无模型控制器在气缸压力控制系统中的应用研究  

Model-free Adaptive Controller and Its application in Cylinder Pressure Control System

作　　者：刘昱 刘昌龙 吕文洋 彭锋 季忆 刘笑 LIU Yu;LIU Chang-long;LV Wen-yang;PENG Feng;JI Yi;LIU Xiao(College of Information Engineering,Beijing Institute of Petrochemical Technology,Beijing,102617;College of Information Science&Technology,Beijing University of Chemical Technology,Beijing,100029)

机构地区：[1]北京石油化工学院信息工程学院,北京102617 [2]北京化工大学信息科学与技术学院,北京100029

出　　处：《液压与气动》2018年第10期49-53,共5页Chinese Hydraulics & Pneumatics

基　　金：国家自然科学基金(51405023)

摘　　要：气动伺服系统存在纯时延、非线性、时变等特点,传统的控制策略(如PID控制)在解决非线性系统时效果不理想,因此提出一种无模型控制算法。此方法在被控对象结构复杂、参数时变时控制效果较好。首先对气动伺服系统进行建模,建模过程包括阀口流量、比例流量阀及缸内压力建立一个二阶模型;其次设计无模型自适应控制器(Model-Free Adaptive Controller,MFAC)用于气动伺服系统压力控制;最后利用LabWindows/CVI平台进行试验验证。结果表明,针对气动伺服系统设计的无模型控制器是有效的,相比于传统PID控制有更快的响应速度和更高的控制精度。A pneumatic servo system has characteristics of pure delay,nonlinearity,time-varying,etc.A model-free control algorithm is proposed,because the traditional control strategy such as PID control is not ideal for solving nonlinear systems.The control effect is better when the controlled object has a complex structure and time-varying parameters.Firstly,a pneumatic servo system is modeled.The modeling process includes valve port flow,proportional flow valve and in-cylinder pressure,and we establish a roughly accurate second-order model.Secondly,a model-free adaptive controller is designed for pressure control of a pneumatic servo system.Finally,the Labwindows/CVI platform is used for experiment verification.The results show that the model-free adaptive controller designed for pneumatic servo system is effective and has faster response speed and higher control accuracy than traditional PID control.

关 键 词：气动伺服系统 PID控制 无模型自适应控制 LABWINDOWS/CVI 

分 类 号：TH138[机械工程—机械制造及自动化] TP273[自动化与计算机技术—检测技术与自动化装置]