电动静液作动器非线性框图建模与鲁棒控制方法

Nonlinear Block Diagram Model and Robust Control of Electro-hydrostatic Actuator

阐述了机载电动静液作动器(EHA)的典型工作原理与结构特点,根据其元部件数学方程,建立非线性精确框图模型,完善了EHA补油回路和摩擦特性的描述。通过对系统阻尼、稳态误差及摩擦的仿真分析,设计了一种结合动态压力反馈与变增益控制策略的状态反馈控制器,改善了系统动、静态性能。鲁棒性测试结果反映了系统参数不确定性对性能的影响。

This article describes a typical architecture of electro-hydrostatic actuator （EHA）, and establishes its nonlinear accuracy model by block diagram, which contains the refeeding circuit and friction. Based on the simulation analysis of damping, static error and friction, this article utilizes the dynamic pressure feedback and gain variable strategy to design the controller in state space. The robust-test results indicate the influence of parametric uncertainness on system performance.