A numerical study of noise reduction in ducts with flow by anti-sound |
| |
作者姓名: | ZHU Zhichi HUANG Zhenhua and HE Zhen |
| |
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…
|
A numerical study of noise reduction in ducts with flow by anti-sound |
| |
Authors: | ZHU Zhichi HUANG Zhenhua and HE Zhen |
| |
Institution: | Tsinghun University. Beijing 100084 |
| |
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. |
| |
Keywords: | Active noise control Anti-sound Nonlinear acoustics Duct a coustics Numerical method |
本文献已被 CNKI 等数据库收录! |