舰船隔振中多层衰波媒质的声传递特性分析

Acoustics transmission characteristics analysis of multilayered wave-attenuation medium in warship vibration isolation

文章研究了多层衰波媒质结构在斜入射声波作用下,各层媒质的几何参数变化对其衰波作用的影响规律。应用建立的二维传递矩阵数学模型计算了多层衰波媒质结构对垂直入射声波的衰波系数,并与实验结果进行了比较。结果表明,计算结果与实验结果基本一致。同时利用此数学模型分析了媒质总厚度、各层厚度比及声波入射角度对声强透射和反射系数的影响。分析结果表明,各因素变化对结构中波传递特性影响较大,且在一定程度上增加结构总厚度和首层媒质厚度有利于增强结构的衰波性能,特别是增强低频区衰波性能。

The effects on wave attenuation properties by changing geometrical parameters of each layer medi⁃um of the multilayered structure are studied in this paper in the condition of oblique incidence.A two-dimen⁃sional transfer matrix model is presented to calculate the attenuation coefficient of the multilayered structure.Calculation results at normal incident are compared with experimental results.It is shown that the calculation results are in agreement with the experimental results.The effects of geometrical parameters of each layer me⁃dium on the reflection and transmission coefficient are analysed,the results show that the medium thickness,the proportion and the angle of incidence have great effects on the properties of wave transmission.And in⁃creasing the thickness of structure and the first layer has advantage of advancing the wave attenuation proper⁃ties,especially those of low frequency range.