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Proceedings Paper

Measuring strain response mode shapes with a continuous-scan LDV
Author(s): Anthony B. Stanbridge; Milena Martarelli; David J. Ewins
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Paper Abstract

A continuous-scan LDV can be used to give the response mode shape (of a vibrating surface as a spatial polynomial series. Second spatial derivative(s) of the deflection equation are then easily derived, and these should, in principle, give a curvature equation from which, for a beam or plate of known cross-section, stresses and strains can be obtained. Unfortunately, the stress and strain distributions depend critically on higher terms in the series, which are not accurately measured. This problem is avoided by a method described in this paper, which enables accurate stress and strain distributions to be derived for uniform beams, from a straight-line LDV scan, using only five terms in the mode- shape polynomial series. An application to uniform plates is being developed; the analysis in this latter case is rather more complicated.

Paper Details

Date Published: 22 May 2000
PDF: 9 pages
Proc. SPIE 4072, Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2000); doi: 10.1117/12.386744
Show Author Affiliations
Anthony B. Stanbridge, Imperial College of Science, Technology and Medicine (United Kingdom)
Milena Martarelli, Imperial College of Science, Technology and Medicine (Italy)
David J. Ewins, Imperial College of Science, Technology and Medicine (United Kingdom)


Published in SPIE Proceedings Vol. 4072:
Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications

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