基于AMESim的新型双阀芯系统建模及特性分析

Modeling and characteristic analysis of new-type twin-spool system based on AMEsim

应用大型液压系统仿真软件AMESim10.0建立了工程机械双阀芯液压系统模型,通过双阀芯模型不同参数下的阀口流量响应特性,得出了反馈通道增益、先导阀阻尼系数变化与双阀芯系统时域响应的关系,并且得出了先导阀阀芯位移响应特性;通过双阀芯开环系统频率特性分析,得出了闭环系统的稳定裕度,及较优的PID控制参数。研究结果表明,双阀芯系统反馈通道增益与流量响应成反比,流量超调量与阀芯阻尼系数成反比,较优值为80N·s/m;通过系统PID参数的优化,双阀芯系统可以达到较好的稳定裕度。

The model of a mechanical twin-spool hydraulic system was built by using AMEsim10.0.Through the different flow response characteristic at valve port in the model at different parameters,the feedback channel gain and the variation of damping coefficients of pilot valve with time-domain response of twin-spool system were obtained,and the displacement response characteristic of spool of pilot valve.After the analysis of frequency characteristic of twin-spool open-circuit system,the stability margin of the closed-circuit system was obtained,and the better PID control parameters were obtained.The analysis results showed：the feedback channel gain of the twin-spool system was inversely proportional to flow response;flow overshoot was proportional to the damping coefficient of the spool,and the optimal value was 80 N/（m/s）;through the optimization of system PID parameter,twin-spool system could achieve better stability margin.