On the completeness of interface descriptions and the consistency of blocked forces obtained in-situ

Meggitt, JWR ORCID: https://orcid.org/0000-0002-6665-2939 and Moorhouse, AT ORCID: https://orcid.org/0000-0002-4034-1091 2020, 'On the completeness of interface descriptions and the consistency of blocked forces obtained in-situ' , Mechanical Systems and Signal Processing, 145 , p. 106850.

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Abstract

Blocked forces can be used to describe, independently, the operational characteristics of a vibratory source. Their use within a computational model avoids the need to represent explicitly the complex mechanisms that lead to vibratory excitation. To obtain and apply an experimental blocked force with confidence it is important that likely sources of error are known, and measures of their severity are available. In this paper we introduce the notions of completeness and consistency, and detail their role in the introduction of systematic errors in a blocked force characterisation. Their mathematical origins are described and criteria to quantify their severity are proposed; the Interface Completeness Criterion (ICC), and the Measurement Consistency Criterion (MCC). These are illustrated through numerical and experimental examples. Completeness is related to the interface description adopted in a source characterisation (i.e. the number of degrees of freedom used). The ICC represents the quality of an interface description and can be quantified from in-situ measurements, i.e without having to remove the source from its assembly. Consistency is related to the underlying dynamics shared by active and passive quantities (whether measured or modelled). The issue of consistency is more general, completeness being a special case, and so a single criterion is hard to formulate. When an inconsistency arises between the blocked force of a vibration source and its corresponding free interface frequency response function matrix, the MCC provides a quantitative indication of its severity. Importantly, many of the concepts discussed apply equally in the context of experimental dynamic sub-structuring.

Item Type: Article
Schools: Schools > School of Arts & Media > Arts, Media and Communication Research Centre
Journal or Publication Title: Mechanical Systems and Signal Processing
Publisher: Elsevier
ISSN: 0888-3270
Related URLs:
Funders: Engineering and Physical Sciences Research Council (EPSRC)
Depositing User: JWR Meggitt
Date Deposited: 25 Mar 2020 15:21
Last Modified: 14 May 2020 08:01
URI: http://usir.salford.ac.uk/id/eprint/56733

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