Journal of KSNVE (소음진동)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
권호 표지

A New Method for Measuring Characteristic Impedance and Propagation Constant of Sound-Absorbing Materials

흡음재의 특성임피던스와 전파상수의 새로운 결정방법

  • 황철호 (한국표준과학연구원 음향.진동그룹) ;
  • 정성수 (한국표준과학연구원 음향.진동그룹) ;
  • 은희준 (한국표준과학연구원 음향.진동그룹)
  • Published : 1997.10.01
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Abstract

A new method is presented to determine two fundamental acoustic quantities of sound-absorbing materials such as characteristic impedance and propagation constant. In this study, the surface acoustic impedances of sound-absorbing materials are measured using the impedance tube and the anechoic chamber to determine the above acoustic quantities. The measured results are given for two typical sound-absorbing materials(glass wool and urethane foam) int the frequency range between 150 and 1, 600 Hz. The results are verified by other two known methods, which are Smith & Parrott method and Utsuno et al. method. The absorption coefficients calculated from the empirical models(Miki model for glass wool and Jung model for urethane foam) and two quantities by present method are in good agreement with the measured values.

Keywords

References

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