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The University of Southampton
Engineering

Inverse Eigenstructure Assignment by Means of Structural Modifications Seminar

Time:
12:00
Date:
15 March 2012
Venue:
B28/2001

Event details

Professor Huajiang Ouyang from the School of Engineering, University of Liverpool

Abstract

The inverse eigenstructure assignment in undamped vibrating systems aims at determining the mass and stiffness parameters to ensure the desired dynamic behaviour expressed in term of the prescribed eigenstructure. Several methods have been developed for the solution of this problem in the past. However, in the techniques proposed so far, all the design variables are assumed to be continuous. In practice, some design variables can only be changed through discrete modifications since either standard mass modules or springs are available. The determination of the discrete optimal solution of the structural modification problem cannot be performed by simply rounding the continuous optimal solution to the “nearest” integer, since rounded solutions can be considerably far from the optimality. To overcome this limitation, in this work, the eigenstructure assignment is formulated firstly as an inverse eigenvalue problem within the frame of constrained nonlinear integer programming, and then is solved by means of a partial enumeration technique. The experimental validation of the method on a five-degree-of-freedom lumped-parameter rig demonstrates its capability in computing the effective modifications meeting the prescribed requirements and satisfying all the constraints.
This work is the result of collaboration with Dr Gabriele Zanardo of Johannes Kepler University, Profs Alberto Trevisani and Dario Richiedei of University of Padua.

Biography

Prof. Huajiang Ouyang received BEng in Engineering Mechanics in 1982, MSc (MEng) in Solid Mechanics in 1985, and PhD in Structural Engineering in 1989, from Dalian University of Technology, China. He is Professor of Structural Dynamics and Control in the School of Engineering, University of Liverpool and a Royal Academy of Engineering and Leverhulme Trust Senior Research Fellow in 2009-2010. He is a Fellow of and Chair of the Applied Mechanics Group of the Institute of Physics. He is also a Subject Editor of Journal of Sound and Vibration. His current interests are moving-load dynamics and vibration control, structural identification, asymmetric systems such as squealing disc brakes, and uncertainty analysis.

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