›› 2012, Vol. ›› Issue (03): 545-550.

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Estimation of acoustic characteristic of porous material based on in-situ measurement

WANG Bin-xing, ZHENG Si-fa, LIU Hai-tao, LIAN Xiao-min   

  1. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
  • Received:2011-02-12 Online:2012-05-01

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Abstract: A method to estimate the characteristic impedance and the wave number of porous material was proposed based on in-situ measurement. The feature of the PU probe which can measure the pressure and the particle velocity at one point simultaneously was used to measure the surface impedances of porous material at different boundary conditions by means of the principle of the 2-cavity method, and the characteristic impedance and the wave number were abtained by calculation. Different boundary conditions were compared and suitable boundary condition combination was determined. With the comparison of measurement data and calculation results, the method proved to be accurate and of practical use. Compared to the methods based on the impedance tube, it is more convenient.

Key words: vehicle engineering, porous material, acoustic characteristic, in-situ measurement

CLC Number: 

  • U465
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