Spatial Domain Modal Analysis of Lightly-Damped Structures Using Laser Velocimeters

[+] Author and Article Information
J. R. F. Arruda

Departamento de Mecânica Computacional, Universidade Estadual de Campinas, Caixa Postal 6122, Campinas, SP 13081, Brazil

J. Vib. Acoust 115(3), 225-231 (Jul 01, 1993) (7 pages) doi:10.1115/1.2930337 History: Received August 01, 1991; Revised June 01, 1992; Online June 17, 2008


Traditional modal identification techniques do not take advantage of the high spatial density of scanning Laser Doppler Velocimeter (LDV) measurements. In this paper, a spatial modal parameter estimation technique, specially adapted for use with LDV measurements, is presented. It is based on a real-mode modal filtering concept and, therefore, is applicable to structures with low damping. From the estimated mode shape surfaces, curve-fitted with two-dimensional Fourier series, angular displacements are calculated. A rectangular plate example illustrates the proposed techniques with both numerically simulated and experimental results.

Copyright © 1993 by The American Society of Mechanical Engineers
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