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ID:16373116
大小:17.53 KB
页数:5页
时间:2018-08-09
《柔性连接杆的非线性动力学分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、Non-lineardynamicsofaflexibleconnectingrodAbstract:Thepresentstudyinvestigatesthedynamicresponseofsingle-cylinderreciprocatingengine.Inparticular,simplifiedmodelsoftheclassicalslider–crankmechanismareexamined,whichtakeintoaccounttheflexibilityoftheconnectingrod.Moreover,amainnewfeatu
2、reofthesemodelsisthatboththedrivingandtheresistingmomentsareexpressedasfunctionsofthecrankshaftmotion,insteadofprescribingtherotationofthecrank.TheequationsofmotionarefirstderivedbyapplicationofHamilton’sprinciple.Theseequationsarethendiscretizedgeometricallyandputintheirfinalformbya
3、pplyingGalerkin’smethod.Owingtothelargerotationsexhibitedbythemechanismmembersandtheformofthedrivingandtheresistingmoments,theresultingequationsofmotioninvolvestrongnon-linearities.Asaconsequence,theirsolutionisobtainedinboththetimeandthefrequencydomainbyemployingappropriatenumerical
4、methodologies.Inparticular,thesemethodologiesincludeeitherdeterminationoftransientresponsebyemployingdirectintegrationtechniquesordirectdeterminationofcompletebranchesofperiodicsteadystateresponsebyapplyingsuitablemethodologies.Thefirstsetofnumericalresultsreferstothespecialcasewhere
5、theangularvelocityoftheenginecrankcanbeconsideredasvirtuallyconstant.Thiscasecanbeanalysedmoreeasilyandprovidesvaluableinsightintosomeimportantaspectsofthesystemdynamics.Then,theemphasisisshiftedtothegeneralcase,correspondingtonon-idealforcingconditions.Inallcases,theattentionisfocus
6、edonexaminingtheinfluenceoftheparametersofthesystemonitsdynamicsduringintervalswithtransientorunderperiodicsteadystateconditions.Keywords:enginemechanisms,flexiblerod,non-idealforcing,periodicsteadystate,chaoticresponse,Sommerfeldphenomena1INTRODUCTIONDuringthelastthreedecades,therap
7、idandcontinuousimprovementsinthelevelofcomputingpowerhaveresultedinconsiderablebenefitsinmanytechnologicalfields.Theavailabilityofpowerfulcomputingmachinesandthedevelopmentofefficientnumericalcodeshavemadepossibletheanalysisoflarge-scalemechanicalmodels,includingthoseemployedintheare
8、aofenginedyn
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