Research On Characteristics Of Electro-hydraulic(Proportional) Directional Valve Based On Magnetorheological Fluid

The hydraulic valve is the core control element in the hydraulic system.It is used to control and adjust the fluid direction,pressure and flow in the hydraulic system,thus changing the movement direction,thrust and speed of the actuator.The performance and reliability of the hydraulic valve directly affect the working quality of the entire hydraulic system.The directional valve is a type of hydraulic valve.There are many types of existing directional valves.Among them,the electromagnetic directional valve and the electro-hydraulic proportional directional valve are widely used due to their high degree of automation,good reliability and high cost performance,but electromagnetic The response speed of the directional valve is low.In modern times,with the maturity of magnetic materials,electromagnetics and computer technology,magnetorheological technology is gradually used in the field of hydraulic transmission and control.The electro-hydraulic(proportional)directional valve based on magnetorheological technology has relatively few moving parts,Compact structure,fast response of spool.This article introduces the classification of directional control valves and the current research status of magnetorheological valves and magnetorheological directional control valves.It also introduces the application status and future development prospects of magnetorheological technology.A magnetorheological directional control valve is proposed.The research content of this paper is divided into two parts:(1)the finite element software Maxwell is used to simulate the magnetic field line distribution of the magnetically permeable radial flow magnetorheological valve,and the Matlab software is used to optimize the internal structure size of the valve body using a penalty function method.Increase the effective magnetic field inside the valve body.(2)Using Fluent software to influence the spool displacement distance of hydraulic directional valve to the output pressure loss,the simulation experiment results show that increasing the spool movement distance can reduce the output pressure loss and reduce the loss of fluid transmission at the spool.In this paper,the pressure drop performance of the magnetically permeable radial flow magnetorheological valve is tested through pressure drop experiments,and the current-pressure drop curve is obtained.The experimental results show that after the structure is optimized,the pressure drop performance of the magnetically permeable radial flow magneto-rheological valve is increased to 1.8Mpa,and the power consumption of the conventional radial magneto-rheological valve is reduced by 33.3%.In addition,according to the industry standard JB / T10373-2014 hydraulic directional valve test file,test the static characteristics(flow-pressure loss curve)of the magnetorheological directional control valve and use Matlab software to simulate the dynamic characteristics of the valve.The experimental results show that the structure design of the magnetorheological directional control valve improves the dynamic response speed of the hydraulic directional valve to the range of 10 ～ 15 ms,while reducing the pressure loss.