基于回油液阻的压力伺服阀啸叫分析

Analysis on whistle of pressure servo-valve based on oil-return resistance

对压力伺服阀的啸叫问题进行仿真与试验分析,验证了滑阀级回油液阻增大会引起伺服阀啸叫.基于机电系统分析软件AMESim建立压力伺服阀完整的仿真模型,对比分析仿真与试验的动静态特性曲线,验证仿真模型的正确性.分析滑阀级不同的回油液阻对衔铁组件中弹簧管振荡幅值的影响;剖析产生自激振荡的条件和本质原因;探究伺服阀内部振荡的传递路径.研究发现,伺服阀滑阀级回油液阻的变化,会引起力矩马达衔铁组件的自激振荡,通过合理优化滑阀阀芯回油间隙可以避免这部分伺服阀振荡啸叫;通过增大滑阀至喷嘴腔容积也可以切断振荡传递以消除伺服阀振荡啸叫.

Simulation and experiment analyses were conducted on the whistle of the pressure servo-valve,and it was verified that the increase of the oil return resistance of the valve spool would cause whistling.A complete simulation model of the pressure servo-valve was built based on the electromechanical system analysis software,AMESim platform.The validity of the simulation model was verified by comparing the dynamic and static characteristic curves of the test and the simulation model.The effect of oil return resistance at different valve spool levels on the oscillation amplitude in spring tube in armature assembly were analyzed.The conditions and essential causes of selfexcited oscillation were explored.The transmission path of internal oscillation of the servo valve was analyzed.Results show that the change of the oil return resistance of the servo valve spool will cause the self-oscillation of the torque motor armature assembly,and the oscillating howling of the servo valve can be avoided by reasonable optimization of the oil return gap of the valve spool.By increasing the chamber volume between the valve spool and the nozzle,the oscillation transmission path can also be cut off to eliminate the oscillating howling of the servo valve.