港機結構失效診斷、控制和維修方法研究及應用.pdf

1、同濟大學機械工程學院碩士學位論文港機結構失效診斷、控制和維修方法研究及應用姓名：商偉軍申請學位級別：碩士專業(yè)：機械工程指導教師：盧耀祖張振雄20030911AbstractResearchesonfailure(egcracks，buckling，etc)detectionfailurecontrolandmaintenanceformetalstructureofportalmachine(PM)areveryimportantnot

2、onlyforevaluatingtheoperationalstatusofstructureofPM，butaiSOfordesigningandmaintainingsuchmachines乃eseresearchesCanalsopromotePMmanufacturerstenovatetraditionaldesignmethodsorteformmaintenaneesystemofPMThefailureofPMmeta

3、lstructurehaswidelypuzzledpeoplewhoworkinthisfieldforalongtimeItisstiUadifficultproblemtOdiagnose，controlandrepairaPMstructurewithfaultsTodiagnoseistopredictortodecidetherightlocationsonthestructurewithhiddenfaults；andto

4、controliStopredictthedevelopmentofexistedfaultsunderpresentloadsduringaperiodoftime，includingtheharmtothestructurebysuchfaults；tepairistoremovefaultsonthestructureandtestoreitsnormalloadcarryingabilityBasedontheoriesoffr

5、acturemechanics，elasticmechanicsandcomputerscience，techniquesforfailurepreventing，failurecontrollingandmaintenanceofPMstructures也atCanbeappliedtoengineeringpracticearediscussedinthisthesis1accordingtothepropertiesofcrack

6、sonPMstructure，certain也eoriesoffracturemechanicsandfatigueanalysisareappliedtofindaguidelineforforecastingPMmetalstructure’SfatiguecrackstheirallowablestressandcriticalcracksThesewillbeformedastlleoreticalbasisfordetermi

7、nationofinspectinglocationsonPMmetalstructureandofinspectingcycles；2州thshell’SstabilitytheorythebucklingofantypicalPMstructure，ie，thethinwalledboxsectionmemberisdiscussedwhichincluderelatedfactorssuchasinitialcurvature，e

8、lasticmodulus，residualweldingstressaswellassupportingeonditionsetcMarguerr’slargedeflectiontheoryisusedtobuilduprelationsbetweengeometricdefectandprebucklingloadcarryingcapacityofthinwailedboxsectionstructureResearchessh

9、owthatthepartofPMthatbucklingfrequentlyoccursistheboomofportalcrane；3theinfluenceofweldingonstructureisalsodiscussedItiSbelievedthatduetoresidualweldingstress’Sinfluenceonstaticstrength，fatiguestrengthandstabilityofstruc

10、turethestresscausedbyloadissuperimposedbytheresidualstressⅥmenthetotalcompressstressexceedsitsthreshold10calbucklingwillOCCuronthethinwalledplateTheplateCannolongerbearfurtherloadwhichfinallycausestheoverallbucklingofent

11、irestructure4。toimprove(oreliminate)stressconcentrationattipofcrackandtOimproveweldingtechnologytheoryandmethodsoncrackpatchingareanalyzedindetailRecommendedpatchingmethodshavecertainadvantagesandarereliableinpractice5th

12、econceptofmaintenancemarxisusedtocompareandtoevaluatetheeffectivenessofdifferentcrackpatchingmethods，whichCanbeusedasimportantguideforeffectivepatchingFinallythe2000typelightweightquaysidecontainercraneisusedasanexampleA