模糊及PID控制在变转速液压动力源流量控制中的应用研究  

Research on Application of Fuzzy and PID Control in Flow Control of Variable Speed Hydraulic Power Source

作　　者：谷立臣[1] 祁泽林 李贾宝 GU Li-chen;QI Ze-lin;LI Jia-bao(School of Mechanical and Electronic Engineering,Xi’an University of Architecture and Technology,Shanxi Xi’an710055,China)

机构地区：[1]西安建筑科技大学机械电子技术研究所,陕西西安710055

出　　处：《机械设计与制造》2021年第4期29-33,共5页Machinery Design & Manufacture

基　　金：国家自然科学基金项目(51675399、51275375)。

摘　　要：针对变转速液压系统存在动态响应慢、非线性、控制精度低等问题,特别是负载快速多变时,流量和压力之间产生强耦合,流量控制会出现时变性和不稳定性,采用常规PID控制无法取得理想控制效果。因此结合模糊控制原理,基于LabVIEW测控平台,提出以液压动力源输出流量为控制量的模糊控制策略,对不同典型工况下流量的精确控制进行实验研究,并将液压动力系统在两种控制方法下的动态响应特性、控制精度和稳定性等进行了对比分析评价。结果表明:所提模糊控制策略实际控制效果较好,两种控制方式下的动态响应特性相近,但模糊控制具有更好的鲁棒性。Aiming at the problems of slow dynamic response,nonlinearity and low control precision of variable speed hydraulic system,etc,especially when the load is fast and changeable,strong coupling between flow and pressure produces,time-varying and unstable will occur in flow control,using conventional PID control can not achieve ideal control effect.Therefore,combining fuzzy control theory,based on the LabVIEW measurement and control platform,a fuzzy control strategy based on the output flow of hydraulic power source is proposed,we conduct experimental research on precise control of flow in different typical conditions,compare and evaluate the dynamic response characteristics,control accuracy and stability of the hydraulic power system under two control methods.The results show that the proposed fuzzy control strategy has better actual control effect,the dynamic response characteristics of the two kinds of control methods are similar,but the fuzzy control has better robustness.

关 键 词：变转速 强耦合 流量控制 模糊控制 鲁棒性 

分 类 号：TH16[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]