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

MI Friswell & JET Penny (Aston University)

Journal of Vibration and Acoustics, Vol. 114, No. 4, October 1992, pp. 514-520

Abstract

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.

Paper Availability

This material has been published in the Journal of Vibration and Acoustics, Vol. 114, No. 4, October 1992, pp. 514-520, the only definitive repository of the content that has been certified and accepted after peer review. The copyright has been assigned to the American Society of Mechanical Engineers.


Link to paper using doi: 10.1115/1.2930293

Journal of Vibration and Acoustics