被减振物体连接于弹性地基时动力吸振器的设计

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当被减振物体连接于弹性地基时,定义被减振物体与弹性地基连接点处的动刚度,给出被减振物体幅频响应和振幅放大系数的计算公式。利用有限元方法计算不同弹性特性的地基与被减振物体连接点处的动刚度。分析被减振物体与弹性地基连接点处的动刚度对被减振物体振动的影响。计算结果表明：当连接点处的动刚度大于50倍的被减振物体与弹性地基的连接刚度时,可基本忽略弹性地基对吸振器设计的影响。该计算方法和相关结论可为被减振物体连接于弹性地基上时,动力吸振器的设计提供借鉴。 The method of designing a vibration absorber for a body mounted on a flexible foundation was presented. The foundation flexibility was modeled with the linking point mobility or dynamic stiffness between the body and the flexible foundation. The formulae for calculating frequency responses of the body were deduced considering the flexible foundation. The frequency response of the body was calculated and listed for different foundation flexibilities, and compared with that for the rigid foundation. It was concluded that when the dynamic stiffness of the foundation is 50 times larger than the linking stiffness between the body and the flexible foundation, the effect of the flexible foundation on the absorber design can be neglected. The proposed method and the conclusion here were instructive for designing vibration absorber if a body is mounted on a flexible foundation.