ADAPTIVE SLIDING MODE BASED SERVO TRACKING CONTROL OF AIRCRAFTS' ACTIVE INCEPTOR CONTROL SYSTEMS

摘要

For the problem of the stick-displacement command tracking control of the large aircraft active inceptor control systems (AICS), an adaptive sliding mode control approach is proposed and verified in the servo system of AICS. First, the servo system model is established including models of a three-phase permanent magnet synchronous machine (PMSM), a gear box, a control unit and dynamics of the side stick. Secondly, in order to guarantee the tracking accuracy of torque of the PMSM and displacement of the side stick even in the presence of disturbance, a sliding mode control (SMC) based direct torque control (DTC) of the PMSM and a SMC based position control strategy are proposed. Meanwhile, to cope with variable stiffness problem of the spring in the AICS, an adaptive sliding mode controller is proposed. And the stability of the closed-loop adaptive SMC servo system is proven by Lyapunov stability theory. Finally, simulation results of the servo system of aircraft's AICS show that the torque of the PMSM and displacement of the AICS are well tracked by the proposed controller and the sliding mode controller with adaptive algorithm has better tracking performances than those of non-adaptive control one.