Measuring strain response mode shapes with a continuous-scan LDV

Anthony B. Stanbridge; Milena Martarelli; David J. Ewins

doi:10.1117/12.386744

22 May 2000 Measuring strain response mode shapes with a continuous-scan LDV

Anthony B. Stanbridge, Milena Martarelli, David J. Ewins

Proceedings Volume 4072, Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2000) https://doi.org/10.1117/12.386744
Event: 4th International Conference on Vibration Measurement by Laser Techniques, 2000, Ancona, Italy

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.

Citation Download Citation

Anthony B. Stanbridge, Milena Martarelli, and David J. Ewins "Measuring strain response mode shapes with a continuous-scan LDV", Proc. SPIE 4072, Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2000); https://doi.org/10.1117/12.386744

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