文章摘要
俞悟周,王佐民.存在气流的消声扁管道声学特性的实验研究[J].声学技术,1996,(3):105~108
存在气流的消声扁管道声学特性的实验研究
Measurement of attenuation characteristics in absorbent narrow duct with mean flow of diff erent velocity
投稿时间:1996-01-30  
DOI:
中文关键词: 相关技术  声学测量
英文关键词: correlation technique  aco ustical measurement
基金项目:国家自然科学基金
作者单位
俞悟周 同济大学声学所, 上海 200092 
王佐民 同济大学声学所, 上海 200092 
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中文摘要:
      本文利用M序列相关技术能有效地抑制背景噪声的特点,对不同气流下的扁消声管道的声学特性做了实验研究。对插入损失和传递损失随气流马赫数的变化,进行了M序列法测量,并与理论值及传统方法测量值做比较。实验表明,存在气流时,消声特性的M序列相关技术测量结果,比传统方法具有更高的可信度。
英文摘要:
      Experimental research has been done on the a coustical reduction characteristics of absorbentduct with mean flow of different velocity.Transmission loss and insertio nloss are measured by using M-sequence correlation method and traditional method in the ductrespectively.Due to the M-sequence correlation technique can effectively surpress the regenerated noise caused by the flow in the duct,there fore the results of M-sequence correlation method are more reliable than those of traditional method.
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