Component replacement TPA : a transmissibility-based structural modification method for in-situ transfer path analysis

Meggitt, JWR ORCID: https://orcid.org/0000-0002-6665-2939, Elliott, AS ORCID: https://orcid.org/0000-0003-4894-0053, Moorhouse, AT ORCID: https://orcid.org/0000-0002-4034-1091, Jalibert, A and Franks, G 2021, 'Component replacement TPA : a transmissibility-based structural modification method for in-situ transfer path analysis' , Journal of Sound and Vibration, 499 , p. 115991.

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Abstract

In-situ Transfer Path Analysis is a diagnostic method used to analyse the propagation of noise and vibration through complex built-up structures. Its defining feature is the invariant characterisation of an assembly’s active components (i.e. vibration sources) by their blocked forces. This invariant characterisation enables the downstream structural modification of an assembly without affecting the sources’ operational characteristics. In practical engineering structures, however, there is often a need to alter or replace components that reside within a vibration source, for example resilient mounts. An upstream structural modification of this sort would alter the blocked force and thus invalidate any response predictions made thereafter. Hence, an alternative approach is required. In the present paper a transmissibility-based structural modification method is introduced. We derive a set of equations that relate the blocked force and forward transfer functions obtained from an initial assembly, to those of an upstream modified assembly. Exact formulations are provided, together with first and zeroth order approximations for resiliently coupled structures. These component replacement expressions are verified by numerical examples.

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:
Funders: Engineering and Physical Sciences Research Council (EPSRC)
Depositing User: JWR Meggitt
Date Deposited: 29 Jan 2021 09:01
Last Modified: 01 Mar 2021 12:45
URI: http://usir.salford.ac.uk/id/eprint/59434

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