水深与腔型对隔声去耦瓦吸声系数的影响

针对水下非均匀阻尼板与多层介质组成的吸声结构进行了研究.基于非均匀波导理论,导出了含空腔隔声去耦瓦的传递矩阵及多层结构表面吸声系数.采用Ansys软件计算了去耦瓦空腔结构在不同静水压力作用下的变形情况,最终得到了含空腔结构隔声去耦瓦的吸声系数随静水压力及腔体形状的变化特性.结果表明,隔声去耦瓦的吸声性能与空腔大小密切相关,是影响其声学特性的主要因素之一;随着水深的增加,隔声去耦瓦的低频吸声性能降低,在实际应用中,不可忽略静水压力对瓦体的影响.

Influence of depth and cavity shape on absorption coefficients of sound-isolating decoupled tiles

An analysis of underwater sound absorption structures made up of non-uniform multilayer damping boards. The transfer matrix of sound-isolating/decoupled tiles with cavities, and the surface absorption coefficient of multilayer structures were derived based on wave-guide theory. The deformation of decoupled tiles with cavity structures by hydrostatic pressure was calculated by Ansys software. Finally, the relationships between the sound absorption coefficient and hydrostatic pressure and cavity shape are obtained for the sound-isolating/decoupled tile with cavity. The results show that the shape of cavities has a great impact on sound-absorption capacity. With increasing depth, the absorbing capacity of sound-isolating/decoupled tiles drops in the low frequency zone. So, in practice, the influence of hydrostatic pressure can not be ignored.