Journal of Sound and Vibration "0886 # 190"3# \ 316324 AN ADAPTIVE FEEDFORWARD CONTROLLER FOR REJECTION OF PERIODIC DISTURBANCES

The issue of rejecting periodic disturbances arises in various applications dealing with rotating machinery [ A novel adaptive feedforward controller "AFC # design method for rejecting periodic disturbance is proposed [ It can be added to an existing feedback control system without altering the original closed loop characteristics \ such as the stability margin and transfer functions [ An adaptive algorithm derived for the proposed controller based on the steepest gradient descent method turns out to be identical to the popular delayed!x LMS algorithm [ A number of computer simulations were carried out to demonstrate the salient features of the proposed AFC compared to the conventional one [ The proposed method can be useful for control engineers in designing an adaptive feedforward controller for the rejection of the periodic disturbances[ 7 0886 Academic Press Limited