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Theory of microslit absorbers 被引量:1

Theory of microslit absorbers
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摘要 It is well known that narrow slit may be used as acoustical element. The exact formulae of the acoustical impedance of a narrow slit and its low-frequency approximation are available. The theory of slit is extended and a simple and practical formula is derived for the single slit. It is found that the resistance- to- reactance ratio of the slit increases to larger than one when the slit width is decreased to submillimeter range, and a panel with extremely narrow slits plus a back cavity will make an absorber with good absorption in a wide frequency range, without any porous or fibrous material. A complete theory of the microslit absorber (MSA) is, thus, presented and its absorption characteristics discussed. It is found that the MSA has essentially the same formulae as the microperforate absorber (MPA), except that the numerical coefficient of the resistance is smaller and the end correction for the mass reactance is larger for the MSA, resulting a performance inferior to that of MPA, ordinarily. Measures are proposed to compensate for these. It is well known that narrow slit may be used as acoustical element. The exact formulae of the acoustical impedance of a narrow slit and its low-frequency approximation are available. The theory of slit is extended and a simple and practical formula is derived for the single slit. It is found that the resistance- to- reactance ratio of the slit increases to larger than one when the slit width is decreased to submillimeter range, and a panel with extremely narrow slits plus a back cavity will make an absorber with good absorption in a wide frequency range, without any porous or fibrous material. A complete theory of the microslit absorber (MSA) is, thus, presented and its absorption characteristics discussed. It is found that the MSA has essentially the same formulae as the microperforate absorber (MPA), except that the numerical coefficient of the resistance is smaller and the end correction for the mass reactance is larger for the MSA, resulting a performance inferior to that of MPA, ordinarily. Measures are proposed to compensate for these.
出处 《Chinese Journal of Acoustics》 2001年第1期1-10,共10页 声学学报(英文版)
基金 This WOrk was supported by the National Natural Science FOundation of China.
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参考文献3

  • 1MAA Dah-You,LIU Ke.Sound absorption characteristics of the microperforate absorbers forrandom incidence, Chin[].The Journal of The Acoustical Society of America.2000
  • 2Lord Rayleigh. Ibis . 1929
  • 3MAA Dab-You.Theory and design of mocroperforated panel sound absorption constructions[].Scientia Sinica.1975

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  • 1Leistner P,Hettler S.Sound absorption of microperforated duct systems[].HVAC R Research.2004
  • 2Fuchs H V,Zha X.Einsatz mikro-perforierter Platten als Schallabsorber mit inharenter Dampfung[].Acustica.1995
  • 3Wack R,Fuchs H V.On the use of micro-perforated sails in assembly rooms[].Joint Congress CFA/DAGA Strasbourg.
  • 4Fuchs H V,Zha X.Acrylic-glass sound absorbers in the plenum of the Deutscher Bundestag[].Applied Optics.1997
  • 5Fuchs H V.Alternative fibreless absorbers - New tools and materials for noise control and acoustic comfort[].Acustica.2001
  • 6Kang J,Fuchs H V.Predicting the absorption of open weave textiles and micro-perforated membranes backed by an air space[].Journal of Sound and Vibration.1999
  • 7MAA D Y.Theory and design of microperforated panel sound absorbing constructions[].Scientia Sinica.1975
  • 8Fuchs H V.Helmholtz resonators revisited[].Acustica.2000

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