基于AMESim的平衡阀动态性能分析

Working Properties of Counterbalance Valve Based on AMESim Code

分析了一种新型平衡阀的静态性能,得到承载能力与主阀芯弹簧刚度K、流量q、节流系数的倒数Cq-1、节流口水力周长倒数w-1、油液密度平方根ρ0.5、节流口压差Δp的乘积以及负载液压缸有效直径与液压缸伸出杆有效直径之比R呈正比。运用AMESim进行动态模拟,分析结果表明增大控制压力pc可以加快负载稳态运行速度,但不会对负载动态性能造成较大影响;减小主弹簧刚度K可以加快负载运行速度,却会使负载动态变化时间加长;负载质量M的变化会对速度的动态过渡时间产生影响,却不影响负载最终运行速度;主阀芯右侧端面直径D的变化对负载动态特性的变化无显著影响;减小负载液压缸有效直径与液压缸伸出杆有效直径之比R可以加快负载速度,但对速度动态过渡时间无影响。

Static property of a type of speed compensation valve was analyzed.It was found that the load capacity was in proportion to main valve spool spring stiffness K,throttling flow rate q,inverse of throttling coefficient Cq-1,inverse of hydraulic perimeter of throttling port w-1,square root of oil density ρ0.5,throttling differential pressure Δp,ratio of rod diameter and piston diameter of load hydraulic cylinder R.The model used to study the dynamic property of the speed compensation valve was built by AMESim dynamic simulation code.By the results with the dynamic simulations of the model,it was observed that increasing control pressure pc could improve the steady speed magnitude of load,but had no effect on the transition time to reach steady speed.Decreasing spring stiffness K of main spool could improve the speed of load and increase the transition time.Increasing the mass of load would lengthen the transition time correspondingly,but had no effect on the final steady speed magnitude.The variation of taper spool diameter D almost had no influence on load dynamic property.Decreasing the ratio of rod diameter and piston diameter R would increase the final steady speed magnitude of load,but had no influence on the transition time of load speed.