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RESEARCH PAPERS: Vibration and Sound

A Linear Time-Domain Method for Structural Dynamics Identification

[+] Author and Article Information
S. D. Fassois, S. M. Wu

Dept. of Mech. Engr. and Appl. Mechanics, The University of Michigan, Ann Arbor, MI 48109-2125

K. F. Eman

Mechanical and Nuclear Engr. Dept., Technological Institute, Northwestern University, Evanston, IL 60201

J. Vib. Acoust 112(1), 98-106 (Jan 01, 1990) (9 pages) doi:10.1115/1.2930106 History: Received February 01, 1988; Revised October 01, 1988; Online June 17, 2008

Abstract

A two-stage, time-domain structural dynamics identification method, that circumvents some of the main drawbacks of current techniques, and combines good noise rejection properties with a low computational load and accurate modal parameter extraction, is proposed. In the first stage of the method a discrete model is obtained through a linear estimation scheme and a systematic and effective modeling strategy. In the second stage the modal parameters are evaluated according to a new procedure that is capable of detecting and correcting large errors that may be introduced into the modal parameter estimates through the discrete-to-continuous transformation. The proposed method yields consistent modal parameter estimates at a low computational load, and is well-suited for microcomputer implementation. Its effectiveness is finally demonstrated with both simulated and actual experimental data.

Copyright © 1990 by The American Society of Mechanical Engineers
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