Sensitivity Analysis of Influencing Factors on Pressure Gain of Electro-hydraulic Servo Valve
Pressure gain is one of the core performance indexes of electro-hydraulic servo valve.However,electro-hydraulic servo valve has electromechanical coupling,sealing property and complexity of structural parameters,which limits the improvement of pressure gain of electro-hydraulic servo valve.It is urgent to clarify the influencing factors and weight of pressure gain.Therefore,taking deflector jet servo valve as the research object,a multi-link mathematical model of the servo valve machine,electricity and hydraulic was established,and the whole valve state space model was obtained.Then,the correlation and weight of the influence of the structural parameters of the servo valve on the pressure gain of the servo valve were analyzed by using the first-order sensitivity analysis method combined with the pressure gain formula.Finally,based on the electro-hydraulic servo valve performance test experimental platform.The influence of two typical structural parameters,the size of the pre-stage nozzle and the cover amount of the spool stage,on the pressure gain is verified.The research results provide some theoretical guidance for the improvement of static performance of electro-hydraulic servo valve.
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