摘要
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．
Focusing on the impact of random vibration on the performance of the solenoid directional valve in the tunnel boring machine tunneling process, the mathematical model was established and the figure of power spectrum density of spool displacement was drew on the occasion of commutation or middle position. The dynamic characteristics of valve under the parameter of random vibration and valve＇s structure were analyzed by simulation and trial. The results show that, as the variance of white noise increases in the process of commutation, the overshoot of spool displacement keeps basi- cally unchanged and the fluctuation amplitude of spool displacement grows with fluctuations in steady state. As the mean value increases, the overshoot of spool displacement fluctuates from 51~ to 55 ~//0, the fluctuation amplitude of spool displacement is basically unchanged. The dynamic characteristics can be improved by reducing the spool mass and increasing the spring stiffness and viscous damping coefficient. When the valve is in middle position, the fluctuation of spool displacement is more re- markable as the variance or mean value grows.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第6期13-17,51,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家重点基础研究发展计划资助项目(2013CB035404)
关键词
电磁换向阀
随机振动
动态特性
硬岩掘进机
超调量
仿真
solenoid directional valve
random vibration
dynamic characteristics
tunnel boring ma-chine
overshoot
simulation
