强冲击下先导式溢流阀先导阀芯自激振动仿真

Simulation of self-excited vibration behavior of pilot valve core on pilot-operated pressure relief valve with strong vibration

针对硬岩掘进机在掘进过程中切割硬岩地质会产生强冲击振动的工况,分析了液压系统中的先导式溢流阀的数学模型,建立了该阀在强振动环境下的动力学仿真模型.获得不同工作条件下,先导式溢流阀先导阀芯的动力学行为规律.仿真结果表明:当系统稳定时,先导阀芯受干扰小,系统会衰减振动至稳定;但当干扰幅值超过临界值时,系统会进入极限环的吸引域,产生周期性振动;通过增加先导阀阀口直径、弹簧刚度和减小先导阀半锥角,可增强溢流阀的抗干扰能力.

As in the tunnel boring machine tunneling process,the cutters,which is on the disc,will cut the hard rock directly,the mathematical model of the pilot-operated pressure relief valve was analyzed,which was used in the hydraulic system,and the dynamics simulation model with strong vibration environment was built.Working state of the system was discussed.The simulation result show that,when the system is stable,the pilot valve affected by small interference,the system will attenuate vibration to the stable,but when the interference exceeds the critical value,the system generates periodic oscillation because it enter the domain of attraction of limit cycles,by increasing the spring rate and port diameter of the pilot valve,and reducing half cone angle of pilot valve,the anti-jamming capability of relief can be enhanced.