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针对硬岩掘进机在掘进过程中产生的随机振动对电磁换向阀的影响,建立了阀在换向以及中位工况下的数学模型,绘制阀芯在换向与处于中位时阀芯位移的功率谱密度图像,结合试验仿真分析了随机振动参数与阀体结构参数对换向阀动态特性的影响规律.研究表明:换向过程中,随着白噪声方差增大,阀芯位移超调量基本不变,稳态下阀芯位移波动幅值呈波动性增加;随着白噪声均值增大,阀芯位移超调量在51%~55%范围内波动,但稳态下阀芯位移波动幅值基本不变;通过减小阀芯质量,增大弹簧刚度与黏性阻尼系数,可以改善阀芯在随机振动下的动态特性;阀芯处于中位时,随着方差与均值的增大,其位移波动更剧烈.
Aiming at the influence of random vibration generated by tunnel boring on the electromagnetic reversing valve in the hard rock tunneling machine, the mathematical model of the valve under commutation and neutral condition is established. When the spool is commutated and in the neutral state, the spool Displacement of the power spectral density images, combined with experimental simulation analysis of the random vibration parameters and structural parameters of the valve dynamic characteristics of the valve.Research shows that: the commutation process, as the white noise variance increases, the valve displacement In the steady state, the fluctuation amplitude of the displacement of the valve core increases in a fluctuating manner. As the mean value of the white noise increases, the displacement of the valve core fluctuates within the range of 51% -55% Displacement amplitude is basically unchanged; by reducing the spool quality, increasing the spring rate and viscous damping coefficient, can improve the dynamic characteristics of spool in random vibration; spool in the center, with the variance and the mean Increase, its displacement more volatile.