Journal of KSNVE (소음진동)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Sound Propagation in Circular Duct Lined with Elastic Porous Noise Control Materials

소음제어용 탄성다공물질이 대어진 원형덕트 내의 음파전달

  • 정인화 (서울대학교 대학원 기계설계학과 대학원) ;
  • 강연준 (서울대학교 공과대학 기게항공공학부)
  • Published : 1999.04.01
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Abstract

In this paper, a circular lined-duct is modeled by using an axisymmetric foam finite element, which is based on elastic porous material theory of Biot. For various thicknesses of three kinds of lining materials, finite element predictions are compared with measurement results and Morse's analytical results. While the analytical model has larger error as the lining becomes thicker, results of the present model have a good agreement with experimental results for all the thicknesses considered here. It has also been found that constraining the axial motion on the circumferential surface of the lining enhances sound attenuation at low freqneucies.

Keywords

References

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