Study Of Dynamic Characteristics Of Cartridge Type Solenoid Switching Valve Under Wide Temperature Domain And Foundation Vibration

Cartridge type solenoid switch valve has a wide range of applications in the hydraulic system of aerospace,construction machinery and special vehicles.The use of special vehicle hydraulic system process often needs to withstand extreme temperature and strong vibration shock environment assessment,temperature changes will cause material deformation and fluid viscosity changes,the base vibration will cause changes in the valve opening,and then change the dynamic characteristics of the solenoid switch valve,affecting the stability of the hydraulic system and even the entire equipment.This paper takes a cartridge type solenoid switch valve for a special vehicle as the research object.Through simulation calculation and experimental research,the dynamic characteristics of the solenoid switch valve under wide temperature domain foundation vibration are clarified,and its structural parameters are optimized to enhance its vibration resistance,which is a guide to the design and manufacture of solenoid switch valve in foundation vibration environment.The specific works are as follows:(1)Based on the forced vibration theory,the force characteristics of the solenoid valve under foundation vibration are analyzed,and the AMESim simulation model of the foundation vibration of the solenoid valve is established to obtain the influence of the foundation vibration parameters on the dynamic characteristics of the solenoid valve in the open and closed states,and the validity of the simulation results is verified by the foundation vibration test.The results show that: when the maximum acceleration of foundation vibration is 4.2g,the low-frequency and high-amplitude foundation vibration will cause the orifice opening and flow rate of the solenoid valve in the open state to change significantly,and the orifice will not open in the closed state;the vibration amplitude in the open state is less than 4mm,the vibration frequency is less than 26 Hz,and the flow pulsation rate is less than 20%.When the vibration amplitude is less than 2.2mm and the vibration frequency is less than 90 Hz in the closed state,the valve port will not open.(2)A fluid-solid thermal coupling simulation of the solenoid valve was carried out to obtain the spool and sleeve deformation variables at different temperatures,and then the response characteristics of the solenoid valve after deformation were simulated and calculated.The results show that: the thermal deformation of the material caused by temperature changes will cause significant deformation of the spool diameter and sleeve bore diameter,the maximum deformation is 4.7μm,but the gap change does not exceed 1%;the lower the temperature,the longer the opening response time of the solenoid valve,the outlet flow rate decreases;the oil viscosity changes caused by changes in ambient temperature have a more significant impact on the dynamic characteristics of the solenoid valve.(3)Simulation and analysis of the dynamic characteristics of the solenoid valve under wide temperature domain base vibration,in order to enhance the vibration resistance of the valve using the orthogonal test method to optimize the main structural parameters.The results show that: the spool will not open when the vibration frequency is less than 60 Hz and the vibration amplitude is less than 3mm in the low-temperature closed state;the spool will not open when the vibration frequency is less than 50 Hz and the vibration amplitude is less than 3mm in the high-temperature closed state;the critical vibration amplitude when the spool is opened increases by 20%～40%,and the critical vibration amplitude when the spool is closed increases by 19%～30% year-onyear after optimization.