斜入射水下复合结构隔声特性研究

基于无限大弹性体和粘弹性体的波传递理论,采用传递矩阵的方法,对斜入射情况下的透射系数和隔声量进行了理论推导,考虑了声波在橡胶中传播所产生的剪切力,并就单层复合结构的隔声性能进行了详细的研究,进而也分析了多层复合结构的隔声性能.分析表明:软质阻尼材料能明显改善结构的隔声性能;相对来说入射角度和材料的厚度对隔声性能的影响比较复杂;而对于多层复合结构而言,面层橡胶的选取尤为重要,一般采用软质橡胶材料来得到大的隔声量.

Investigation of the Sound Insulation of Underwater Compound Structures in Condition of Oblique Incidence

Based on the sound wave transferring theory of infinite elastic and viscoelastic materials, with the method of transferring matrix, the formulas of transmission coefficient and the level of sound insulation are gained, which consider shearing strength in the rubber, and the sound insulation properties of compound structures are discussed in condition of oblique incidence. The conclusions are drawn by analysis: the sound insulation performance of structure is improved by using flexible viscoelastic materials; otherwise it is complicated to sound insulation for incidence angles and the thickness of materials; for multi-layered compound structure, it is important to choose flexible viscoelastic materials as external rubber, which can gain good insulative effect.