Finite element model updating using in-situ experimental data

Meggitt, JWR ORCID: https://orcid.org/0000-0002-6665-2939 and Moorhouse, AT ORCID: https://orcid.org/0000-0002-4034-1091 2020, 'Finite element model updating using in-situ experimental data' , Journal of Sound and Vibration , p. 115675.

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Abstract

Conventional model updating methods are based on frequency response functions (FRFs) and/or modal parameters estimates obtained from freely suspended, or sometimes rigidly constrained, sub-structures. These idealised boundary conditions are however often difficult to realise in a practical scenario. Furthermore, they are in conflict with the requirement that the sub-structure should also be measured whilst under a representative mounting condition. This paper addresses the question whether model updating can be achieved in the presence of an arbitrary or unknown boundary condition using in-situ measurements, i.e. without removing the sub-structure from its assembly. It is shown that some measurable properties, dynamic transfer stiffness and generalised transmissibility, are invariant to sub-structural boundary conditions and can therefore be obtained in-situ. It is further shown that, with minor adaption, existing transmissibility-based updating methods can be applied more widely than previously thought; to sub-structures whose boundary conditions are non-ideal. The theory is verified by a numerical beam example. Application to a resilient isolator is then demonstrated where a finite element model is successfully updated without removing the isolator from its assembly.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering > Salford Innovation Research Centre
Journal or Publication Title: Journal of Sound and Vibration
Publisher: Elsevier
ISSN: 0022-460X
Related URLs:
Depositing User: JWR Meggitt
Date Deposited: 27 Aug 2020 13:07
Last Modified: 02 Oct 2020 08:45
URI: http://usir.salford.ac.uk/id/eprint/58072

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