Pressure Control of a Large-scale Hydraulic Power Unit Using π Bridge Network

作     者：FENG Bin GONG Guofang YANG Huayong 

作者机构：The State Key Lab of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China 

出 版 物：《Chinese Journal of Mechanical Engineering》 (中国机械工程学报（英文版）)

年 卷 期：2011年第24卷第3期

页      面：386-391页

核心收录：

学科分类：081702[工学-化学工艺] 081401[工学-岩土工程] 08[工学] 0817[工学-化学工程与技术] 0814[工学-土木工程] 

基　　金：supported by National Natural Science Foundation of China (Grant No. 50975252) National Basic Research Program of China (973 Program,Grant No. 2007CB714004) 

主　　题：two stage pressure relief valve π bridge resistor network flow-pressure characteristics 

摘      要：The steady state and dynamic characteristics of pressure output of a hydraulic power unit are important to the hydraulic system *** of the compact structure,the B-half bridge resistance network is widely used in the pilot controlled pressure relief *** the steady-state pressure error might be unacceptably big in those pressure control systems.A constant pressure power unit is typically assumed in analysis of steady state and dynamic behavior of hydraulic *** flow-pressure relationship seems to be much complex,in particular when big flow variation takes *** this paper,the π bridge hydraulic resistance network pilot stage is designed in order to get better flow-pressure *** on the similarity of electrical circuits,the main factors influencing flow-pressure characteristics are ***,the optimum diameters of both constant hydraulic resistor and dynamic resistor are ***-pressure characteristics are compared with different constant hydraulic resistors,dynamic resistor and spring stiffness by simulations and *** of simulations and experiments show that flow-pressure characteristics depend very little on the spring stiffness in whole flow *** controlled pressure characteristics can be achieved with suitable constant *** can be reduced with the small diameter of the dynamic ***-pressure characteristics of pressure relief valve can be improved with a π bridge pilot *** proposed pressure control method will provide some positive guidelines and be helpful to design a high performance hydraulic system with large flow.