半潜式钻井平台简化模型的疲劳可靠性谱分析

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1、上海交通大学硕士学位论文半潜式钻井平台简化模型的疲劳可靠性谱分析姓名：田其磊申请学位级别：硕士专业：固体力学指导教师：王熙20090201上海交通大学硕士学位论文摘要于1。本文所呈现的主要研究内容和结果可为深水半潜式钻井平台工程设计提供一定的理论参考依据和实际应用价值。关键词：半潜式钻井平台，波浪力谱，全概率谱分析方法，随机响应分析，疲劳可靠性。第II页上海交通大学硕士学位论文ABSTRACTASTUDYONFATIGUERELIABILITYOFSIMPLIFIEDMODELOFSEMI-SUBMERSIBLEDRILLIN

2、GPLATFORMABSTRACTInthispaper,fatiguereliabilityofdeepwatersemi-submersibledrillingplatformisstudiedonthebasisofinvestigationsoffatiguereliabilitystudyindrillingplatformstructure.Themainresearchcontentandconclusionisasfollows:Establishingsimplifiedmodelofsemi-submers

3、ibledrillingplatformforspectralanalysisbasedontheprincipalofequivalentmomentofinertiaandequalweight.DeterminingthewaveforcespectrumbasedontheMorisonequationandwaveforceformulaforthelargeverticalcylinder.DeterminingVon-Misesequivalentstressstochasticresponsespectralp

4、owerdensityofkeynodesinthesemi-submersibledrillingplatformbymeansofANSYSsoftwareonthebasisofthefull-probabilityspectrum-basedmethod.DeterminingthefatiguereliabilityindexofkeynodesintheplatformkeystructureaccordingtoMinerlinearcumulativedamagetheoryandprincipaloffirs

5、t-timedestructionofstochasticresponseprobabilityanalysis.Accordingtotheresults,distributionbetweenMorisonwaveforcespectrumandwaveforcespectrumoflargeverticalcylinderaredifferent,andthedifferenceofthepeakisnotable.ThedistributionofVon-Misesequivalentstressstochasticr

6、esponsespectralpowerdensityofkeynodesinthesemi-submersibledrillingplatformisdifferentunderdifferentwaveanglesanddifferentwaveforcespectrums.ThepeakofVon-Misesequivalentstressstochasticresponsespectralpowerdensityarepartlycausedbytheresonanceofstructure,andpartlycaus

7、edbythepeakofwaveforcespectrum.Thefatiguereliabilityindexesofkeynodesintheplatformkeystructurearemostlylargerthan3,whichmeansthesafetyprobabilityoftheplatformstructureisadjacentto1.Themainresearchcontentandconclusioninthispapercouldprovideengineeringdesignofthesemi-

8、submersibledrillingplatformwithreference第III页上海交通大学硕士学位论文ABSTRACTofthetheoreticalbasisandpracticalapplicationreference.Keywords:semi-subme