【作者】 王艳丽；

【导师】 张奕；

【作者基本信息】 长安大学 ， 机械电子工程， 2007， 硕士

【摘要】 本文介绍了电液比例控制系统的发展、原理及研究现状。在长安大学液压实验室现有的电液比例压力-流量控制试验台的基础上搭建了电液比例阀控马达速度控制系统试验平台,并对其电气系统和液压系统的组成部件及其工作原理进行了详细的分析介绍。在对系统进行动态分析的基础上建立了阀控马达速度控制系统的数学模型。对阀控马达速度控制系统进行辨识试验,在试验中,我们用1250频率响应分析仪给电液比例方向阀输入幅值不变,频率变化的正弦信号,对系统进行频率特性测试,并采用最小二乘曲线拟合法对系统进行辨识,估计出系统数学模型的参数,再分析系统性能指标。最后,采用基于线性二次型最优控制的PID控制器对阀控马达系统进行校正,并通过MATLAB仿真,表明基于线性二次型最优控制的PID控制器能使阀控马达系统获得良好的控制效果。更多还原

【Abstract】 This paper introduces the development and principle, and present study situation of electro-hydraulic proportional control system, puts up the experiment platform of the electro-hydraulic proportional valve-motor system base on the electro-hydraulic proportional pressure-flow controlled experiment platform that now has in the laboratory of Chang’an University. And every component and its work principle of electrical system and hydraulic pressure system are analyzed in detail, establishing the mathematics model of the valve -motor system base on making dynamic analysis to the system. The text introduces identification experiment of electro-hydraulic proportional valve-motor system , in the experiment, the author input the sine signal of invariable amplitude and variable frequency to electro-hydraulic proportional direction valve from 1250 Frequency Response Analyzer, by the means of curve approximation based on least-square, tests characteristic of frequency response and identify the system of electro-hydraulic proportional valve-motor system, then estimates the parameters of the mathematics model of the valve-motor system. Then analysis function index of the valve-motor system. At last, a PID controller that based on LQR theory is adopted to Rectify the Electro-hydraulic proportional valve- motor system, and the simulation result of MATLAB proves that the PID control has good result.更多还原