Design and performance analysis of a dual-variable electrohydrostatic actuator for aerospace application

In the field of more electric aircraft, electrohydrostatic actuator (EHA) is becoming more and more attractive because of its specific benefits for saving maintenance costs and improving system flexibility. This communication presents a dual-variable prototype of EHA, which can be driven by variable pump/variable motor (VPVM). Firstly, the schematic diagram of VSVP-EHA is presented, and then the physical effects are considered in the mathematic model by using model-based systems engineering approach. Then the control strategy consisting of PID and amended constant-frequency switch in hysteresis current control is proposed. System-level simulation model is built and implemented by co-simulation process in Matlab/Simulik and LMS-AMESim environment. Finally, a particular focus is put on position control performance, a series of simulation and experimental results show the expected working principle and desired performance.