二通插装阀非线性动力学行为

Nonlinear Dynamics Behaviors of Two-way Cartridge Valves

为研究二通插装阀主阀芯在压力脉动条件下开启过程中的非线性振动问题,考虑管道容积效应,建立了插装阀主阀芯动态过程的非线性动力学模型,利用MATLAB/Simulink进行了数值仿真。首先根据模型中油源压力不存在脉动项和存在脉动项两种情况,通过时域图以及相图研究了插装阀主阀芯的开启特性;然后,在考虑油源压力脉动的条件下,分析了油源的不同压力等级对插装阀主阀芯动力学行为的影响;最后,针对不同管道长度,研究了管道长度对插装阀主阀芯动力学行为的影响。结果表明:油源压力脉动会引起插装阀主阀芯出现振动行为;在相同油源压力脉动条件下,随油源压力增大,主阀芯振动行为减弱,不易发生碰撞行为;泵出口到阀组间管道长度越长,主阀芯越容易发生非线性振动行为,并伴随着阵发性振动行为的产生。研究结果为探究大型插装阀的失稳机理提供了理论依据。

In order to study the nonlinear vibration problems of the valve spools in the direction control circuit of two-way cartridge valves during the opening processes with pressure fluctuations,considering the pipeline volume effects,a nonlinear dynamics model of valve spools was established,and the numerical simulation was carried out by MATLAB/Simulink. Firstly,according to the model oil source pressure fluctuations existing or not,the opening characteristics of valve spools were studied by means of time domain diagram and phase diagram. Furthermore,in the conditions of oil source pressure fluctuations,the influences of different pressure grades of oil source on the valve spool were analyzed. Finally,for different pipe lengths,the influences of pipe length on the dynamics behaviors of valve spools were studied. The results show that the vibration behaviors of valve spools may be caused by the pressure fluctuations of oil source. In the same pressure fluctuations of oil source,the vibration behaviors of valve spools are weakened with the increase of oil source pressures,which is not easy to collide. Increasing the pipe lengths between pump outlet and valve group,the nonlinear vibration behaviors of valve spools are easily occured,accompanied by paroxysmal vibration beharior. The research provides a theoretical basis for the instability mechanism of large cartridge valve.