轮轨冲击对构架疲劳的影响

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1、西南交通大学硕士学位论文轮轨冲击对构架疲劳的影响姓名：李华丽申请学位级别：硕士专业：车辆工程指导教师：肖守讷20081201西南交通大学硕士研究生学位论文第1I页AbstractDifferencebetweenrailtransportmodeandothermodesisthedynamicinteractionbetweenwheelandrail，whichupwardtransferstothelocomotiveanddownimposesonthetrackstructure，andthewheel—railcontactpointisrega

2、rdedasitsinterface．TodayrailtransportofChinaisinthefaceofmajordevelopment，itwillbringgreaterchallengestotherailtransport．Then，thefatigueissuesoflocomotiveandtrackstructurewhichareresultedfromtheinteractionwillbecomemoreprominentthaneverbefore．Inthispaper，basedontheresearchresultsof

3、thewheel．raildynamicinteractionandstructuralfatiguelifeprediction，thefatiguedamageofthelocomotivekeycomponents，whichareresultedfromthewheel．railimpact，willberesearchedanddiscussed．Basedonthelatestresearchresultsofwheel-railimpactathomeandabroad，thewheel．railimpactsystemwassimplifie

4、dasthreedegreesoffreedomsystemwithonlyverticalvibration，andthedifferentialequationWasestablished，theloadhistoriesofwheel．railimpactweresolvedbyRung-Kuttaformula．Secondly,thefiniteelementmodelofCo-Colocomotivewasestablishedconsistingofcarbody,bogieframeandwheelsets．Inordertovalidate

5、theveracityofthismodel，thestaticstressanalysisandmodeanalysisweredone．Thestresshistoriesoftheflamewereobtainedbytransientdynamicsanalysistechnology．Then，thedynamicstressesofthestructurewerecountedwiththerain—flowcountingmethodandtheaveragestressesweremodified．Finally,thestructuralf

6、atiguelifeofframeWaspredictedbasedonmaterialS．NcurveandlineardamagecumulativetheoryapplyingfatigueanalysissoftwarenSoft．Theresultsshowthatthefatiguelifeofframeisrathershortundertheeffectofwheel．railimpact，especiallysubjectedpulseinterferencefromthe西南交通大学硕十研究生学位论文第1II页wheel—railimpa

7、ct，thentheweldingpartsbetweenthefirstverticalabsorberblockandthesideframewillbedamagedeasily．Keywords：bogieframe；fatiguelife；transientdynamicsanalysis；wheel-railimpact西南交通大学凹南父逋大罕学位论文使用授权书本学位论文作者完全了解学校有关保留、使用学位论文的规定，同意学校保留并向国家有关部门或机构送交论文的复印件和电子版，允许论文被查阅和借阅。本人授权西南交通大学可以将本论文的全部或部分内容编

8、入有关数据库进行检索，可以采用影印、缩印或扫描等复制