Computational Modelling Group

Seminar  2nd August 2012 3 p.m.  Building 34, Room 2003

Stochastic Model Updating

Professor John Mottershead
University of Liverpool

Web page
http://tulip.liv.ac.uk/pls/new_portal/tulwwwmerge.mergepage?p_template=m_eg&p_tulipproc=staff&p_params=%3Fp_func%3Dteldir%26p_hash%3DA879678%26p_url%3DEG%26p_template%3Dm_eg
Submitter
Luke Goater

Prof. Mottershead

This is a gentle reminder about our invited seminar TODAY given by Prof. John Mottershead, Alexander Elder Professor of Applied Mechanics, Head of the Centre for Engineering Dynamics from University of Liverpool.

Stochastic model updating methods are described, including probabilistic perturbation methods, interval techniques and Bayesian inference. Particular attention is paid to aleatory uncertainty such as variability in nominally identical test structures due to manufacturing tolerances. In such cases the updating parameter distributions are meaningful physically either as PDFs or as intervals. Stochastic model updating is an inverse problem, generally requiring multiple forward solutions. The use of meta-models (response-surface mapping techniques and the Kriging predictor) as surrogates for the full FE model are explained. The procedure is illustrated in each case by experimental examples, including

(1) model updating of a structure with uncertain locations of two internal beams and

(2) the DRL AIRMOD structure, a replica of the GARTEUR SM-AG14 testbed, which was disassembled and reassembled over eighty times with a modal test carried out at each reassembly.

Selected relevent papers:

  1. H. Haddad Khodaparast, J.E. Mottershead and M.I. Friswell, Perturbation methods for the estimation of parameter variability in stochastic model updating, Mechanical Systems and Signal Processing, 22(8), 2008, 1751-1773.

  2. H. Haddad Khodaparast, J.E. Mottershead and K.J. Badcock, Interval model updating with irreducible uncertainty using the Kriging predictor, Mechanical Systems and Signal Processing, 25(4), 2011, 1204-1226.

  3. R.P. Dwight, H. Haddad Khodaparast and J.E. Mottershead, Identifying structural variability using Bayesian inference, International Conference on Uncertainty in Structural Dynamics, Leuven, Belgium, September 17-19, 2012, paper 82.

  4. H. Haddad Khodaparast, J. E. Mottershead, Y. Govers and M. Link, Interval model updating of the AIRMAD structure , International Conference on Uncertainty in Structural Dynamics, Leuven, Belgium, September 17-19, 2012, paper 175

Biographical note:

John Mottershead is the Alexander Elder Professor of Applied Mechanics at Liverpool University, Head of the Centre for Engineering Dynamics and Associate Editor of Mechanical Systems and Signal Processing. He is the author of several hundred papers in international journals and conferences, and eleven plenary keynote papers including the USA and China. Professor Mottershead is the first author of an extensive survey paper on Finite Element Model Updating and co-author of a research monograph on model updating, the only book in the field. His present research interests include (1) stochastic model updating, (2) active vibration control and (3) image processing of full-field vibration and strain data.