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Research on dynamic torque performance of load simulator based on rotary electro-hydrostatic actuator

Load simulator (LS) is a key equipment for the hardware-in-the-loop (HIL) experiments in the aerospace field. In order to output greater torque and receive higher torque loading accuracy, the electro-hydraulic load simulator with the form of valve-controlled hydraulic swing motor (VCMLS) is widely applied in the engineering. But VCMLS has to face the harsh fact of excessive energy consumption despite obtaining a satisfactory torque loading effect. To solve this problem, in this paper, the rotary electro-hydrostatic actuator (REHA) was employed as a load simulator (REHALS) to carry out torque loading task on the actuator. As a pump-controlled system, owing to no throttling loss, REHALS has extremely high energy efficiency. Through establishing the mathematical model and making a simulation validation, it was found that torque loading performance of REHALS can meet the requirements of loading accuracy of the actuator, which means that REHA can be used as a loading device instead of VCMLS when considering energy consumption.