Identification and control of periodic disturbances

A new Adaptive Feed-Forward strategy is presented, that identifies the periodic disturbances of known frequencies. These disturbance sources can be external or internal. Internal disturbance are also called self-excited vibrations that come from the load or its parameter variations. These variations depend periodically on the angle of rotation particularly in the case of rotary machines. The identified parameters of the disturbance model are used to design feed forward controller to counteract the disturbance effect on the system output, this is to be with a minimum interaction with an already existing, set point tracking feedback controller.