基于试验与仿真分析的发动机运动件摩擦耦合动力学研究

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1、浙江大学机械与能源工程学院博士学位论文基于试验与仿真分析的发动机运动件摩擦耦合动力学研究姓名：林琼申请学位级别：博士专业：动力机械与工程指导教师：郝志勇20080901ABSTRACTWiththedevelopmentontheresearchofmodemenginenumericalsimulationtechnology,thecouplingbehavioroffrictioncharacteristicanddynamiccharacteristicinengineiscriedforsolving，whi

2、chisalsodemandedbytheresearchofengineNVHcontroltechnology．Thepioneeringstudyonthecouplingcharacteristicofengine’SfrictionbehavioranddynamicbehaviorWasperformedinthisthesis．Anintegratedenginenumericalvirtualprototypeincludingseveralfrictionalcharacteristicwasbuil

3、d．It’Scomprisedoffiniteelementmethod,non-linearfiniteelementmethodandmulti-bodydynamicmethodwasproposed，whichprovideareliabledata-basefortheoptimizationandevaluationofengine’Sdynamicsystem．First，thedissertationsystemicallyanalyzedallkindsofthefrictionphenomenoni

4、nengineandthendividedthemintotworesearchsystem：hydrodynamiclubricationfrictionsystemanddryfrictionsystem．AunitedsimulationtechnologyforthecouplingbehaviorofthehydrodynamiclubricationfrictionsystemandcrankshattsystemWaSproposed，whichintroducedtheEHDtheoryandfrict

5、iontheoryintomulti—bodysimulationtechnology．Bybuildingavirtualprototypeofafour-cylinderdieselengineforvehiclewhichcoupledwithacrankshaftsystemandthebearinghydrodynamiclubrication，themainbearingforce，theminimumthicknessoftheoilfilmanditsworkingcharacteristiccanbe

6、systematicallyobtained．Theobtainedsimulationresultindicatedthatthehydrodynamiclubricationfrictionbehaviorwillgreatlyaffectthesystemdynamiccharacteristicofengine．Tobuildamorereliableenginevirtualprototypeshouldconsiderthefrictionbehavior舔well嬲theprogressofthenume

7、ricalsimulationanddesign．Someoftheengine’Smovingpansalwayshavesomeinevitablefrictionphenomenonwhenit’SWasworking．Aimedatthesedryfrictionproblems，amethodonthetestresearchofthemetallicfrictionalcharacteristicWasproposed．Atest—bedofmetal’SdryfrictioncharacteristicW

8、asbuildtogainthehysteresiscurve，equivalentstiffnessanddamping．Thecomparebetweentestdataandtheorydataofhysteresiscurve，equivalentstiffnessanddampingwasmadetovalidateth