基于阀控缸电液系统的前馈-反馈联合控制策略研究

阀控缸电液系统应用广泛，提高其响应速度、控制精度与可靠性具有重要意义。传统闭环控制基于反馈误差调节，控制简单、稳定性好、易用于复杂系统，但存在时滞与稳定性问题；前馈控制作为一种开环控制方式，具有响应快、无时滞的优点，但控制效果依赖模型精度。针对上述问题，提出一种基于阀控缸电液系统的前馈-反馈联合控制策略，建立其数学模型，运用AMESim软件搭建仿真模型并进行可行性分析，通过实验建立伺服阀流量-压差-电压前馈参数表，最后基于Simulink建立变转速恒压油源实验平台并进行实验验证。仿真及实验结果表明：前馈-反馈联合控制可提高阀控缸电液系统的控制精度和响应性，相较于反馈控制方式跟踪精度提高45%，具有良好的综合控制效果。

Research on Feedforward-Feedback Joint Control Strategy Based on Valve-Controlled Cylinder Electro-Hydraulic System

Valve-controlled cylinder electro-hydraulic system is widely used,and it is important to improve the response,control accuracy and reliability of the system.Traditional closed-loop control is based on feedback error control,which is simple to control,has good stability,and easy to use in complex systems,but there are problems of time lag and stability.As an open-loop control method,feedforward control has the advantages of fast response and no time lag,but the control effect depends on the accuracy of the model.In order to solve the above problems,a feedforward-feedback joint control strategy based on the electro-hydraulic system of valve-controlled cylinder was proposed,and mathematical model of the system was established,the simulation model of the system was built by using AMESim software and the feasibility analysis was carried out;a parameter table of servo valve flow-differential pressure-voltage feedforward was established by experiments.Finally the experimental platform of variable-speed and constant-pressure oil source was established based on Simulink and verified by experiments. The simulation and experimental results show that the combined feedforward-feedback control can improve the control accuracy and responsiveness of the valve-controlled cylinder electro-hydraulic system,and the tracking accuracy is increased by 45% compared with the feedback control method,which has a good comprehensive control effect.