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Modal parameter estimation from base excitation

✍ Scribed by J.-G. Béliveau; F.R. Vigneron; Y. Soucy; S. Draisey

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
725 KB
Volume
107
Category
Article
ISSN
0022-460X

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✦ Synopsis

Current software packages used for modal parameter identification are based on measured frequency response of either a fixed structure having no rigid body modes or a free structure with flexible supports. Procedures are now available to extract complex modes with the usual assumptions that the mass, stiffness and damping matrices are symmetric. In the case of base excitation, the equations of structural dynamics involve relative displacement with respect to the base, rather than with respect to the inertial frame of reference. Measurements, usually in the form of acceleration, are, however, for the total response. In this paper, a procedure is outlined for obtaining modal information from total acceleration measurements for the case of base excitation using current software capabilities. The frequency response of the acceleration measurements must be modified algebraically before parameter estimation is performed. Once this is done, however, the modal testing procedure remains the same as for the other experimental setups.

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