Damping in Built Up Structures Hugh Goyder March82022

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.