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RESEARCH PAPERS: Vibration and Sound

A Unified Theory of Recursive, Frequency Domain Filters With Application to System Identification in Structural Dynamics

[+] Author and Article Information
J. E. Mottershead

Department of Mechanical Engineering, University of Liverpool, P.O. Box 147, Liverpool L69 3BX United Kingdom

J. Vib., Acoust., Stress, and Reliab 110(3), 360-365 (Jul 01, 1988) (6 pages) doi:10.1115/1.3269526 History: Received March 31, 1987; Revised March 03, 1988; Online November 23, 2009

Abstract

In this paper a unified theory is presented for system identification in structural dynamics using recursive frequency-domain filters. Output error, equation error, and instrumental variable (I. V.) filters are developed as special cases. Parameter estimates are extracted from noisy simulated data from a multi-degree-of-freedom system. The equation error filter is strongly convergent but is prone to asymptotic bias error in the presence of measurement noise. An I. V. filter is developed in order to overcome the bias problem while maintaining the desirable convergence properties of the equation error approach.

Copyright © 1988 by ASME
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