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RESEARCH PAPERS: Modal Analysis

Identification of Mass, Damping, and Stiffness Matrices of Mechanical Systems

[+] Author and Article Information
Claus-Peter Fritzen

University of Kaiserslautern, Federal Republic of Germany

J. Vib., Acoust., Stress, and Reliab 108(1), 9-16 (Jan 01, 1986) (8 pages) doi:10.1115/1.3269310 History: Received June 17, 1985; Online November 23, 2009

Abstract

A procedure is presented to calculate the mass, damping, and stiffness matrices of mechanical systems from measured input/output data. It works on the basis of the Instrumental Variable Method which is well suited for the estimation of models from data with superimposed measurement noise. Noise is present in many practical cases. The theory of the method is described with regard to vibrating systems. The first application is the estimation of the matrices of a simulated system where the noise level is varied. The results show the expected properties: less sensitivity to noise compared to the Least Squares Method. Furthermore, the procedure is applied to a real system.

Copyright © 1986 by ASME
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