New simple adaptive control subject to disturbances and application to torsional vibration suppression

The present paper proposes a new simple adaptive control scheme taking into account of disturbances for a non-ASPR system, and investigates the global stability of the obtained adaptive algorithm. Two schemes for rejecting disturbance effects are discussed from feedback and adaptive feedforward points of view. The validity of the proposed algorithm is examined in numerical simulation and experimental study in which the adaptive torsional vibration control of an induction motor connected with a load by a flexible shaft can be achieved in the presence of torque disturbance without using any sensor for the load.