Simulation And Experimental Study On Virtual Prototype Of Direct Acting High Performance Proportional Directional Valve

As a bridge between modern microelectronic technology,computer control technology and high power engineering control equipment,electro-hydraulic proportional control technology has been widely used in industrial field.Electro-hydraulic proportional valve as an important part of electro-hydraulic proportional control system to achieve the output of the hydraulic pressure and input signal in accordance with the proportion of control,with a broad space for development.At present,the electro-hydraulic proportional valve and servo valve,the performance gap is shrinking.Improve the performance of electro-hydraulic proportional valve,help to improve the overall characteristics of electro-hydraulic proportional control system,in the future has a vast market prospects.In this paper,the direct-acting proportional directional valve was researched,with its main components proportional solenoid and spool as the research object.The proportional solenoid and internal flow field virtual prototyping were built respectively.The main contents and results are as follows:(1)Taking GP45 proportional solenoid as research object,static and dynamic simulation of magnetic field and temperature field simulation were carried out respectively.Through the static simulation of the electromagnetic field,the distribution of the magnetic circuit in the electromagnet was obtained.The parameters such as the width of the sleeve,the armature diameter,the length of the armature and the rake angle of the anti-magnetic ring were numerically analyzed by using the parameter sensitivity analysis method.Static static analysis was also carried out.(2)Through the dynamic simulation of magnetic field,the structural parameters that affect the dynamic performance of the electromagnet were simulated and analyzed,and the motion law of the armature pull-in motion was obtained,and the dynamic characteristic of the electromagnet was improved by changing the coil turns.Through the simulation of temperature field,the coil heating under different turns was obtained.Finally,a set of structural parameters was determined by the simulation results of the electromagnet.(3)According to the 6 mm and 10 mm spool valve structure,the flow channel model and the gap model were established by using the virtual prototype technology.Through the simulation of the flow channel model,the steady-state fluid dynamics and the transient fluid dynamics of the spool under different openings and the flow field inside the flow channel were obtained,and the influence of the total hydrodynamic force on the spool was determined.(4)Through the simulation of the gap model,the effects of radial unbalance force and radial pressure on the radial unbalance force are obtained.Finally,according to the simulation results,the pressure groove structure on the 6 mm and 10 mm valve spool steps was improved.(5)The validity of the simulation is verified by testing the virtual prototypes of the electromagnets and the virtual prototype of the flow field inside the valve.Through the comparison of electromagnets and spool structure improvements,can effectively improve the overall performance of the proportional directional valve.The virtual prototype of the proportional solenoid and the valve flow field were verified by experiments.Through the structure improvement of the proportional solenoid and the spool,the overall performance of proportional directional valve can be effectively improved.