质心位置偏移对隔振系统解耦度的影响

Effect of Centroid Position Offset on Vibration Isolation System Decoupling Degree

隔振系统质心位置的偏移直接影响着系统的解耦,为了定量确定偏移量对解耦度的影响,根据隔振理论,利用数值计算方法,在以垂向解耦度为目标的情况下,分别计算系统质心沿水平x方向、水平y方向和同时沿水平x、y方向偏移三种情况下,偏移量和解耦度之间的关系曲线。结果表明:在隔振器动刚度变化15%以内,质心位置尽量靠近弹性中心有利于系统解耦;质心位置偏移量控制在两个跨距最短隔振器距离的5%以内,可以保证系统有80%以上的解耦度。并结合试验验证理论推导结果的正确性。

To determine quantitatively the effect of eentroid position offset of vibration isolation system on decoupling degree, based on the vibration isolation theory and using numerical method, the relationship curves of offset and decoupling degree were plotted for vertical direction decoupling degree, under centroid position deviating along horizontal x direction, y direction and both x ,y directions. Results show that centroid position as close to elastic center as possible is beneficial to the system decoupling when isolator dynamic stiffness changes in 15%; the system will have above 80% decoupling degree if the centroid position offset is controlled in 5% of the minimum span between two isolators.