| A numerical study of noise reduction in ducts with flow by anti-sound |
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| 引用本文： | ZHU Zhichi, HUANG Zhenhua and HE Zhen(Tsinghun University. Beijing 100084). A numerical study of noise reduction in ducts with flow by anti-sound[J]. 声学学报：英文版, 1994, 0(2) |
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| 作者姓名： | ZHU Zhichi HUANG Zhenhua and HE Zhen(Tsinghun University. Beijing 100084) |
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| 摘 要： | I.IntroductionAnti-soundisalsocal1edactivenoisecontro1(ANC).Itsbasicidea,presentedintheLueg'spatentinl936l'l,isthatthenoisereductionisobtainedbyuseofthesignalpro-cessingofthepreliminarysoundsource(i.e.noisesource)toformcoherenceinfluencebe-twccnthepreliminarysoundsourceandthesecondarysoundsourcc(i.c.anti-soundsource).Therearesomeadvantagesofanti-soundsuchasactivecontro1,lcsseffectonthecharacteristicsofnoisesourccandmorereductionoflowfrequcncynoisc.Inrecentyears,therewerealotoftheoreticalande…
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A numerical study of noise reduction in ducts with flow by anti-sound |
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| ZHU Zhichi, HUANG Zhenhua and HE Zhen. A numerical study of noise reduction in ducts with flow by anti-sound[J]. Chinese Journal of Acoustics, 1994, 0(2) |
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| Authors: | ZHU Zhichi HUANG Zhenhua HE Zhen |
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| Affiliation: | Tsinghun University. Beijing 100084 |
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| Abstract: | Using the measures adopted in fluid mechanics, a numerical method of noise reduction in duct with flow by anti-sound is established, in which a mathematical anti-sound model is deduced strictly. Several numerical examples are given in the cascs of backward and forward sound propagation to illustrate the influence of anti-sound on sound field in duct and to discuss the effects of intensity and phase angle of anti-sound sources, and the effect of flow velocity.It is shown that noise reduction by anti-sound does have a bright prospect in engineering applications. |
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| Keywords: | Active noise control Anti-sound Nonlinear acoustics Duct a coustics Numerical method |
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