开式泵控非对称缸负载容腔独立控制耦合特性

摘要

In order to address the flow asymmetry problems of closed circuit pump-controlled asymmetric cylinder systems caused by two-chamber area differences,this paper proposed an inde-pendent control of open circuit pump-controlled asymmetric cylinder systems.While two chambers of asymmetric cylinder used two different control methods,the coupling among parameters was investi-gated.Taking position and pressure combined control method as example,mathematic models and coupling problems of the systems were established and analysed respectively.Thus,the control meth-od of position feed-forward compensation decoupling were used to decouple.Based on 600 kN pump-controlled hydraulic forging press test bench,the coupling and decoupling characteristics were veri-fied.Experimental results indicate that position feed-forward compensation method may inhibit the hydraulic system couplings under sinusoidal disturbances.Specifically,when the frequencies are as 1 Hz and 1.25 Hz,the inhibition ratios are as 16.4% and 14.8% respectively.%为解决闭式泵控非对称缸系统的流量不对称的问题,设计了开式泵控非对称缸负载容腔独立控制系统,并针对其非对称缸两腔采用不同控制算法时的参数耦合问题进行研究.以位置压力组合控制为例,建立该系统数学模型并分析其耦合特性,进而提出位置前馈补偿解耦方法.基于600 kN开式泵控油压机实验平台,验证其耦合及解耦特性.结果表明:在位置正弦扰动下,当频率分别为1 Hz、1.25 Hz时,位置前馈补偿算法对其耦合作用的抑制率分别为16.4%和14.8%.