双质体振动系统的动力学参数设计方法

通过对双质体振动系统的理论分析,得到了振动系统对基础的力传递系数和工作质体的特征幅值与系统动力学参数之间的关系.提出了参振物料系数、临界频率比、临界频率比差和特征幅值增幅度的定义.通过数值分析,确定了满足力传递系数小于10%的参数设计空间.结果表明,隔振频率比越大,力传递系数越小,工作质体的特征幅值越大;当工作质体质量比大于0.57时,特征幅值不会随参振物料增加而增大;工作质体质量比越小,实现低传递系数、高特征幅值及增幅度的参数设计空间越大.最后提出了保证隔振效果、特征幅值及增幅度的动力学参数确定方法.

Design Method of Dynamic Parameters for a Dual-Mass Vibrating System

The relations between force transmission coefficient of the system to its foundation，the characteristic amplitude of the working mass and the system dynamics parameters were deduced by theoretically analyzing a vibrating system with dual masses. Coefficient of vibrating material， critical frequency ratio and its difference， and the increase in characteristic amplitude were defined. Through numeric analysis， the domain where the force transmission coefficient was less than 10% was determined. The conclusions show that with isolation frequency ratio increasing， force transmission coefficient reduces and characteristic amplitude increases. And characteristic amplitude does not increase with adding of vibrating material mass when the mass ratio is more than 0.57. The less mass ratio of the working body is， the larger the possibility of domain with the low force transmission coefficient and large characteristic amplitude is realized. The method to determine the system dynamics parameters is proposed to ensure the vibration isolation effect， the vibrating material of maximum coefficient， the characteristic amplitude and the increase in characteristic amplitude.