变频液压可控周期性激振测试系统设计与仿真  

Design and Simulation of Active Hydraulic Excitation System Based on Frequency Conversion

作　　者：寇子明[1] 张慧贤[1,2] 廉红珍[1,3] 魏秀业[4] 

机构地区：[1]太原理工大学机械工程学院,太原030024 [2]黄淮学院电子科学与工程系,驻马店463000 [3]山西省矿山流体控制工程中心,太原030024 [4]中北大学机械工程与自动化学院,太原030051

出　　处：《农业机械学报》2011年第5期226-230,197,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(50775154)

摘　　要：为研究能够人为产生和主动控制的液压激振水击波,首先建立了系统数学模型,设计了变频液压激振测试系统。然后通过给定的偏微分运动方程,采用矩形网格特征差分法编程求解出激波器在变频条件下产生的激振压力和流速沿管道断面随时间的变化情况。数值模拟表明沿管道各断面输出的为简谐振动,且油缸处激振压力和流速随激波器频率的增大而增大。系统实测数据与仿真结果接近,说明通过对激波器进行调频可以实现对液压缸激振压力和运动频率的可控调节,为液压激振的振动特性及可控性研究提供了部分理论依据。To study the artificially produced and actively controlled water hammer wave generated by hydraulic vibration exciter,a mathematical model was established and an experimental system was designed to verify it.Through the given partial differential equations,a computer code based on the method of characteristics was developed to calculate transient pressure and flow velocity distributed along the pipe.The numerical simulations showed that a simple harmonic motion rose at every cross section of the pipe.Meanwhile,the excitation pressure and flow velocity at hydraulic cylinder increased as the rising rotational frequency of vibration exciter.Moreover,measured data was basically consistent with the numerical simulations.It indicated that the excitation parameters of hydraulic cylinder could be controlled almost linearly via adjusting the rotational frequency of vibration exciter.So,this work is expected to study vibration mechanism of a new hydraulic excitation system and play an experimental guiding role to further research in future.

关 键 词：液压激振 水击 特征线法 变频 激波器 测试系统 

分 类 号：TB534.2[理学—物理]