空间直线驱动机构伺服系统建模与仿真

Modeling and Simulation of Servo System for Aerospace Linear Electro-Mechanical Actuator

针对高精度、宽频响、大负载空间直线驱动机构的伺服系统建模研究,分析了伺服系统的组成,设计了电流调节器,速度调节器和位置调节器的结构和参数。为提高空间直线驱动机构伺服系统建模的准确性,联合Simulink建立的控制系统数学模型与Simscape建立的空间直线驱动机构的物理模型,对伺服系统的动态响应能力进行仿真和分析。仿真结果表明,基于Simscape的物理模型更加接近实际系统,空间直线驱动机构的随动能力良好,验证了控制方案的正确性和可行性,满足了设计输入要求。

In this paper, the modeling function of servo control system for aerospace linear electro-mechanical actuator （ linear EMA） with high accuracy, broad band and heavy load is analyzed. Structure and parameters of current loop, velocity loop and position loop are designed and components of servo system are analyzed. In order to improve the accuracy of linear EMA servo system model, combined with the control mathematic model established using Simulink and linear EMA physical model built though Simscape, dynamic response of the servo system is simulated and analyzed. According to the simulation, the physical modelling in use of Simscape is closer to real system and linear EMA has a good displacement tracking ability. Correctness and feasibility of the controlling project are proved and the project satisfies the designed inputting requirement.