initiative aims to keep us all updated on the latest advancements in our field and also provide visibility for our own contributions.

We have created a very simple form you can fill with your article information:
https://forms.gle/JjjYprPhv5XUr3W28

You just need to write the title and authors and select keywords from the checkbox. We will share the results in one month. If you want to include a non-published version, you could send it to us, and we will add it in our shared repository. In the same repository, you can find the Google sheet with the answers to the form, in case you want to access the information about recent research in our community before the newsletter is distributed.

Please take a moment to fill out the form with details about any articles you have published in the last few months.

We can't wait to share your valuable contributions with the broader community.

Main Page

2024-01-09T16:27:06Z

Jadmin: /* Next Seminar Series */

ISS Solar Alpha Rotary Joint Tribological Anomaly by Carlos Enriquez November 2023

2024-01-09T16:26:26Z

Jadmin:

{{DISPLAYTITLE:ISS Solar Alpha Rotary Joint Tribological Anomaly by Carlos Enriquez, January 2024}}
==ISS Solar Alpha Rotary Joint Tribological Anomaly==

Carlos Enriquez

NASA

November 28, 2023

===Abstract:===

In early September 2007, 2 months after activation on theInternational Space Station (ISS), the starboard Solar Alpha Rotary Joint(SARJ) reported that drive command current started increasing from a nominalpeak value of approximately 0.2 amps to a peak value of approximately 1.2 ampsin a period of 6 weeks. As the current increased, onboard accelerometermeasurements and visual observation of increased vibrations on the ISSstructure were a concern. Shortly afterthese increases in current and vibration, the decision was made to stop thestarboard SARJ from autotracking and avoid further rotations until the cause ofthe current increase could be determined. Operation of the port side SARJ wasnominal and was not interrupted.

Given the on-orbit observations, review of buildand test records, tests, analyses, and simulations performed, a most probable tribologicalSARJ anomaly root cause was established and is presented here. The kinematicsof the Trundle Bearing Assembly (TBA) and Drive Lock Assembly (DLA) mechanismsrequire that the roller thrust loads (related to friction coefficient andmistracking angle) be controlled to ensure stable roller line contact with therace ring surfaces. Inadequate lubrication of the roller/race ring interfacecombined with roller mistracking angles within specification resulted in thrustloads, high enough, to cause at least some of the TBA or DLA rollers to edgeload as the SARJ rotated. The rollerprofile geometry was not adequately controlled during the design phase. When a roller is edge loaded, the preload onthat roller is concentrated on a reduced contact area resulting in high contactstresses and shear stresses in the race ring case and core. These stresses exceeded the allowable bearingstrength capability of the race ring case and core, leading to brittle fractureand spalling of the nitrided layer from the starboard SARJ race ring.

===Biography:===

Carlos Enriquez obtained a B.S. Degree in Aerospace Engineering from the University of Arizona in 1989,
and a M.S. Degree in Technical Management from Embry Riddle University in 2001. Upon graduating
from the University of Arizona, Mr. Enriquez was hired by The Boeing Company to join the teams
developing the International Space Station, initially with the Guidance, Navigation and Control Team,
later joining the Structures and Mechanisms Team. During the development of the ISS, he participated
in the development of various mechanical attachment systems, which performed on-orbit assembly
operations by robotic berthing, EVA and docking to the ISS. He also participated in the development of
rotary mechanical systems, such as the Solar Alpha, and the Thermal Radiator Rotary Joints. Before
transitioning to NASA in 2021, he led the AITs for the NASA Docking System Block 1 (NDSB1) and the
International Space Station Rollout Solar Arrays (iROSA), from inception to hardware delivery. Currently,
Mr. Enriquez is the NASA Commercial Crew Structures and Mechanisms Manager.

==Video Presentation ==
{{#widget:Youtube
|id =
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]
[[Category:Tribology]]
[[Category:Wear]]

Summer Research Lightning Talks December 2023

2023-12-18T14:49:20Z

Jadmin: Created page with "{{DISPLAYTITLE:Summer Research Lightning Talks December 2023}} ==Summer Research Lightning Talks== We are excited to have five bright PhD students share their recent summer research projects with you: “Fielding Advance Diagnostics to Understand Joint Dynamics” by Khlid Alkady, University of Nebraska-Lincoln “Creation and Quantification of 3D Performance Surface FRFs.” by Caleb Bengs, Texas A&M "Effects of Non-Unique Residual Traction on the Non-Repeatability..."

{{DISPLAYTITLE:Summer Research Lightning Talks December 2023}}
==Summer Research Lightning Talks==

We are excited to have five bright PhD students share their recent summer research projects with you:

“Fielding Advance Diagnostics to Understand Joint Dynamics”
by Khlid Alkady, University of Nebraska-Lincoln

“Creation and Quantification of 3D Performance Surface FRFs.”
by Caleb Bengs, Texas A&M

"Effects of Non-Unique Residual Traction on the Non-Repeatability of the Dynamics of Jointed Structures"
by Arati Bhattu, Rice University

"A Practitioner’s Guide to FRF Estimation Using Local Modeling.”
by Keton Coletti, University of Georgia

"Nonlinear System Identification using Adaptive Chirp Mode Decomposition"
by Michael Lengger, Friedrich-Alexander University Erlangen-Nuremberg

If you are interested in applying to participate in, or potentially collaborating in next year's projects as a faculty mentor, the organizers of the research camps will be available after the end of the seminar to field any questions that you might have.

==Video Presentation ==
{{#widget:Youtube
|id =3yGPdcu1qyE
| height = 444
| width = 790
}}

[[Category:Seminar_Series]]

Category:File Sharing Repository

2023-12-18T14:35:58Z

Jadmin: Created page with "Temp"

Temp