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。
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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