The accuracy of high performance electromechanical actuator(EMA)system model has important influ-ence on the simulation accuracy of aircraft guidance and control loop. Aiming at solving the deficiency in the reflec-tion 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 con-ducted 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 fi-delity 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.%针对传统二阶环节模型对舵系统实际特性反映不足的缺陷提出一种全局耦合结构模块化的高保真建模方法.在对建模流程进行阐述的基础上,以"无刷直流电机/滚珠丝杠副/拨叉"类型电动舵机为对象进行高保真建模研究.分析了系统高保真模型组成结构,并对其中伺服电机、传动比、机械惯量和传动柔度等非线性因素的建模方法进行详细阐述.利用simulink进行仿真结果表明,建立的高保真模型对舵机输入输出特性和内部状态特性的表现能力与实际系统高度一致,有效保证了系统模型的真实度,对提高飞行器制导控制回路的仿真精度有重要作用.
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