三质体振动机动力学参数对其性能的影响分析

Effects of dynamic parameters on the performance of a three-mass vibrating machine

提出了工作质体无量纲特征幅值、特征幅值放大倍数、最大参振物料系数、隔振架与基础之间的力传递系数、同步能力系数和临界隔振频率比作为描述三质体振动机的性能指标。通过数值计算,研究了系统动力学参数对振动机各性能指标的影响规律。当工作质体工作于超共振态时,特征幅值和力传递系数随隔振频率增加而减小。当隔振频率比相同且大于临界隔振频率比时,随工作质体与隔振质体质量比的减小,初始特征幅值和最大力传递系数增大,特征幅值放大倍数和最大参振物料系数略有减小,即较小的工作质体与隔振质体质量比,有利于提高振动机的综合性能指标。振动激励角越小,系统同步能力系数越大。当支撑刚体作为物料箱时,同步能力系数随工作质体与激振器安装刚体的质量比的增加而增大。系统结构能够满足两激振器自同步运行的稳定性要求,计算机仿真结果验证了理论研究的正确性。

The dimensionless characteristic amplitude of working mass （DCAWM）,the magnification coefficient of characteristic amplitude （MCCM）,the maximum coefficient of vibration of material （MCVM）,the force transfer coefficient between vibration isolation frame and foundation （FTCBVIFF）,the synchronization ability coefficient （SAC）, and the critical frequency ratio of vibration isolation mass（CFRVIM）were proposed to describe the performance of a three-mass vibrating machine.The effects of dynamic parameters of system on the performance of the vibrating machine was investigated by numeric method.When the working mass operates in a state of supper resonance,the DCAWM and the FTCBVIFF decrease with the increase of frequency ratio of vibration isolation mass （FRVIM）.When the FRVIM is greater than the CFRVIM,with the increase of the FRVIM,the initial DCAWM and the maximum FTCBVIFF increase, and the MCCMand the MCVMdecrease.Hence,the smaller the FRVIM is,the better the performance of the vibrating machine is.The smaller the exciting angle is,the bigger the synchronization ability coefficient of the two exciters is. When the supporting rigid body serves as material box,the synchronization ability coefficient increases with the increase of the ratio of the working mass to the mass of exciter installation body.The structural parameters of the system can satisfy the synchronization stability criterion.Anumerical simulation verifies the theoretical investigation results.