点噪声源在近程声场中传播损失的仿真研究

在分层介质条件下，用本征声线法仿真计算了点声源这距离噪声场的传播损失曲线，仿真结果表明，其传播损失不仅依赖于声速分布，海区深度，海底反射特性等环境条件，也依赖于声源及接收水听器的深度，声传播损失显著不同于球面波衰减规律，其传播损失率差别可达８ｄＢ，这表明在测量舰船目标的辐射噪声声源级时必要的声场校正测量是必须的。

A simulation study on the transmission loss of short-range field for a point noise source

Under the condition of a layered medium, the curves of the transmission loss of short range field for a point noise source are simulated, using the method of the eigen ray. According to the results of the simulation, the transmission loss not only depends on the environmental conditions including the velocity profile, the depth of water, the property of reflection from the sea bottom, etc., but also is related to the depths of the sound source and the receiver hydrophone. The behavior of the present transmission loss is obviously different from the law of spherical wave propagation loss. The difference between them could be as large as about 8dB. This indicates that it is necessary to calibrate the sound field when the noise level radiating from a vessel is being measured.