The Effect of Close or Repeated Eigenvalues on the Updating of Model Parameters from FRF Data

[+] Author and Article Information
M. I. Friswell, J. E. T. Penny

Dynamics, Control and Vibration Research Group, Department of Mechanical and Electrical Engineering, Aston University, Birmingham B4 7ET, U.K.

J. Vib. Acoust 114(4), 514-520 (Oct 01, 1992) (7 pages) doi:10.1115/1.2930293 History: Received June 01, 1991; Revised January 01, 1992; Online June 17, 2008


Methods to update the parameters of finite element models using measured vibration data usually use the experimentally derived modal model, that is, the system natural frequencies, damping coefficients, and mode shapes. Alternatively the frequency response functions have been used directly to update condensed analytical models and so avoid the sometimes difficult step of deriving the modal model. Previously the authors suggested an algorithm using FRF data that is basically a weighted equation error method based on a reduced order model. This paper investigates the performance of the algorithm for systems with closely coupled or repeated natural frequencies or eigenvalues.

Copyright © 1992 by The American Society of Mechanical Engineers
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