Mass, Stiffness, and Damping Matrix Identification: An Integrated Approach

[+] Author and Article Information
M. J. Roemer

Lord Corporation, 1635 West 12th Street, Erie, PA 10039

D. J. Mook

Dept. of Mechanical and Aerospace Engineering, State University of NY at Buffalo, Buffalo, NY 14260

J. Vib. Acoust 114(3), 358-363 (Jul 01, 1992) (6 pages) doi:10.1115/1.2930270 History: Received October 01, 1989; Online June 17, 2008


Accurate estimates of the mass, stiffness, and damping characteristics of a structure are necessary for determining the control laws best suited for active control methodologies. There are several modal identification techniques available for determining the frequencies, damping ratios, and mode shapes of a structure. However, modal identification methods in both the frequency and time domains have difficulties for certain circumstances. Frequency domain techniques which utilize the steady-state response from various harmonic inputs often encounter difficulties when the frequencies are closely distributed, the structure exhibits a high degree of damping, or the steady-state condition is hard to establish. Time domain techniques have produced successful results, but lack robustness with respect to measurement noise. In this paper, two identification techniques and an estimation method are combined to form a time-domain technique to accurately identify the mass, stiffness, and damping matrices from noisy measurements.

Copyright © 1992 by The American Society of Mechanical Engineers
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