RESEARCH PAPERS: Vibrations Papers

Application of Gradient Search Procedures for the Identification of Unknown System Parameters From System Response Observations

[+] Author and Article Information
R. M. Laurenson

McDonnell Douglas Astronautics Company, St. Louis, Mo.

J. R. Baumgarten

University of Nebraska, Lincoln, Neb.

J. Eng. Ind 94(1), 109-114 (Feb 01, 1972) (6 pages) doi:10.1115/1.3428098 History: Received May 27, 1971; Online July 15, 2010


Techniques for identifying and evaluating the physical parameters of nonlinear dynamic systems have been investigated A method has been developed for converting the measured dynamic response of a system into estimates of its unknown dissipation function. A computational algorithm employing an optimization or gradient search technique was written for determining the unknown system parameters. This procedure uses a least squares criterion function to determine the measure of agreement between the mathematical representation of the system and the physical system. A rather general statement of the nonlinear equation of motion allows a better final determination of the system than that provided by some fixed-form describing function. The technique is especially adaptable to the identification problem of determining the dissipation function of a nonlinear shock absorber.

Copyright © 1972 by ASME
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