航 天 机 电 伺 服 系 统 非 线 性 表 征 建 模 与 动 态 特 性精 细 化 预 示

Aiming at the difficulties in predicting the dynamic performance of aerospace Electro-Mechanical Actuator （EMA）due to the multiple nonlinear coupling of mechanics，electricity，magnetism and controlling，a V-shape require⁃ ment model，a multi-level architecture model and an accurate prediction model for EMA in Thrust Vector Control （TVC）are built based on Model-Based System Engineering（MBSE），Analytic Hierarchy Process（AHP）and incre⁃ mental modeling respectively. The first-level model enables the position enveloping prediction by adjusting motor power and reduction ratio. The second-level model realizes position response prediction and dimension estimation with incremental RL electromagnetic framework and trigonometric kinematic functions. The third-level model constructs the coupling relations of multi-physical domain，and the fourth-level model refines the non-linearity of key parameters which enables accurate prediction of rotating speed and current dynamic response. The prediction accuracy of the multi-level model is verified by three sets of time domain tests. The design instance indicates that the multi-level models under multiple constraints obtain 3. 6 times more than the individual fourth-level model with a 50. 6% reduction in calculating time. The optimal power-weight ratio reaches 488. 95 W/kg，and the phase frequency bandwidth reaches 9. 87 Hz，which strongly supports the rapid and accurate iteration of EMA design，and provides a feasible digital transformation practice of rocket system.