轮胎噪声机理及减噪法v2

轮胎噪声机理及减噪法二〇〇九年六月廿九日1内容提要1.欧洲新法规2.轮胎噪声测试3.轮胎噪声机理4.如何减噪2内容提要1.欧洲新法规2.轮胎通过噪声测试3.轮胎噪声机理4.如何减噪3欧洲新法规：轮胎噪声标准TyreType轮胎宽-mmdB(A)C1A18570C1B185-21571C1C215-24571C1D245-27572C1E27574C2正常72驱动73C3正常73驱动75(时限)11/1/20124低滚动阻力：中等难度低车外通过噪声：高难度高湿地抓着：中等难度新标签系统将影响顾客购买轮胎的决定过程欧洲新法规刁难还是免费宣传？5LowNoiseMarkExternalrollingnoiseclasses(dB(A))C1C2C3LowNoiseMark*≤68≤69≤70PartCaForlownoisetyresdefinedaccordingtothegradingspecifiedbelow,thelabellingofthemeasuredexternalrollingnoisevaluemeasuredindBshallbecomplementedbythelownoisemark:6以克服欧洲新法规之挑战为契机的技术发展路线图轮胎厂家的回应应该及时改进轮胎性能，不但要合格，而且要以中间偏上为目标以此为契机，加强研发水平，制造并销售高性价比的轮胎，为提高利润，打好基础。目标滚动阻力和抗湿滑至少要达到C的水平或更好车外噪声要达到中等（●）或更好（●）技术达标期限2011年底以前实验轮胎各项技术指标合格2011年至2012年解决量产问题789101112201213201214内容提要1.欧洲新法规2.轮胎通过噪声测试3.轮胎噪声机理4.如何减噪15Attenuationvs.FrequencySoundintheWagonInteriorNoiseAttenuation:Structuralvs.Airborne车内噪声16RPMRoughroadsurfaceSmoothroadsurface胎腔共振效应花纹噪声车内噪声（右耳）17PitchSequencingforWhiteNoiseWhatiswhitenoise?Asoundwhosepowerspectrumdensityisessentiallyindependentoffrequency.Whitenoiseneednotberandomnoise.MLMSMLMSSMLMSSMMLSMLSMMLSM18dBFrequency-HzWhitenoiseBrownnoiseWhiteorBrown?19USPatent4,727,501(2/23/1988)UGTCMichelin20USPatent5,295,087(3/15/1994)Bridgestone21车外通过噪声Legalstandards1/3OctaveBand500Hz22ISO362,ISO13325TestSiteLeftmicrophoneRightmicrophone1.2mabovegroundTestsurfaceISO10844SoundPressureLevel=20log10(p/20)dB[p]=microPascals23ISO362Test–SystemReview(fromB&K)24~djo31/TyreNoise_roads.htmlHRA-BS594ISO-10844RoadSurfaceTexture:ISO10844andHotRolledAsphalt25室内轮胎通过噪声试验设备26内容提要1.欧洲新法规2.轮胎通过噪声测试3.轮胎噪声机理4.如何减噪27轮胎/路面噪声声源28轮胎噪声主要声源胎体振动与车速无关胎面花纹∝车行速度–气泵效应–风琴管共振胎腔共振与车速无关29转鼓轮胎噪声试验-光滑与粗糙面30轮胎噪声频谱瀑布图TreadpatternStructuralvibration光滑面粗糙面轮胎旋转频率-Hz3132轮胎振动模态分析试验Boltonetal,PurdueUniversity33RadialTreadBandVelocitySpectrumBoltonetal,PurdueUniversity34轮胎振动模态分析试验Michelin35模态分析-Michelin36近场声全息NAH(BoltonofPurdueUniversity)21mph37NAH低频胎体模态128Hz(BoltonofPurdueUniversity)38NAH低频胎体模态128Hz(BoltonofPurdueUniversity)39NAH低频胎体模态208Hz(BoltonofPurdueUniversity)40NAH中频胎体模态628Hz(BoltonofPurdueUniversity)41•2-DPhasedarrayofmicro-phones•AnalogoustoSAR•MoreefficientforhigherfrequenciesBeamingformingTechnique424344Driventirelouderatexitoffootprintcontactpatch45气泵效应与风琴管共振46474849FromSeminaronroadNoiseAbatement/DanishRoadInstituteTechnicalNote37,20065051*H.Sakai:TireEngineering,1986声音波型Pulse+Decayingsinusoid*SquarewavepulseSimplesqueezeAmplitudePGroovevolumePulsewidthDT=Groovewidth/SpeedPDTDTP52内容提要1.欧洲新法规2.轮胎通过噪声测试3.轮胎噪声机理4.如何减噪5354ContinentalTireCo.低噪声胎面花纹之设计55Tyre/RoadNoiseReferenceBookByUlfSandberg/JerzyA.EjsmontChapter7Tyre/RoadNoiseSourcesandGenerationMechanismsChapter10InfluenceonNoiseEmissionofVariousTyre-RelatedParameters5657MichelinX-OneTreadpatternforbetterwettractionandnoise58MichelinUSPatent6,484,773MichelinPatentWO02/060705Noisereductionthroughbleedingorrestrictingairinjection59+14+960+11+11+1361+13+12.362+14+96364谢谢大家！