摘要
从振动能量传播的途径出发,以阻隔质量刚性隔振为例,研究结构发生突变反射弹性振动波的规律,阻隔质量的存在对弯曲波有较好的反射和阻碍作用,隔声量与阻隔质量的几何形状和质量分布以及结构中弯曲波波长有关,低频段、方钢的隔声效果较差,高频段效果较好;存在全透射和全隔离的频率;根据不同的频率选择合适的阻隔质量截面尺寸以达到较好的隔声效果。
From the transmission process of vibration energy, the rules of obstruct in reflecting structure vibration waves were studied. The obstruct is helpful in reflecting and obstructing the bending waves, so as to isolate structural acoustics and to reduce the noise radiation. The noise insulation factor is relative with the geometry, mass distribution and bending wave length in the structure. There exist the complete transmission and isolation frequency. At the low frequency, obstruct has bad noise isolation effect, and good at the high frequency. In order to obtain the better noise isolation effect, it is necessary to select the appropriate section size.
出处
《船海工程》
北大核心
2006年第4期31-34,共4页
Ship & Ocean Engineering
关键词
结构噪声
阻隔质量
弯曲波
反射系数
透射系数
隔声量
structural acoustics obstruct bending wave reflectance coefficient transmission coefficient noise insulation factor
