关键词: 机电作动器, 多物理域耦合, 增量式非线性建模, 基于模型的系统工程, 推力矢量控制

Abstract: 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 requirement 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 incremental 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.

Key words: electro-mechanical actuator, multi-physical domain coupling, incremental non-linear modeling, model-based system engineering, thrust vector control