大秦線載重80噸重載貨車整體心盤座結(jié)構(gòu)改進(jìn)及可靠性研究.pdf

1、北京交通大學(xué)碩士學(xué)位論文大秦線載重80噸重載貨車整體心盤座結(jié)構(gòu)改進(jìn)及可靠性研究姓名：于連友申請學(xué)位級別：碩士專業(yè)：車輛工程指導(dǎo)教師：李強20080601ABSTI認(rèn)CTThispaperpresentsastudyonthecrackoccurredontheintegralbodycenterplatefillerof80tcapacityC80aluminumalloyheavydutyfreightcal“andC80Bstain

2、lesssteelheavydutyfreightcarduringtheoperationonDaqinlineTakingtheoriginalstructureofthecrackedcarasthesubjectstudied，themethodsoffieldinvestigation，mathematicstatistics，theoryanalysisandtestinvestigationareappliedincomb

3、inationFiniteelementmethod，whichishighpracticalandwidelyappliedinengineeringarea，isappliedinnumericalsimulationanalysisThemethodofrealizingthenodedisplacementcouplebymasterslaverelationisproposedtosolvetheproblemofdiffic

4、ultyinsimulatingweldseaminfiniteelementcalculationAccordingtoSNcurvetestdatafortypicalweldjointspecifiedinFatigueDesignforNewFreightCars。ChapterVII，AARManualofStandardsandRecommendedPractices，theMinerlinearfatiguedamagec

5、umulationtheoryisappliedtoconductthefatiguelifeanalysisonthestructuresolvingthecomplexengineeringproblemofweldseamfatigueanalysisTherebythekeysupportingtechnologyisestablishedforanalyzingandinvestigatingthereasonsforearl

6、ycrackontheintegralbodycenterplatefillerof80tcapacityheavydutyfreightcarconstitutingthemodificationschemeandquicklyestimatingtheeffectivenessandtheoperationalreliabilityoftheschemeInordertoverifythecorrectnessofthetheory

7、analysis，thestaticstrengthtest，thedynamicstressmeasurementandtheindoorfatiguetestareconductedontheintegralbodycenterplatefillerstructureof80tcapacityheavydutyfreightCaroperatedonDaqinlineBytheoryanalysisandtest，itisprove

8、dthattheanalysisprincipleandmethodsappliedforreliabilityarecorrectandeffectiveItisconcludedthatthosethreefactorsofimproperdesignofweldseamstructure，stressconcentrationonweldendandtheincreaseoflongitudinalrepeatedfluctuat

9、ingloadin20，000theavycombinationtrainwhichcausetheearlycracksonintegralbodycenterplatefiller；thepracticalandfeasiblestructuremodificationschemefornewfreightcarandtheinspectionandrepairschemefortheexistingfreightcararepro

10、posedTheoperationsafetyoftheexistingcrackedcarbeforeinspectionandrepairisestimatedforprovidingthescientificreferenceforquicklysolvingtheproblemofcrackonintegralbodycenterplatefillerandthesubsequentstructuremodificationin