NUMERICAL STUDY ON IDENTIFICATION OF TIME-VARYING PARAMETERS OF VIBRATION SYSTEMS

As on-line least squares algorithm has previously been successfully ap plied to linear vibration systems in order to identify time varying pa rameters. In this article the limitations of the approach and the fact ors affecting the identification are further examined. The existence o f the nonlinear terms is determined by means of the time varying chara cteristics of the estimated linear parameters using the linear model a nd the data from a time invariant nonlinear system. The identification of the time varying linear parameters if also examined in accordance with the linear model by using the data with nonlinear elements. (C) 1 997 John Wiley & Sons, Inc.