Modeling and Characteristic Research of Pressure Servo Valve with an Asymmetric Nozzle Flapper
The mathematical model and MATLAB/Simulink simulation model were established for a pressure servo valve with an asymmetric nozzle baffle structure(asymmetric pressure valve).The static and dynamic performance of the entire valve was analyzed,and the design principles of asymmetric pressure valve were studied.The research results indicate that the valve is a one-way positive gain pressure servo valve with a dead zone,which has high output pressure,good linearity,small hysteresis,and fast dynamic response.The intersection point of nozzle cavity pressure and output pressure has a unique mapping relationship with static performance indicators,and the position of the intersection point can be used to determine whether the performance of the servo valve meets the working requirements.The asymmetry of the end face area of the valve core is the source of the asymmetry of the front stage.In order to ensure the zero position stability and performance requirements of the asymmetric pressure valve,the front stage needs to be set in an asymmetric form.The liquid resistance coefficient ratio of the fixed throttle hole is greater than that of the nozzle hole.The asymmetry of the nozzle clearance is beneficial for reducing the influence of nozzle structural parameters and facilitating the size design and debugging of the servo valve;Finally,the accuracy of the mathematical model was verified through experiments.The mathematical and simulation models can provide a basis for the structural design and optimization of pressure servo valves.
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