汽車天空噪聲的控制和CFD仿真研究.pdf

1、合肥工業(yè)大學(xué)碩士學(xué)位論文汽車天空噪聲的控制和CFD仿真研究姓名：周益申請學(xué)位級別：碩士專業(yè)：機械電子工程指導(dǎo)教師：畢傳興201203ControlofAutomobileSunroofNoiseandCFDSimulationABSTRACTInrecentyears，asexhaust，engine，tire，drivetrains，andotherautomobilenoisearereduced，aerodynamicnoiseo

2、ngroundvehiclecruiseconditionisbecomingrelativelymoreimportant，beguntoattractwidespreadattentionThisstudywouldmainlyanalysishowtocontroltheaerodynamicnoiseofsunroofFirstlythenumericalmodelofcarbodyisestablishedandtheflow

3、fieldcalculationdomainsizeofcarbodyisdetermined，thenanumericalsimulationonsunroofflowfieldismade，andthree—dimensionalgridonbodysurfaceisgeneratedwhichwassuggestedtomeettherequirements，gridinkeyarea(nearsunroof)isfurtherm

4、eshedSOthatthesimulationcouldbemoreactualFlowfieldsimulationprocessiSdividedintosteadystatesimulationandtransientsimulationInthesteadystatesimulation，segregatedsolver，2ndOrderSIMPLE，2ndOrderUpwindandRNGk一占modelareusedfor

5、analyzingpressuredistributionandflowfieldcharacteristicsonsunroofwhichwouldbeprovidedreferencefortheinteriornoiseanalysisTheLargeeddysimulationthegridmodelofWALEareselectedintransientsimulation，meanwhile，theiteration2ord

6、ertimeprogressionwouldbespeedupthecalculationprocessForscientificprecision，thecentralfinitedifferencemodelofbetterconvergenceandgridadaptiveinspacewouldalsobeusedAndrelevantparametersuchasthetimestepisdeterminedbytheeddy

7、currentcyclenearsunrooftoensurethattherearemoresamplingpointsinanoffcycleoftheeddycurrent，astofullycapturethesunroofwindvibrationfrequencyInthesimulationanalysis，thefirst，numericalsimulationhasbeenworkedonautomobilesurfa

8、ceexteriorflowfieldatfirst，andthenthesunroofwindbuffetingnoisewasstudiedonthebasisAtlast，thecarmodelbuffetingfrequencyandthesoundpressuremonitoringpointswereobtainedInthisthesis，threekindofwaystocontrolsunroofnoisewasstu

9、died，whichareopeningsunroofscientifically，installcavityinthesunroofsforefrontandchangingthelocationofthesunroofintheroofTheresultsofsimulationshowthatthesemeasurementscaneffectivelyreducetheaeroacousticsofsunroofimprovet