RESEARCH PAPERS: Vibration and Sound

A Linear, Frequency Domain Filter for Parameter Identification of Vibrating Structures

[+] Author and Article Information
John E. Mottershead, Roger Stanway

Department of Mechanical Engineering, University of Liverpool, U.K.

Arthur W. Lees

Scientific Services Department, Central Electricity Generating Board, Bedminster Down, Bristol, U.K.

J. Vib., Acoust., Stress, and Reliab 109(3), 262-269 (Jul 01, 1987) (8 pages) doi:10.1115/1.3269430 History: Received March 04, 1987; Online November 23, 2009


In this paper the authors present a linear, least-squares, frequency domain filter for the identification of structural vibration parameters, such as mass, stiffness, and damping, from observed forces and responses. The method is based on an equation error formulation which produces a measurement equation which is linear in the unknown parameters. Convergence of the parameter estimates is achieved rapidly and the period required to obtain convergence is indicated by the CPU time measured on an IBM 3083 computer. Results obtained using simulated data are used to compare the linear filter with alternative filter formulations. Experimental results from a portal frame rig are given to demonstrate the application of the method to physical measurements.

Copyright © 1987 by ASME
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