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

journal contribution
posted on 2023-06-07, 20:35 authored by Julian DunneJulian Dunne, L W Dunne
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.

History

Publication status

  • Published

Journal

Journal of Sound and Vibration

ISSN

0022-460X

Issue

1-2

Volume

322

Page range

98-134

Pages

36.0

Department affiliated with

  • Engineering and Design Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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