Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/85650
Title: A method of measuring acoustic absorption coefficient of a material specimen using a dynamic microphone
Authors: Xie, Jin.
Ling, Shih Fu.
Keywords: DRNTU::Engineering::Mechanical engineering
Issue Date: 2012
Source: Xie, J., & Ling, S. F. (2012). A method of measuring acoustic absorption coefficient of a material specimen using a dynamic microphone. Journal of mechanical science and technology, 26(3), 741-748.
Series/Report no.: Journal of mechanical science and technology
Abstract: This paper reports the development of a method for measuring the absorption coefficient of a material specimen mounted at one end of a planar wave tube using a dynamic microphone at the other end. In the proposed method, the dynamic microphone mounted is used as an actuator (loudspeaker) to generate sound waves and simultaneously performs as a probe to sense acoustic impedance at the same point. For the electro-mechanical acoustical system formed by the dynamic microphone and the tube, a “transduction matrix” is introduced to relate the input electrical variables (voltage and current) and the output acoustical variables (pressure and particle velocity). Once the matrix is calibrated, probing the input voltage and current to the dynamic microphone alone allows quantitative evaluation of the acoustic impedance of material specimen, from which absorption coefficient of the material is calculated. Measurements of fully-reflected end, anechoic end and a porous material specimen are carried out and compared to the results obtained by the conventional transfer function method. It is found that the results match well with each other in a frequency range depending on the length of the tube.
URI: https://hdl.handle.net/10356/85650
http://hdl.handle.net/10220/18094
DOI: 10.1007/s12206-011-1235-9
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MAE Journal Articles

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