材料不连续壳段对圆柱壳结构传播能量流的插入影响

Insert Effects of Finite Region of Material Discontinuity on Propagation of Energy Flow in Circular Cylindrical Shell

运用结构振动的波动方法对有限长的材料不连续区域在圆柱壳中的能量流传播特性进行了研究。详细考察了存在一个不连续区域时 ,区域的长度参数对传播能量流的影响。数值结果表明 :区域的长度较小的对高频入射弯曲波隔振有利 ,区域的长度较大的对低频入射弯曲波隔振有利 ;还详细考察了当管路中存在两个不连续区域时 ,区域的长度参数及布置间距对传播能量流的影响。数值结果表明 :在管路噪声控制设计中宜遵守“隔振软管相异原则”

The propagation characteristics of vibrational energy flow in circular cylindrical shell with finite region of material discontinuity are investigated by wave motion approach.With only one such region in the pipeline of shell,the effects of the region length on the energy flow are examined extensively.The results show that decreasing the length of the region will improve the control effects of high frequency wave,while increasing the length of it will improve those of low frequency wave.The effects of the region length and arrangement distance on the energy flow are also examined extensively,with two regions existing in the pipeline.The “differing rule of two low stiffness pipe sections” is proposed for vibration and noise control design of practical pipe.