Comprehensive compensation for the disturbance torque of electro-hydraulic load simulator

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Comprehensive compensation for the disturbance torque of electro-hydraulic load simulator

Su, Donghai / Liu, Qinghe / Wu, Shenglin

Electro-hydraulic load simulator is testing equipment used to simulate the actual torque exerted by air on the steering axle of flying object flying over through air. It belongs to the typical passive loading system, in which, in dynamic loading process, the disturbance torque generated by the rotation of steering axle will decrease loading accuracy and influence control performances of loading system. Because the highest rotation frequency of the steering axle may reach 20 Hz, the loading system can not work normally with simple compensation. According to the characteristics of electro-hydraulic simulator, this paper presents a comprehensive compensation method to eliminate the disturbance torque and improve the control performances. Based on the synchro-compensation, this comprehensive compensation feeds the velocity difference between loading motor and synchronous motor forwards to realize the second discharge of disturbance torque coupling to the loading system. After founding mathematics model, the performances of the compensated system is analyzed through computer simulation. The correctness and effectiveness of the comprehensive compensation for eliminating disturbance torque are proved by experimental results.