| Theoretical analysis on sound absorption by pseudostochastic diffusors |
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| 引用本文： | ZHAO Songling and SHENG Shengwo(Institute of Acoustics,Tongji University Shanghai 200092). Theoretical analysis on sound absorption by pseudostochastic diffusors[J]. 声学学报：英文版, 1996, 0(4) |
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| 作者姓名： | ZHAO Songling and SHENG Shengwo(Institute of Acoustics Tongji University Shanghai 200092) |
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| 作者单位： | Institute of Acoustics，Tongji University Shanghai 200092 |
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| 摘 要： | I.IntroductionIn1979,M.R.S.h.o.der[1]pro-posedanewdesignofsounddiffusorwhoseperiodcomprisesNelements(slotsorwells,referedtoaschannelsinfol1owing)ofequalwidths.ThedepthsofchanneIsvaryaccordingtoapseu-dostochasticsequencewithinonepe-riod.Atypicalstructureofq1ladraticresiduediffusor(N=11)isi1IustratedinFig.1.BychoosingthedePtl1ofchannels,thescatteringcharacteristicsofthestructurecanbeoptirnizeds11chastodistributethescattereden(}rgyequalIyoveralloweddirections.In1992,K.Fuiwaraandothers['repo…
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Theoretical analysis on sound absorptionby pseudostochastic diffusors |
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| ZHAO Songling and SHENG Shengwo. Theoretical analysis on sound absorptionby pseudostochastic diffusors[J]. Chinese Journal of Acoustics, 1996, 0(4) |
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| Authors: | ZHAO Songling and SHENG Shengwo |
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| Abstract: | In this paper,a new theory about sound absorption by pseudostochastic diffusors is proposed. A quantity, "coupling specific acoustic impedance" is defined for the coupling between adjacent wells of the structure. The variation of particle velocity and sound pressure in the vicinity of the opening of wells is investigated and the exact solution of lst approach is derived. Moreover, the nonlinear effect is discussed. The rigorous formula to calculate the nonlinear coupling specific acoustic impedance is derived. Typical calculation shows the nonlinear effect can apparently improve the sound absorption character of the structure even if the sound pressure level of incident wave is medial. |
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| Keywords: | Pseudostochastic diffusor Sound absorption Coupling intensity |
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