Research On System Of The Fluid Control Valve Direct Driven With Electromagnetic Linear Actuator

Fluid control valve is the core component of fluid power transmission and control system,which determines the performance of the entire system.With the development of modern in-dustry,the high response,high precision and high reliability of fluid servo control technology has become one of the key researches.Fluid control valve direct driven with the electromag-netic linear actuator can overcome the defects of the traditional servo valve.which has the significant advantages of simple structure,fast response,strong anti-pollution ability and high reliability.The promotion of its performance will also promote the development of fluid servo system.Therefore,the research of the single stage direct drive control valve has important theoretical significance and practical application value.The research object of this paper is the system of the fluid control valve direct driven with electromagnetic linear actuator.The goal is to improve the control performance of flu-id servo system.Through the combination of system design,theory analysis,mathematical modeling,simulation and experimental verification,the control technology of the fluid control valve direct driven with electromagnetic linear actuator and the magnetic resistance displace-ment transducer are studied in depth and detailed.The main work and research results of this paper include the following aspects:(1)According to the requirement of system of the fluid control valve direct driven with electromagnetic linear actuator,which can work as on/off valve mode and servo valves mod-e according to the actual needs and achieve high response and high-precision adjustment of the fluid flow,pressure and other parameters.On the basis of detailed analysis of the system function,the scheme design of the system is finished,and the overall framework of system controller,power drive circuit,system actuator and sensors system are built,and also the hard?ware and software design of the system are carried out,the foundation for subsequent model building and simulation are established.(2)The mathematical model of system of fluid control valve direct driven with electro-magnetic linear actuator is established,and the simulation analysis which includes the analysis of multi field coupling of the electronic subsystem,the mechanical subsystem,the magnetic field subsystem and the fluid subsystem are caiTied out.A simulation model is created under Matlab/Simulink.the influence of parameters on the performance of the system is analyzed in detail,the basis for the selection of control parameters provided by simulation.Finally,double loop control structure of the current loop and position loop are built.and the groundwork for the performance research and control scheme of system of fluid control valve direct driven with electromagnetic linear actuator laid.(3)In order to meet the system requirements of low cost and high precision linear dis-placement tests.The magnetic resistance displacement sensor is researched.Based on the principle of magnetic resistance,a kind of reluctance linear displacement sensor is designed for system of fluid control valve direct driven with electromagnetic linear actuator.In light of the problems such as presence of electromagnetic disturbances caused by the large current tran-sients of electromagnetic linear actuator.A differential double reluctance displacement sensor is proposed.A three dimensional simulation model is built in Ansoft software.the reference and basis for the selection of sensor bias magnet arrangement are provided,and an experiment platform is built.the static and dynamic testing of the designed sensor are carried out,and the feasibility of the scheme and the performance of the designed sensor are test and verified,the test requirements the direct drive fluid control valve system of linear displacement is satisfied.(4)According to the requirement of fast response of system of fluid control valve direct driven with electromagnetic linear actuator,the control of direct drive valve's continuous rise process which based on inverse system+gain scheduling PI is studied.which takes advantage of fast response characteristic of inverse system and accuracy advantage of gain scheduling PI,the subsection control is adopted,and the transition process is increased.Inverse system con?trol is used when the target is far away from the target.When close to the target position,switch to PI control,the algorithm automatically switch by using switching rules and fuzzy control,the control goal of the fluid control valve at any position within the setting lift is realized,and at the same time ensures certain control accuracy are achieved.(5)The research of full format model free adaptive control is accomplished.On the basis of the nonlinear model which does not depend on the parameters of the system,and through online interaction of feature parameter identification algorithm and control algorithm,the adap-tive control of system of fluid control valve direct driven with electromagnetic linear actuator is realized.A mathematical model is established under Matlab/Simulink,the feasibility of the al-gorithm is verified by the simulation.And the system response under the disturbance and load calculated.The test and verification are finally carried out on the test platform.The results show that the algorithm could be adapted to different control valve lift with the same control parameters.The steady state error is small,and the response speed is high.