硕士论文-轻型客车橡胶悬置系统的优化设计研究

上海交通大学硕士学位论文轻型客车橡胶悬置系统的优化设计研究姓名：曾令贤申请学位级别：硕士专业：车辆工程指导教师：鲁统利;杨道华20051201IEQ6723LEQ6723ADAMSADAMSADAMSEQ6723LADAMS12,1.MATLABIIEQ6723L2.Pro/E5%3.ADAMSIIIOPTIMIZATIONDESIGNFORRUBBERMOUNTINGSYSTEMOFLIGHTBUSAbstractVibrationisolationoftheautomobile,especiallyvibrationisolationofpowertrainistheveryimportanttechniqueintheautomobileengineeringdesign.Vibrationhasaneffectonnotonlytheridecomfortableness,butalsoautomobile’sridestabilityandsafety.Mountsystemistheprimaryvibration-isolationcomponentbetweenpowertrainandbodyorframe.Themountpropertiesdeterminetheabilityofenergytransferbetweenpowertrainandbodyorframe.Therefore,thedevelopmentofpowertrainmountingsystemsisverynecessaryandsignificant.Thetopicofthisarticleiscombinedwithpractice,thecontentsisjustapartofonthedesignanddevelopmentofenginemountingoftheprojectonthedevelopmentofthelightbusEQ6723LinDONGFENGMOTORco.ltd,aswellasapartofthedevelopmentofhydraulicpowertrainmountingofEQ6723LbusinDONGFENGcommercialvehicleresearchanddevelopmentcenter.Thisarticlesummarizesthemainexperientialdesignmethodsonpowertrainmountingandthedevelopingcourseofmulti-bodysystemdynamicstheoryandthebasaltheoryofADAMSsoftware,themainmodelsandfeaturesofADAMSarealsointroduced.Awholemulti-bodymodelofthelightbusEQ6723Lisbuiltupwhichincludessimplyframe,suspension,tyre,etc.Theresultisobtainedabout6-freedomnaturalfrequencyandmodeofenginemountingsystemand12-freedommountingcushionvibrationisolationrateofthewholevehicleusingthemodel.Andthesimulationisconsistentwiththeresultofexperiment.Thentheanalyseofsimulationoptimizationisworked.Thereisanewandappliedmethodshownabouthowtoobtainthemassparametersofpowertraininthisarticle.Inordertogainthebesttransfercharacteristicsofpowertrainmountingsystem,aparametermodeofthemountingsystemisestablished.Thepositionofrubbermountsandthedynamicstiffnessaretargetedtobedesignvariablesandtheleasttransferforceischosentobeatargetofthemountingsystemdesign.Thereasonablearrangementofnaturalfrequencyofthemountingsystemischosetobeconstraintcondition.Theoptimizedsimulationismadeonthepowertrainmountingsystemandaperfectresultisobtained.KEYWORDS:powertrainmounting,vibrationisolation,ADAMS,simulation,optimizationVII1-1EQ6723L...................................................................5Fig.1-1EQ6723Llightbuswithindependentsuspension.......................................................52-1...................................................................................................9Fig.2-1Thefreedomvibrationwithdamping.......................................................................92-2..............................................................................................10Fig.2-2Theforcedvibrationwithdamping...........................................................................102-3.....................................................................................................11Fig.2-3Frequancyresponsecurve.......................................................................................112-4...............................................................15Fig.2-4Dimensionparametersdiagramofenginemountingsystemforcalculatingtheforce.......152-5..........................................................................................16Fig.2-5Theillustrationofstrikecentertheory......................................................................162-6............................................................................17Fig.2-6Theillustrationofenginebendmode.....................................................................17f2-7.............................................................18Fig.2-7Theliftingenginemounttypewithbushing............................................................182-8.......................................................................................19Fig.2-8Slopingrubbercushionmountingdiagram..............................................................192-9Nf..............................23Fig.2-9ThecurvediagramoftherelationshipofthemountingsystemnaturalvibrationfrequencyNfandthecushionstaticdeflectionä..........................................................................232-10...............................................................................................26Fig.2-10Cylindricrubber................................................................................................262-11............................................................................................272-12...............................................................................................27Fig.2-11Quatraterubber.................................................................................................27Fig.2-12Cylinderrubber.................................................................................................272-13.........................................................................................282-14.....................................................................................28Fig.2