High Fidelity Modeling Method of High Performance Electromechanical Actuator

The accuracy of high performance electromechanical actuator(EMA) system model has important influence on the simulation accuracy of aircraft guidance and control loop. Aiming at solving the deficiency in the reflection of EMA characteristics using traditional second-order model, a high-fidelity global coupling modular structure modeling method is proposed. Based on the analysis of the modeling process, high-fidelity modeling research is conducted on “BLDCM/ball screw/fork” type EMA systems. The structure of high fidelity model is investigated, and modeling methods of nonlinear factors such as servo motor, transmission ratio, mechanical inertia and transmission flexibility in the system are examined in detail. Simulation results based on simulink platform show that the high fidelity model established by this method is highly consistent with the actual system performance of the input-output characteristics and the internal state characteristics, ensuring the authenticity of the system model, which plays an important effect on improving the simulation accuracy of the aircraft guidance and control loop.