A Time-Domain Method for Identifying Modal Parameters

[+] Author and Article Information
Zhen-ni Wang

Beijing University of Aeronautics and Astronautics, Beijing, China

Tong Fang

Duke University, Durham, NC 27706

J. Appl. Mech 53(1), 28-32 (Mar 01, 1986) (5 pages) doi:10.1115/1.3171732 History: Received November 08, 1984; Revised May 08, 1985; Online July 21, 2009


A time-domain method for identifying the modal parameters of a vibration system is presented. It is shown that system eigenvectors can be effectively estimated through the multivariate AR model representation of the system response to white noise excitation. In contrast to the usual ARMA model approach, in this method only a linear least square algorithm is required, so that a great amount of calculation is saved. Results of digital simulations support the identification method.

Copyright © 1986 by ASME
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