An FRF Bounding Method for Randomly Uncertain Structures with or without Coupling to an Acoustic Cavity

Dunne, J F and Dunne, L W (2009) An FRF Bounding Method for Randomly Uncertain Structures with or without Coupling to an Acoustic Cavity. Journal of Sound and Vibration, 322 (1-2). pp. 98-134. ISSN 0022-460X

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Abstract

An efficient frequency response function (FRF) bounding method is proposed using asymptotic extreme-value theory. The method exploits a small random sample of realised FRFs obtained from nominally identical structures to predict corresponding FRF bounds for a substantially larger batch. This is useful for predicting forced-vibration levels in automotive vehicle bodies when parameters are assumed to vary statistically. Small samples are assumed to come either from Monte Carlo simulation using a vibration model, or via measurements from real structures. The basis of the method is to undertake a hypothesis test and if justified, repeatedly fit inverted Type I asymptotic threshold exceedance models at discrete frequencies, for which the models are not locked to a block size (as in classical extreme-value models). The chosen FRF `bound is predicted from the inverse model in the form of the `m-observational return level, namely the level that will be exceeded on average once in every m structures realised.

Item Type: Article
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Depositing User: Julian Dunne
Date Deposited: 06 Feb 2012 18:34
Last Modified: 13 Mar 2017 11:04
URI: http://sro.sussex.ac.uk/id/eprint/17205

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