Joints Committee - User contributions [en]

The Beauty of Substructuring and Characterization of linear interface dynamics Rixen May2023

2023-05-23T18:57:59Z

Msbonney:

{{DISPLAYTITLE:The beauty of Substructuring and characterization of linear interface dynamics by Prof. Daniel Rixen and Francesco Trainotti, May 2023}}
==The beauty of Substructuring and characterization of linear interface dynamics==

Prof. Daniel Rixen and Francesco Trainotti

Technical University of Munich

May, 2023

===Abstract:===

In this seminar, we will discuss the concept of coupling and decoupling of substructures, discuss what problems occur when applying substructuring with measured components and what tricks can help getting good results from such Frequency-Based Substructuring approaches. We will then discuss how substructuring can be used to find the dynamic properties of linear interfaces and show results on a simple example.

===Biography:===

Francesco Trainotti is an engineer and PhD student at the Chair of Applied Mechanics at the Technical University of Munich, where he has been working since 2019. He conducts academic and industrial research in the areas of experimental and numerical structural dynamics, vibration analysis, and systems identification. He received his Bachelor's Degree in Industrial Engineering from the University of Trento (IT) in 2015, followed by a double Master's Degree in Mechatronics from the University of Trento (IT) and in Mechanical Engineering from the Technical University of Munich (DE) in 2018.

Daniel Rixen, (b. 1967) received his engineering degree (electro-mechanics) from the University of Liège (ULg, Belgium) and an MSc degree in Aerospace Vehicle Design from the College of Aeronautics in Cranfield (UK). He obtained his doctorate degree from ULg in 1997, supervised by Professor Géradin. After a research assistantship at the Center for Aerospace of the University of Colorado (USA), he became in 2000 a full professor at Delft University of Technology (The Netherlands) where he held the Chair of Engineering Dynamics. Since 2012 he is heading the Department of Applied Mechanics at TUM. Daniel has worked for more than twenty five years on theoretical, numerical and experimental aspects of the dynamics of structures and systems. His activities encompass simulations and measurements of vibrations as well as domain decomposition for parallel computing, modelling of multiphysical systems, model reduction techniques and robotics.

==Video Presentation ==
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[[Category:Seminar_Series]]

Malte Krack March 2023

2023-03-28T19:39:33Z

Msbonney: Blanked the page

Malte Krack March 2023

2023-03-28T19:37:26Z

Msbonney: Created page with "{{DISPLAYTITLE:Nonlinear Modes of Jointed Structures by Malte Krack, March 2023}} ==Nonlinear Modes of Jointed Structures== Malte Krack, University of Stuttgart, Germany March 2023 ===Abstract:=== Normal modes characterize the vibration signature and simplify the quantitative analysis of the vibration response. Most work on nonlinear modes has focused on conservative, smooth systems. This stands in polar opposite to the dissipative, inherently non-smooth frictional..."

{{DISPLAYTITLE:Nonlinear Modes of Jointed Structures by Malte Krack, March 2023}}
==Nonlinear Modes of Jointed Structures==

Malte Krack,

University of Stuttgart, Germany

March 2023

===Abstract:===
Normal modes characterize the vibration signature and simplify the quantitative analysis of the vibration response. Most work on nonlinear modes has focused on conservative, smooth systems. This stands in polar opposite to the dissipative, inherently non-smooth frictional contact interactions within joints. In the past decade, the Extended Periodic Motion Concept has proven itself as a useful definition for nonlinear modes in that case. This tutorial covers this concept, computational and experimental methods, single-nonlinear-mode theory, and nonlinear-mode-based reduced order modeling. Opportunities and limitations for the application to friction damping of turbine blades are demonstrated. Recent progress is also shown on fluid-structure interaction, substructuring and the effects of non-unique residual traction.

===Biography:===

Malte Krack obtained his doctoral degree in Mechanical Engineering at the University of Hannover, Germany, in 2014. In 2015 he joined Alexander Vakakis' group at the University of Illinois at Urbana-Champaign as a postdoctoral research fellow. In 2016, he was appointed as tenure-tracked professor at the University of Stuttgart in the Aerospace Engineering Department, where he became full professor in 2021. His primary research area is the nonlinear vibrations of structures subjected to contact nonlinearities. Activities span the range from the fundamental development of computational and experimental methods to application-oriented projects on friction damping and impact absorbers with the German turbomachinery industry.

==Video Presentation ==
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[[Category:Seminar_Series]]

James Winkel Nov 2022

2022-11-08T16:39:34Z

Msbonney: Created page with "{{DISPLAYTITLE:Dynamic Finite Element Model Correlation by James Winkel, Nov. 8, 2022}} ==Dynamic Finite Element Model Correlation== James Winkel NASA Langley Research Center November 8, 2022 ===Abstract:=== A critical task involved with being able to predict flight loads accurately in complex aerospace finite element models (FEMs) is the prior verification of the models by conducting modal survey testing (MST). Experience in comparing the dynamic response of initial..."

{{DISPLAYTITLE:Dynamic Finite Element Model Correlation by James Winkel, Nov. 8, 2022}}
==Dynamic Finite Element Model Correlation==

James Winkel

NASA Langley Research Center

November 8, 2022

===Abstract:===
A critical task involved with being able to predict flight loads accurately in complex aerospace finite element models (FEMs) is the prior verification of the models by conducting modal survey testing (MST). Experience in comparing the dynamic response of initial un-correlated FEMs to MST data tends to demonstrate that FEMs can have unacceptable accuracy even when best modeling practices are followed. One inherent source of inaccuracy in linear dynamic FEMs is the modeling of joints and interfaces, some of which exhibit non-linear behavior. The focus of this discussion will be trying to guide the listener through the critical items to consider when preparing to undertake the correlation of a finite element model using MST data. Examples will be presented of some of the common issues and over-looked items that make model correlation more difficult than necessary. Finally, a discussion on potential approaches to best approximate localized non-linear behaving interfaces in the linear finite element models will conclude the presentation.

===Biography:===

James has worked at NASA for over 12 years, specifically in the fields of structural dynamic testing and finite element correlation. He has had the opportunity to test and correlate hardware for Orion, SLS, and the Boeing Starliner, as well as others NASA programs, such as the X57 Maxwell electric aircraft. He received his bachelor’s degree in Aerospace Engineering from Wichita State University in Wichita, Kansas and later his master’s degree from Purdue University. He lives in Virginia Beach with his wife Danielle and two dogs. He was fortunate enough growing up to be able to work in the family manufacturing business where he developed a passion for understanding how various equipment works and most importantly how structures react to unplanned/unexpected loads (education is expensive no matter how you get it).

==Video Presentation ==
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[[Category:Seminar_Series]]

Balaji NLQSMA

2022-06-14T15:23:04Z

Msbonney: Created page with "{{DISPLAYTITLE:Modal Analysis for Nonlinear Dynamics: Quasi-Static Perspectives for Dissipative Dynamics by Dr. Nidish Balaji, June 2022}} ==Modal Analysis for Nonlinear Dynamics: Quasi-Static Perspectives for Dissipative Dynamics== Dr. Nidish Balaji Rice University, Houston, Texas, USA June 14, 2022 ===Abstract:=== The talk is designed to be a tutorial introduction to the general area of Quasi-Static Nonlinear Modal Analysis (QSNMA), which involves the employment..."

{{DISPLAYTITLE:Modal Analysis for Nonlinear Dynamics: Quasi-Static Perspectives for Dissipative Dynamics by Dr. Nidish Balaji, June 2022}}
==Modal Analysis for Nonlinear Dynamics: Quasi-Static Perspectives for Dissipative Dynamics==

Dr. Nidish Balaji

Rice University, Houston, Texas, USA

June 14, 2022

===Abstract:===

The talk is designed to be a tutorial introduction to the general area of Quasi-Static Nonlinear Modal Analysis (QSNMA), which involves the employment of Quasi-Static (QS) computational approaches for the near-resonant characterization of nonlinear systems. It will start with a brief historical overview of the concept of Nonlinear Modal Analysis (NMA), followed by a discussion of which concepts from linear dynamics naturally generalize to the nonlinear case and which do not. Undamped and damped (decaying) periodic motion concepts will be highlighted in order to serve as a backdrop for the remainder of the talk. The single nonlinear mode theory will be invoked as a general motivation. Next, the Quasi-Static Modal Analysis (QSMA) approach will be introduced using undamped linear dynamics as a point of departure. Its distinctiveness will be brought out through a discussion of merits and demerits in comparison to periodic motion concepts. As a successor in spirit, the Rayleigh Quotient-based Nonlinear Modal Analysis (RQNMA) approach will be presented from a constrained work stationarity standpoint. The resulting formulation will be discussed in relation to both QSMA and the periodic motion concepts. This will be followed by outlines of two broad areas of ongoing research in QSNMA: (1) The additional considerations necessary for the study of dissipative dynamics; and (2) the effect of the co-existence of multiple modes on the modal characteristics. Both of these will be presented with an intention to generate debate and discussion. The talk will finally conclude with a summary of the key gaps identified in the area of quasi-static nonlinear modal analysis in comparison with other computational approaches in the literature.

===Biography:===

Dr. Nidish Balaji received his Ph.D. from Rice University in 2021 under the guidance of Prof. Matthew Brake. His dissertation research focused on Tribomechadynamics – the efficient and accurate modeling of the physics and nonlinear dynamics of a jointed structure. Since graduating, Dr. Balaji has been a postdoc under both Prof. Brake and Prof. Chris Jermaine, with a research focus on using data driven methods to enhance digital image correlation measurements. Later this year, Dr. Balaji will start a new postdoc position at the University of Stuttgart as a Humboldt Research Fellow under the mentorship of Prof. Malte Krack.

==Video Presentation ==
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[[Category:Seminar_Series]]

Damping in Built Up Structures Hugh Goyder March82022

2022-03-08T17:02:14Z

Msbonney: /* Video Presentation */

{{DISPLAYTITLE:Hugh Goyder Seminar March 8, 2022}}
==Damping in Built-Up Structures==

Hugh Goyder

Cranfield University, Shrivenham, UK

March 8, 2022

===Abstract:===

The vibration of structures is all about mass, stiffness and damping. While the behaviour of mass and stiffness is well known damping continues to be unpredictable, difficult to model and poorly understood. The first part of this talk will be an introduction to damping and will show why even if it is linear and, in principle easy to model, it still presents difficulties. This is particularly true if damping associated with specific locations, for example connection between components of a built-up structure need to be modelled. The second part of this talk will look at a novel method for measuring damping that is applicable for linear or nonlinear structures. Here the focus will be on how to obtain accurate measurements of damping. An extension of standard experimental modal analysis will be demonstrated. Surprisingly although nonlinear structures are being considered the fitting of models can employ linear methods.

===Biography:===

Dr Hugh Goyder is a specialist in experimental and theoretical dynamics. He gained his PhD from the Institute of Sound and Vibration Research at Southampton University in 1978 where he studied problems of structure borne sound in built-up structures. Hugh then worked on flow-induced vibration in civil nuclear power at the Atomic Energy Research Establishment Harwell. Here he also worked on non-linear vibration, acoustics and fluid dynamics problems in process plant. Since leaving Harwell he has worked at Cranfield University where he continues to undertake research into vibration and fluid dynamics problems including ballistics and gun dynamics. He is the chairman of the NAFEMS Dynamics and Testing Working Group and active in various special interest groups concerned with vibration.

==Video Presentation ==
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|id =oy3Ahnicu8Q
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| width = 790
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[[Category:Seminar_Series]]

TMD2021

2021-08-24T13:01:59Z

Msbonney: /* Early Career Event */

==Monday, August 2nd==
*8:30 am – 12:30 pm CDT (GMT-5): Contact Modeling Workshop, hosted by Abaqus

==Tuesday, August 3rd==
===Session 1===
{{#widget:Youtube
|id = A24nhPosLWk
| height = 444
| width = 790
}}
*Welcome Address
*Alfredo Fantetti, Imperial College London, “A round-robin test to measure friction hysteresis measurements on two different fretting rigs at Politecnico di Torino and Imperial College London”
*Matt de Brett, Imperial College London, “Measurement of the damping effect of a seal wire on turbine blade vibration”
*Matias Lasen, Imperial College London, “Control of tangential stiffness and friction damping modifying contact interfaces with piezoelectrics”
*Tong Wei, Imperial College London, “Quantitative optical measurements to investigate the real area of contact in a PMMA to PMMA joint”
*Antonio Papangelo, Politecnico di Bari, “Self-excited vibrations in soft sliding viscoelastic contacts”
===Discussion Session 1===
{{#widget:Youtube
|id = flHFrklPO18
| height = 444
| width = 790
}}
:Data-driven versus physics-driven modeling? Are there opportunities for ML in joints research, or is it all hype?
:Panelists: Keith Worden, …
:Moderator: Matthew Brake
===Senior Keynote===
{{#widget:Youtube
|id = OR-U2004fjE
| height = 444
| width = 790
}}
:Rob Carpick, University of Pennsylvania, “New insights into friction and wear from nanoscale in-situ approaches”

==Wednesday, August 4th==
===Session 2===
{{#widget:Youtube
|id = 16pnyRz4AWg
| height = 444
| width = 790
}}
*Daily Overview
*Wolfgang Witteveen, University of Applied Sciences Upper Austria, “Self-excited vibrations in soft sliding viscoelastic contacts”
*Drithi Shetty, University of Wisconsin, Madison, “Predicting Nonlinearity in the Benchmark Structure using QSMA and SICE”
*Aabhas Singh, University of Wisconsin, Madison, “Multi-mode quasi-static excitation for systems with nonlinear joints”
*Yekai Sun, University of Strathclyde, “On the comparison of different methodologies for the computation of damped nonlinear normal modes and resonance prediction of systems with non-conservative nonlinearities”
*Nidish Balaji, Rice University, “Stochastic perspectives on the nonlinear resonance of bolted joints”
===TMD Research Challenge===
{{#widget:Youtube
|id = OIoZaACtyRk
| height = 444
| width = 790
}}
*Tribomechadynamics Research Challenge Discussion and Overview
:Malte Krack, University of Stuttgart
===Student Paper Competition===
{{#widget:Youtube
|id = w-9Zp5haXDU
| height = 444
| width = 790
}}
* Zhen-Wah Chew, National Chung Hsing University, “Identification of contact zones of receding contact using image processing techniques”
*Shuyang Zhang, KU Leuven, “A model order reduction method for the dynamic simulation of bolt joints considering contact nonlinearity”
*Michael Lengger, Friedrich-Alexander Universitat Erlangen-Nurnberg, “Application of quasi-static modal analysis to the Tribomechadynamics benchmark system”
===Early Career Event===
{{#widget:Youtube
|id = yaja9fWczXU
| height = 444
| width = 790
}}
:What comes next? A mentorship panel Q&A session on preparing for life after graduation (or your next move).
:Panelists: Matthew Bonney, Matthew Brake, Malte Krack, Daniel Roettgen

==Thursday, August 5th==
===Session 3===
{{#widget:Youtube
|id = V5Qf-9VQErQ
| height = 444
| width = 790
}}
*Daily Overview
*Hugh Goyder, Cranfield University, “Some signal processing methods for experimental modal analysis of non-linear structures”
*Hassan Jalali, Northumbria University, “Blind prediction of the displacement-dependent dynamic properties of a JFJF plate with uncertain parameters”
*Michael Kuts, Bauman Moscow State Technical University, “Dynamic properties of filled bolted joints”
*Matthew Bonney, Sheffield University, “Temperature FEA modelling of connected mismatched materials”
*Justin Porter, Rice University, “A rough contact modeling framework for arbitrarily varying normal pressure”
===Discussion Session 2===
{{#widget:Youtube
|id = 6iwH6IJRvfU
| height = 444
| width = 790
}}
:Modal hysteresis modeling: A red herring or part of the path forward for modeling jointed structures?
:Panelists: Matt Allen, Matthew Brake, Malte Krack
:Moderator: Christoph Schwingshackl
===Junior Keynote===
{{#widget:Youtube
|id = Y5_dW-omNyc
| height = 444
| width = 790
}}
:Chiara Gastaldi, Politecnico di Torino, “Designing with and for friction: unexpected findings and things to remember”

TMD2021

2021-08-24T13:01:13Z

Msbonney: /* Early Career Event */

==Monday, August 2nd==
*8:30 am – 12:30 pm CDT (GMT-5): Contact Modeling Workshop, hosted by Abaqus

==Tuesday, August 3rd==
===Session 1===
{{#widget:Youtube
|id = A24nhPosLWk
| height = 444
| width = 790
}}
*Welcome Address
*Alfredo Fantetti, Imperial College London, “A round-robin test to measure friction hysteresis measurements on two different fretting rigs at Politecnico di Torino and Imperial College London”
*Matt de Brett, Imperial College London, “Measurement of the damping effect of a seal wire on turbine blade vibration”
*Matias Lasen, Imperial College London, “Control of tangential stiffness and friction damping modifying contact interfaces with piezoelectrics”
*Tong Wei, Imperial College London, “Quantitative optical measurements to investigate the real area of contact in a PMMA to PMMA joint”
*Antonio Papangelo, Politecnico di Bari, “Self-excited vibrations in soft sliding viscoelastic contacts”
===Discussion Session 1===
{{#widget:Youtube
|id = flHFrklPO18
| height = 444
| width = 790
}}
:Data-driven versus physics-driven modeling? Are there opportunities for ML in joints research, or is it all hype?
:Panelists: Keith Worden, …
:Moderator: Matthew Brake
===Senior Keynote===
{{#widget:Youtube
|id = OR-U2004fjE
| height = 444
| width = 790
}}
:Rob Carpick, University of Pennsylvania, “New insights into friction and wear from nanoscale in-situ approaches”

==Wednesday, August 4th==
===Session 2===
{{#widget:Youtube
|id = 16pnyRz4AWg
| height = 444
| width = 790
}}
*Daily Overview
*Wolfgang Witteveen, University of Applied Sciences Upper Austria, “Self-excited vibrations in soft sliding viscoelastic contacts”
*Drithi Shetty, University of Wisconsin, Madison, “Predicting Nonlinearity in the Benchmark Structure using QSMA and SICE”
*Aabhas Singh, University of Wisconsin, Madison, “Multi-mode quasi-static excitation for systems with nonlinear joints”
*Yekai Sun, University of Strathclyde, “On the comparison of different methodologies for the computation of damped nonlinear normal modes and resonance prediction of systems with non-conservative nonlinearities”
*Nidish Balaji, Rice University, “Stochastic perspectives on the nonlinear resonance of bolted joints”
===TMD Research Challenge===
{{#widget:Youtube
|id = OIoZaACtyRk
| height = 444
| width = 790
}}
*Tribomechadynamics Research Challenge Discussion and Overview
:Malte Krack, University of Stuttgart
===Student Paper Competition===
{{#widget:Youtube
|id = w-9Zp5haXDU
| height = 444
| width = 790
}}
* Zhen-Wah Chew, National Chung Hsing University, “Identification of contact zones of receding contact using image processing techniques”
*Shuyang Zhang, KU Leuven, “A model order reduction method for the dynamic simulation of bolt joints considering contact nonlinearity”
*Michael Lengger, Friedrich-Alexander Universitat Erlangen-Nurnberg, “Application of quasi-static modal analysis to the Tribomechadynamics benchmark system”
===Early Career Event===
{{#widget:Youtube
|id = yaja9fWczXU
| height = 444
| width = 790
}}
:What comes next? A mentorship panel Q&A session on preparing for life after graduation (or your next move).
:Panelists: Matthew Bonney, Matthew Brake, Malte Krack, Dan Roettgen

==Thursday, August 5th==
===Session 3===
{{#widget:Youtube
|id = V5Qf-9VQErQ
| height = 444
| width = 790
}}
*Daily Overview
*Hugh Goyder, Cranfield University, “Some signal processing methods for experimental modal analysis of non-linear structures”
*Hassan Jalali, Northumbria University, “Blind prediction of the displacement-dependent dynamic properties of a JFJF plate with uncertain parameters”
*Michael Kuts, Bauman Moscow State Technical University, “Dynamic properties of filled bolted joints”
*Matthew Bonney, Sheffield University, “Temperature FEA modelling of connected mismatched materials”
*Justin Porter, Rice University, “A rough contact modeling framework for arbitrarily varying normal pressure”
===Discussion Session 2===
{{#widget:Youtube
|id = 6iwH6IJRvfU
| height = 444
| width = 790
}}
:Modal hysteresis modeling: A red herring or part of the path forward for modeling jointed structures?
:Panelists: Matt Allen, Matthew Brake, Malte Krack
:Moderator: Christoph Schwingshackl
===Junior Keynote===
{{#widget:Youtube
|id = Y5_dW-omNyc
| height = 444
| width = 790
}}
:Chiara Gastaldi, Politecnico di Torino, “Designing with and for friction: unexpected findings and things to remember”