电液伺服系统的非线性控制

Study of Nonlinear Control of Electro-hydraulic Servo System

针对电液伺服系统非线性、参数时变的特点,为提高系统的性能,首先讨论了系统的非线性数学模型,利用逆系统解耦控制方法,将非线性系统转化成伪线性系统,进行线性控制;在此基础上,提出了一种模糊PID自适应非线性控制设计方案,与逆系统控制方法进行了仿真比较;结果表明,采用模糊PID控制,在系统参数变化、外界扰动的影响下,具有较好的自适应性和动态鲁棒性能。

Because an electro-hydraulic servo system is nonlinear and its parameters vary with time, we establish its nonlinear mathematical model, use the inverse system decoupling control scheme and transform the nonlinear servo system into a pseudo-linear system to obtain linear control of the system. Furthermore, we propose the fuzzy PID adaptive nonlinear control scheme and compare it with the inverse system control scheme through simulation. The simulation results show that the fuzzy PID adaptive nonlinear control scheme has better adaptivity and dynamic robustness even under the influence of parameter variation and external perturbation.