導(dǎo)管架型海洋平臺(tái)的疲勞可靠度及疲勞壽命研究.pdf

1、沈陽(yáng)建筑大學(xué)碩士學(xué)位論文導(dǎo)管架型海洋平臺(tái)的疲勞可靠度及疲勞壽命研究姓名：呂嘯斐申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：姜紹飛200801碩士研究生論文AbstractIIAbstractToaccuratelyevaluatelargescalestructurelikefatiguereliabilityofoffsheplatfmsfatiguelifereducetheanalyticalwkloadthisthesisisai

2、mingatprocessingtheuncertaintiesduringthefatiguereliabilitythefatiguelifefecastingprocesssuchasthecomplexityoftheplatfmenvironmentthehighburstinessromicitychangeabilityunderloadaswellascomplexhugerepeatedwkinthecalculati

3、onprocessofmechanicalanalysis.Therearesomeinvestigationsaredoneasfollowssothatwecansimplifythecomplexityofthelargescalestructurereducetheanalyticalefftsoffatiguereanalysissimultaneouslyimprovetheanalyticalprecisiontosome

4、extent.(1)TheplatfmisanalyzedbyANSYSAPDL:modeling－solving－postprocessing.Thisthesiscommencesonwaveenvironmentusesthedynamicanalysisspectrumanalysistoidentifythehotspot.Finallythefatiguereliabilityfoffsheplatfmsevaluation

5、isthroughtheanalyticalmethodwhichcombineswithapracticalexampleoftheprojectbasedonweibullprobabilitydistributionhypothesispowerspectrumdensityanalysismethod.(2)BasedontheSNcurvemodelMineraccumulationdamagetheytheoffshepla

6、tfmsiscutoffbysubstructuralmethod.Thenweanalyzethefatiguereliabilityofsubstructurefinallyassessthefatiguereliabilityoftheintegratedstructurecombinedbythefailureprocesslogicalrelationofeachsubstructure.Itisproposedthefati

7、guereliabilityofoffsheplatfmscalculationmethodbasedonsubstructure.(3)ThetrainingsamplesofBPwkarefromanalysisresultscalculatedbyANSYSBPwkisusedtoreanalyzeoffsheplatfmssoastofecastthefatiguereliabilitybyuseofBPwk.Thusthefa

8、tiguereliabilityofoffsheplatfmsanalyticalmethodbasedonBPwkisproposedacomparisonismadebetweenBPwkstep(2).Theresultsimplythatthismethodcaneffectivelyreducethecalculationtimetheresultsareingoodagreementwiththetheeticalresul

9、ts.(4)CombiningthePSNcurvewithBPneuralwkafatiguelifefecastingmethodbasedmultibranchBPneuralwkPSNcurveisproposed.Thefatiguelifeoftheexistingoffsheplatfmsunderdifferentfatigueloadingsreliabilityrequirementisfecastedacompar

10、isonismadebetweenthismethodrelatedspecificationstheresultshowsthattheyareinagoodagreement.Atthesametimethismethodcannotonlyconsiderintotheeffectofvariousfactsonthefatiguebehavibyawkmodelbutalsosimplifythecalculationproce