Sea surface and bottom constituted sound propagation environment of the neritic acoustic duct field.
海面与海底构成了声源浅海海域波导场的声传播环境。
The two-microphone method is investigated for the objective of in situ measuring the impedance of an acoustic liner in a duct.
对现场测量管道声衬声阻抗的双传声器法进行了研究。
The sound radiated from the exit was linked with the sound source characteristic of diesel engine, and the sound field in the exhaust duct by means of the acoustic transfer matrix method.
并用声学传递矩阵方法建立了柴油机源特性，管内声场与管口辐射噪声的关系。
A lot of noise experimental researches on noise suppression have been carried out successfully by the aid of acoustic liner or appropriate increase of the duct length.
并用消声声衬及适当增加管道长度的方法进行了大量的实验研究，取得了良好的效果。
A lot of noise experimental researches on noise suppression have been carried out successfully by the aid of acoustic liner or appropriate increase of the duct length.
并用消声声衬及适当增加管道长度的方法进行了大量的实验研究，取得了良好的效果。
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