风噪声对车内影响-网络研讨会

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1、ACTRANforCarSideWindowsNoise李奇博士FreeFieldTechnologies1998，由Jean-PierreCoyette教授、Jean-LouisMigeot教授创立1999-2001，雷诺,标志,菲亚特,通用汽车,空中客车,壳牌石油,德国Lloyd船级社等十一家大型企业，共同资助FFT开发ACTRAN软件专业的声学仿真工具（Actran/Acoustics）:振动声学(Actran/VibroAcoustics,ActranforNastran)流动声学(Actran/TM,Actran/DGM,Actran/AeroAcou

2、stics)前后处理器(Actran/VI)2ACTRAN技术团队与支持培训与教学研讨会软件培训专题培训请关注http://www.caetraining.com.cn技术支持ACTRANQQ技术群：81289983ACTRAN资料库：ftp://ACTRAN:ACTRAN@211.157.108.87:203ACTRANModulesACTRANforNASTRANACTRANDGMACTRANVibroAcousticsACTRANAeroAcousticsACTRANTMACTRANAcousticsACTRANVI4Noiseinacarindu

3、cedbythesidemirrorPhysicsThesidemirrorshedsturbulenteddiesinitswakeTheturbulencecreatesaWallPressureFluctuationonthewindowTheWPFcauseavibrationofthevisco-elasticstructureofthewindowThisvibrationinducesnoiseinthecarModelinginActranAsidewindowcanbemodeledbyavisco-elasticshellItsseal

4、canbemodeledbyavisco-elasticmaterialTheseats,carpets,dashboardetccanbemodeledusingtheBiotmodeland/oradmittanceTheWallPressurefluctuationsareimportedfromaCFDcode(LES)5NoiseduetoaSide-mirror(1/2)Twomainphenomenaoccur,botharecausedbytheturbulence,thetruenoiseisthesumofboth1.Theturbulencei

5、s,itself,asourceofnoiseThevortexstructuressheddownstreamthesidemirroraresourcesofnoiseThenoiseisinfluencedbythepresenceofthesidewindow(AWPF)1aThenoiseispartiallytransmittedthroughthesidewindow1b1a1bTurbulencesintoOpenFOAMACTRANAero-AcousticsACTRANVibroAcousticsVortexstructuresshedTurbu

6、lencenoise(fromtheNoisetransmissionthroughdownstreamthesidemirrorvortexstructures)outsidethethewindowgeneratesturbulencescaronly6NoiseduetoaSide-mirror(2/2)2.Theturbulencealsoinducesaturbulentpressurefluctuationatthewalls(TWPF)ThisTWPFcausesavibrationofthevisco-elasticstructureofthesidew

7、indowThesetwophenomenacanbestudiedinACTRANandinvolvestwodifferentmodelingstrategiesIncompressiblePressurefluctuationsarestoredonthissurfaceCFDSolverAcousticWPFNoiseduetothe1volumeAWPFcreatedbythevortexsourcestructuresStrategy1ACTRANacousticradiation2NoiseduetotheTW