Dynamic Simulation And Optimal Design And Control Method Of Jet Pipe Servo Valve

Electro-hydraulic servo valve(EHSV)which is consist of flapper type valve and jet type valve,is the most important element in the electro-hydraulic systems.Amongst kinds of EHSVs,the jet pipe servo valve(JPSV)is extensivly applied in the hydraulic systems of aircrafts and watercrafts owing to its excellent anti-pollution performance.The JPSV which connects electrical system and hydraulic system directly determine the performance of hydraulic system.Therefor,it is essential to design the better performance of jet pipe servo vlave with high frequence band,faster response and better stability.With the development of the intelligent optimization algorithm(IOA),it has been applied in optimizating some hydraulic components,but not applied in optimizating JPSV.Further more,these applications merely combine finite elemets analysis and intelligent optimization algorithm(FEIO)or combine physis model and intelligent optimization algorithm(PMIO).Meanwhile,the FEIO needs amounts of compute resources and time,and the PMIO cannot plenarily describe the physis characteristics of hydraulic component.So,it is spontaneous to combine the advantage of two methods.The noval method which uses the finite element analysis to modify the physis model is proposed.Then the modified physis model can be used to optimizate the structural parameters based on the IOA.This method which is called FEPM,not only saves computer resource,but also improvement the accuracy of physis model.After that,the FEPM is utilized to optimizate the parts of and integral JPSV.Simultanously,a novel hybrization of hierarchical encourage genetic-particle swarm algorithm is proposed to optimizate the JPSV considering the volume parameter.The simulation results show thatThe main contributions are as follows:(1)The JPSV is consist of torque motor,prestage,and slide valve.Based on the structural principle,the physis model of JPSV(PMJV)is established.The PMJV contains hysteresis and fricaion,which is used to analysis the static and dynamic characteristics.Meanwhile,two degrees of freedom on the armature-flapper assembly is considered.(2)The numerical reults are utilized to modify the physis model of torque motor based on 3D numerical model of torque motor and electromagnetic field theory adopting the FEM.According to the modified model,the structural parameters of torque motor are optimizated by multi-objective genetic algorithm to achive three optimizatical goals including overshot,setting time and output torque.(3)The prestage of jet pipe servo vlave undertake the torque motor and slide vlave,which is used to transfer the magnetic energy of torque to mechanical energy of spool.In the dynamic state,the inner flow field of prestage is very complicated,where exists fluid solid coupling and submerged jet.The transient flow field in the prestage is analysed using software FLUENT.Then the simulation is verified by experiment.The data of simulation and experiment show that spool moves reciprocatingly from zero lap to equiliburim position for the reason of vortex in the receivers.To optimize the structure parameters of prestage,the influence of parameters such as intersection angle of receivers,distance between jet nozzle and radius of receiver.Then the mathematical model of jet hydraulic amplifier is modified by the numerical data.Meanwhile,the model is applied to optimize the structure parameters of jet hydraulic amplifier using adaptive particle swarm algorithm.(4)According to analysis of “hydraulic lock” phenomenon,the dimensionless mathematical model of lateral force distribution with traditional groove in the spool is established based on the Navier-Stroke equations of cylindrical coordinates,which by numerical analysis.Meanwhile,the influence of groove parameters on the lateral force is analysed based on the modified mathematical model,which is used to optimize the mathematical model.Finally,the mathematical model of lateral force changed with displacement of spool is derivated and verified by experiment.(5)The static characteristic and dynamic characteristic of JPSV are analyzed accoding to the optimizatical models of torque motor,prestage and slide valve.The simulation results show that the hysteresis error decreases 50%,the average overshot of different input current decreaes 56% and the average setting time improves 30%.But the volume of JPSV increases 10% over the original model.Therefor,a novel hybrization of hierarchical encourage genetic-particle swarm algorithm is proposed for optimizating the structural parameters of JPSV considering the dynamic parameters and volume.The optimal results illustrate that the proposed algorithm not only improves the static characteristic and dynamic characteristic of JPSV,but also controls the increase of volume in the range of 5% over the original model.