期刊
APPLIED ACOUSTICS
卷 69, 期 12, 页码 1240-1248出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2007.10.002
关键词
Impedance tube; Complex transmission coefficient; Four-microphone method; Multilayer acoustical panel; Transmission-reflection wave
类别
资金
- Specific Subject Scientific Research Foundation of University Philosophy Doctoral Station [20040248011]
In order to improve the measuring precision of complex transmission coefficients in impedance tube, the influence that comes from the transmission-reflection wave in the transmission tube is analyzed, and the modified formulas of complex reflection and complex transmission coefficients are proposed. With the experiment of organic glass, it can be confirmed that the modified formulas are useful and call decrease the demand of the tube end. Through the measurement of the complex transmission coefficients of multilayer acoustical panel, the complex transmission coefficients of multilayer both forward and backward incidences are definitely the same in theory either normal or oblique incidence. When sound wave is normal incidence, the method is also verified to be correct with experiments in impedance tube. (C) 2007 Elsevier Ltd. All rights reserved.
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