소음진동 (Journal of KSNVE)

한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
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두개의 마이크로폰을 이용한 흡음재의 음향특성 조사

A Study on the Acoustical Characteristics of the Absorbent Materials Using Two Microphones

  • 정성수 (한국표준과학연구원, 음향진동그룹) ;
  • 황철호 (한국표준과학연구원, 음향진동그룹)
  • 발행 : 1996.04.01
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초록

A free field method using two microphones is used for measuring surface impedance and absorption coefficient of the absorbent materials. It is shown that this method can be performed in a large non-anechoic room. Precise values of the surface impedance can be obtained by changing the spaces between the two microphones. Comparison between experimental values of the surface impedance of the glass wool and the mineral wool and Miki's empirical model shows agreement.

키워드

참고문헌

  1. Sound Absorbing Materials Zwikker, C.;Kosten, C. W
  2. J. Acoust. Soc. Am. v.28 Theory of Propagation of Elastic Wave in a Fluid Saturated Porous Solid Biot, M. A
  3. J. Acoust. Soc. Am. v.73 Propagation of Sound in Highly Porous Open-Cell Foams Lambert, R. F
  4. J. Acoust. Soc. Am. v.79 Acoustical Properties of Partially Reticulated Forams with High and Medium Flow Resistance Allard, J. F.;Aknine, A.;Depollier, C
  5. Applied Acoustics v.3 Acoustical Properties of Fibrous Asorb ent Materials Delany, M.E.;Bazley, E. N
  6. J. Acoust. Soc. Jpn(E) v.11 Acoustical Properties of Porous Materials-Modifications of Delany-Bazley Models- Miki, Y
  7. J. Acoust. Soc. Am. v.91 New Empirical Equations for Sound Propagation in Rigid Frame Fibrous Materials Allard, J. F.;Champoux, Y
  8. Standard Methdos for Impedance and Absorption of Acoustical Materials by the Impedance Tube Method ASTM C 384-90a
  9. J. Acoust. Soc. Am. v.61 Experimental Determination of Acoustic Properties Using a Two-Microphone Random-Excitation Seybert, A. F.;Ross, D. F
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  11. J. Sound Vib. v.67 An Impluse Method of Measuring Normal Impedance at Oblique Incidence Davies, J. C.;Mulholland, K. A
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  13. Noise Control Engineering Journal v.32 In Situ Two-Microphone Technique for the Measurement of the Acoustic Surface Aimpedance of Materials Allard, J. F.;Campoux, Y
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  15. J. Acoust. Soc. Am. v.80 Transfer Function Technique of Impedance and Absorption Measurements in an Impedance Tube Using a Simgle AMicrophone Chu, W. T