刚性阻振质量阻隔振动波传递特性数值研究

基于阻抗失配原理,从波动角度分析了刚性阻振质量阻隔振动波传递的特性,并利用有限元法数值研究了重量及截面形状参数对刚性阻振质量隔振性能的影响。结果表明:刚性阻振质量能有效隔离中高频振动波的传递,且其重量越大,隔振效果越好,而对低频振动波则几乎不起隔离作用;对于矩形截面的刚性阻振质量,适当增大其截面高度同时减小截面宽度,可有效提高刚性阻振质量的隔振降噪效果,这对刚性阻振质量在船体结构减振降噪中的应用具有一定的参考意义。

Impediment to Vibration Wave Propagation from Rigid Vibration Isolation Mass

Based on the impedance mismatching principle,the performance of rigid vibration isolation mass in impeding vibration wave propagation was discussed by the wave theory.The influence of its weight as well as cross-section shape parameters on the isolation performance of rigid vibration isolation mass was studied by using Finite Element Method.The results show that the rigid vibration isolation mass can effectively impede the vibration wave propagation in the medium-high frequency range,and the heavier the vibration isolation mass applies and the better the isolation performance achieves.While for the low frequency wave,its vibration isolation effect is not so obvious.For the vibration isolation mass with rectangular section,its noise and vibration isolation performance can be effectively improved by in-creasing the cross-section height and reducing the cross-section width properly.This study provides guidance for the application of rigid vibration isolation mass to the vibration and noise reduction of ship structure.