Improved Inverse Eigensensitivity Method for Structural Analytical Model Updating

[+] Author and Article Information
R. M. Lin, M. K. Lim, H. Du

School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 2263, Republic of Singapore

J. Vib. Acoust 117(2), 192-198 (Apr 01, 1995) (7 pages) doi:10.1115/1.2873889 History: Received October 01, 1993; Online February 26, 2008


In order to update analytical models of practical engineering structures, inverse eigensensitivity method (IEM) has been developed. Though it has nowadays been widely accepted, the classical inverse eigensensitivity method does have some drawbacks such as the assumption of small error magnitudes and slow speed of convergence due to the fact that the sensitivity coefficients are calculated purely based on modal data of analytical model. In the present paper, an improved inverse eigensensitivity method, which avoids the existing problems of classical inverse eigensensitivity method, has been developed. The improved method employs both analytical and experimental modal data to calculate the required eigensensitivity coefficients which are very close to their true values. The method has been further extended to the case where measured coordinates are incomplete. Practical applicability of the method has been assessed by its application to the updating of the finite element model of a plane truss structure.

Copyright © 1995 by The American Society of Mechanical Engineers
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