π桥电液比例溢流阀动态特性  

Dynamic characteristic of π bridge electro-hydraulic proportional relief valve

作　　者：胡燕平[1] 谌铎文[1] 毛征宇[1] 

机构地区：[1]湖南科技大学机电工程学院,湖南湘潭411201

出　　处：《煤炭学报》2007年第11期1228-1232,共5页Journal of China Coal Society

基　　金：湖南省教育厅重点资助项目(06A019)

摘　　要：开发了一种基于π桥液阻网络的新型电液比例溢流阀,建立了该阀的动态数学模型,应用Simulink软件对该阀的动态特性进行了仿真分析,对样机的动态特性和负载特性进行了试验.通过先导控制部分的参数设计可以得到具有负载特性不同的π桥电液比例溢流阀.当π桥电液比例溢流阀调压偏差大于0.5 MPa时,其动态特性良好;当调压偏差小于0.5 MPa时,其动态特性仍然是稳定的,但稳定时间延长;当调压偏差小于0.3 MPa时,π桥电液比例溢流阀有时出现不稳定现象.研究表明,当π桥电液比例溢流阀调压偏差设计为0.5 MPa左右时,其动态特性和负载特性良好.The new electro-hydraulic proportional relief valve with pilot π bridge hydraulic resistance network was developed. The mathematic model and simulation block of the valve were built and the simulation analysis was finished by Simulink software. The steady state pressure-flow performance and dynamic characteristic of the valve was investigated by experiments. The π bridge electro-hydraulic proportional relief valve with different load performances can be designed by changing the parameters of the pilot control valve. When the steady state override of the valve is larger than 0. 5 MPa, the dynamic characteristic of the valve is good. if the steady state override is less than 0. 5 MPa, the dynamic characteristic is still stability, but the value of the steady state time becomes larger. Furthermore, If the steady state override of the valve is less than 0. 3 MPa, the valve may be not stability. The research shows that when the steady state override of the π bridge electro-hydraulic proportional relief valve is designed as 0.5 MPa. Both the load performance and dynamic characteristic of the valve are good.

关 键 词：π桥液阻网络 电液比例溢流阀 动态特性 

分 类 号：TH137.52[机械工程—机械制造及自动化]