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RESEARCH PAPERS

Methods of Preserving Symmetry in Model Updating

[+] Author and Article Information
M. J. Lam, D. J. Inman

Department of Engineering Science and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0219

J. Vib. Acoust 117(3A), 349-354 (Jul 01, 1995) (6 pages) doi:10.1115/1.2874458 History: Received July 01, 1993; Online February 26, 2008

Abstract

This work examines the model updating technique for both conservative and nonproportionally damped systems. In model updating, also referred to as model correction, the analytical model is updated until it agrees with the experimental data available. In this paper it is assumed that the measured modal data, i.e., natural frequencies and in some instances mode shapes, disagrees in part with the modal parameter predicted by the analytical model. Many model updating schemes tend to produce nonsymmetric updated stiffness (and damping) matrices. The methods presented here focus on retaining the desired symmetry in the updated model

Copyright © 1995 by The American Society of Mechanical Engineers
Topics: Damping , Shapes , Stiffness
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