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为了获得空气中远距离声源激发水下声场的精细结构,2013年3月,声场声信息国家重点实验室在南海海域进行了一次空气中声源激发水下声场的实验。采用汽笛作为空气声源,海底放置水听器作为接收,在实验过程中,发射船由距离水听器2.4 km处行驶至9.8 km。本文对该次实验数据进行分析,获得了收发距离远达9.8 km、频率分别为128 Hz和256 Hz的声传播损失曲线,该曲线随传播距离变化存在清晰的震荡结构.利用波数积分方法计算实验环境下的水下声场理论值,并对获得的声场传播特性进行了较好的物理解释。
In March 2013, the State Key Laboratory of Sound Field Acoustics conducted an experiment on underwater sound field excitation in the air of the South China Sea in order to obtain the fine structure of underwater acoustic field stimulated by long-distance sound sources in the air. A siren was used as the air source, and a hydrophone was placed on the seafloor to receive it. During the experiment, the launch vessel was propelled to a distance of 2.4 km from the hydrophone to 9.8 km. In this paper, we analyze the experimental data and get the acoustic propagation loss curve with the transmission and reception distances as high as 9.8 km and the frequencies of 128 Hz and 256 Hz, respectively. The curve has a clear oscillatory structure with the propagation distance variation. Environment underwater acoustic field theory value, and obtained the sound field propagation characteristics of a good physical explanation.