Direct drive servo valve based on magnetostrictive actuator: Multi-coupled modeling and its compound control strategy

• A novel DDV structure is developed based on GMA and novel hydraulic amplifier.
• A multi-coupled model of DDV is proposed with the constitute hysteresis described by J–A model.
• A compensator based on proposed model of DDV reduces its hysteresis from 11.4% to 2.1%.
• Tracking error of DDV reduces from 21.28% to 0.94% under the proposed compound controller.

In this paper, a multi-coupled model of a direct drive servo valve driven by giant magnetostrictive actuator (GMM-DDV) is established with its constitute hysteresis studied based on Jiles–Atherton model. In order to enhance its tracking performance, a compound control strategy is proposed: a feedforward controller based on the inverse of the hysteresis is employed, a semi-adaptive PID controller optimized by PSO is accompanied with the feedforward controller to deal with the disturbance of the system. The numerical simulation is realized by a joint environment of AMESim and Simulink; the special experimentation system is setup combined a master computer and a control processer based on DSP, the effectiveness of the proposed model and control strategy is valid.