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基于无限大分层介质波传递理论,采用传递矩阵方法和声能量分布理论,开展了水下复合阻尼结构隔声特性的研究。仿真结果表明橡胶材料属性对结果隔声有很大的影响。软和小泊松比的橡胶可以明显提高结构的隔声特性。多层橡胶复合结构在隔声方面比单层复合结构具有更大的优势,在多层橡胶中打孔可有效提高结构的隔声性能。空腔越多,隔声特性越好。蜂窝三明治复合结构的隔声特性要好于含圆柱空腔复合结构的隔声性能和多层均匀复合结构。结合现有的试验条件,在消声水池开展了蜂窝三明治复合结构自由场大样测试,实验结果表明,测量值与理论预测有很好的一致性。
Based on the theory of infinite layered medium wave propagation, the acoustic properties of underwater composite damping structures are studied by using transfer matrix method and acoustic energy distribution theory. The simulation results show that the rubber material properties have a great influence on the sound insulation of the result. Soft and small Poisson’s ratio rubber can significantly improve the sound insulation properties of the structure. The multi-layer rubber composite structure has more advantages in sound insulation than the single-layer composite structure. The perforating in the multi-layer rubber can effectively improve the sound insulation performance of the structure. The more cavities, the better the acoustic properties. Honeycomb sandwich composite structure is better than the acoustic properties of composite structure with cylindrical cavity sound insulation performance and multilayer uniform composite structure. Combined with the existing experimental conditions, a large sample of honeycomb sandwiches in the free-field test was carried out in a muffler basin. The experimental results show that the measured values are in good agreement with the theoretical predictions.