水下穿孔板结构的透声特性研究

穿孔板结构在水下有着非常广阔的应用前景,但是目前相关的研究报道非常少。基于空气中穿孔板吸声理论,综合考虑小孔的末端修正,给出了较为准确的水下穿孔板声阻抗表达式。利用传递矩阵法分析了水下穿孔板结构的声压透射特性,得到了垂直入射声压透射公式。对影响穿孔板结构透声性能的主要因素进行了详细的仿真分析,得到了一些重要的结论。采用四传感器测量方法在驻波管中对自制的穿孔板结构进行了测试,实验结果与理论分析基本一致,从而验证了理论分析的正确性。本文为水下穿孔板结构的设计提供了详细的理论和实验依据。

Research on the transmission characteristics of underwater perforated-panel structure

Perforated-panel structures have wide potential application under water. But up to now the correlative research is few. The acoustic impedance of underwater perforated-panel is obtained based on the theories for air perforated-panel absorption. Theoretically the sound transmission characteristics of underwater perforated-panel structures are analyzed by the transfer matrix method. The normal incidence sound transmission coefficients are given. The main factors that have effects on the acoustic transmissions are analyzed by simulation, and some important results are obtained. The perforated-panel structures made by ourselves were tested in a standing-wave tube by the four-microphone transfer-function method. The experimental results are approximately in accord with the results obtained by theoretical analysis, which have proved that the theories are correct. This paper has supplied theoretical and experimental bases for the design of underwater perforated-panel structures.