Frequency selective dual control for periodic disturbance cancellation

This work combines two well-known approaches to control: dual control and h armonic control. The combination results in high speed of adaptation and th e possibility of using feedback controllers in practical situations where t raditionally feedforward controllers were preferred. The use of frequency-s elective filters results in fast adaptation without substantial increase in on-line computing effort. The approach proposed is more suitable for adapt ive cancellation of periodic output disturbances. Dual controllers are comp uted around each relevant frequency of the disturbance and the control inpu t to the plant is synthesized from them. Simulations illustrate how the con trol scheme works. Copyright (C) 2000 John Wiley & Sons, Ltd.