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《Journal of Zhejiang University(Engineering Science)》 2008-05
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Simulation and experimental investigation on pressure dynamics of pneumatic high-speed on/off valves

XIANG Zhong,TAO Guo-liang,XIE Jian-wei,LIU Hao(State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University,Hangzhou 310027,China)  
The high-speed on/off valve's dynamics according to the traditional definition is difficult to extract and to clearly trace back its physical origin. A new method,symbolized by the turning points of pressure in the control chamber,and both characterized by the delaying time of the pressure transmission and the rising time in the recharging process,was proposed to describe the traits of dynamic pneumatic valves.The mathematical models based on the valve's submodels of electromagnetic,mechanical and pneumatic transmission were obtained according to the above definitions.Some influencing factors to the valve's dynamic characteristics,such as the volume of the valve controlled chamber and the cross-section area of the valve core,were analyzed by Matlab simulation tools,and a test facility was built up to verify the simulation results.The agreement between the simulation results and the experimental data proved the effectiveness of the mathematical models and the testing system.When the ratio of length to diameter is in the range of 10 to 15,the opening and closing time delay of the valve can be easily obtained from the pressure dynamics of the valve controlled chamber.
【CateGory Index】: TH138.52
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