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RESEARCH PAPERS: Vibration and Sound

An Eigensystem Realization Algorithm in Frequency Domain for Modal Parameter Identification

[+] Author and Article Information
J.-N. Juang

Structural Dynamics Branch, NASA Langley Research Center, Hampton, Virginia 23665

H. Suzuki

NASA Langley Research Center, Hampton, Virginia 23665

J. Vib., Acoust., Stress, and Reliab 110(1), 24-29 (Jan 01, 1988) (6 pages) doi:10.1115/1.3269475 History: Received July 18, 1987; Online November 23, 2009

Abstract

This paper demonstrates the close conceptual relationships between time domain and frequency domain approaches to identification of modal parameters for linear systems. A frequency domain eigensystem realization algorithm, via transfer functions, is developed using a known procedure formulated for a time domain eigensystem realization algorithm, via free decay measurement data. An important feature is the capability of windowing to concentrate analysis on the frequency range of interest. The procedure of overlap averaging is used to produce smoother spectra to reduce the effect of noise on identified modal parameters. Examples from simulation and experiments are given to illustrate the validity of formulations derived in the paper.

Copyright © 1988 by ASME
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