Simulation And Experimental Study On Virtual Prototype Of Servo Proportioanal Valve

The servo-proportional valve is a product that has been gradually developed on the basis of servo valves and proportional valves.It has the characteristics of high control accuracy and high frequency response of servo valves,but also the advantages of proportional valves in terms of low oil cleanliness requirements and high reliability.Therefore,servo-proportional valves are widely used in areas with high control requirements,such as aviation,aerospace and chemical industry,and have a broad development and application prospect.In this paper,a virtual prototype of a servo-proportional valve is investigated,and a virtual prototype of a servo-proportional valve involving the coupling of multiple physical fields such as electromagnetic,electric,flow and mechanical fields is established and verified through tests.The main research elements of this paper are as follows:(1)The current status and development trends of servo-proportional valves and their modelling methods at home and abroad are reviewed.On this basis,the components and operating principles of the servo-proportional valve are analyzed,and a virtual prototype of the servo-proportional valve with multiple physical fields coupled to each other is proposed.(2)The circuit modules such as PID circuits and power drivers are built in the Ansys Twin Builder software and eventually form a closed-loop control circuit model.The spool dynamics equations were also established and the corresponding dynamics model was built on the Twin Builder platform.On the Ansys Maxwell software platform,a simulation model of a servo-proportional solenoid was completed using the finite element analysis method.(3)The internal basin of the servo-proportional valve is modelled in three dimensions,and steady-state and transient simulations are carried out using Ansys Fluent to obtain the forces applied to the spool movement.On this basis,a hydrodynamic step-down model of the spool was developed in Matlab Simulink for different valve opening and movement speeds.(4)Based on the coupling interface between Ansys Twin Builder,Maxwell and Matlab Simulink,the joint simulation of the closed-loop control circuit model,mechanical dynamics model,servo-proportional solenoid model and hydrodynamic step-down model is carried out to realise the information interaction of multiple physical fields and complete the construction of the servo-proportional valve virtual prototype.(5)Based on the servo-proportional valve virtual prototype platform,the spool displacement step response and frequency characteristics were simulated,and the dynamic response of the servo-proportional valve was tested on the test bench.The maximum error between the simulation results and the test results did not exceed 16%,which verified the accuracy of the virtual prototype and provided an effective platform for the subsequent development and optimisation of the servo-proportional valve.