A Giant Magnetostrictive Actuator(GMA) driven mechanism for piston noncircular pin hole boring is presented. In order to attain desired radial displacement of the boring bar accurately

a compounding feedforward compensation method is proposed. The classical Preisach model for the hysteresis of GMA is introduced briefly

and a novel iterative compensation algorithm is proposed to avoid calculating Preisach converse model directly. Then the implement procedure of the iterative algorithm is discussed and the block diagram is given. A good linearization between the input current of GMA and its hysteresis output is found

the effect of the algorithm is valided by experiment. A repetitive control compensator is designed to improve the control performance of the GMA further

and then a compounding feedforward compensation method is presented based on the two compensators. Experiment results show that

at the case of open loop control

the iterative compensation algorithm can reduce the hysteresis nonlinearization of GMA from -15.7%~+11.8% to -4.6%~+5.2%

and the PID control based on compounding feedforward compensation can reduce the tracking error of GMA to 1 μm. These conclusions indicate that the iterative compensation algorithm is effective

it can avoid calculating the Preisach converse model directly and the PID control based on compounding feedforward compensation can improve the control performance of GMA further.