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1、NAVALARCHITECTUREANDOCEANENGINEERING船舶與海洋工程2017年第33卷第2期(總第114期)DOI:10.14056/j.cnki.naoe.2017.02.001設(shè)計與研究薄膜型LNG船全船結(jié)構(gòu)屈服和疲勞強度分析王佳穎,金燕子,楊仁記,劉金峰(滬東中華造船(集團(tuán))有限公司,上海200129)摘要:以某薄膜型液化天然氣(LiquefiedNaturalGas,LNG)船的結(jié)構(gòu)設(shè)計為例,開展全船屈服強度校核和基于精細(xì)網(wǎng)格的有限元疲勞強度分析。針對5種典型裝載狀態(tài),基于美國船級社(AmericanBureauofShipping,ABS)全船強度直接計算指南,采
2、用ABS-DLA/SFA系列軟件,用三維波浪載荷預(yù)報程序?qū)Σɡ穗S機載荷進(jìn)行長期預(yù)報。基于預(yù)報結(jié)果,針對每種裝載狀態(tài)計算15個設(shè)計波參數(shù)組,求解全船結(jié)構(gòu)在各載荷組合工況下的應(yīng)力分布,繼而完成屈服強度校核。以甲板機械室與穹頂甲板相交處的關(guān)鍵節(jié)點區(qū)域的節(jié)點設(shè)計為例開展細(xì)網(wǎng)格局部強度分析,并通過各種改進(jìn)設(shè)計解決應(yīng)力集中問題。針對2種常用典型操作裝載狀態(tài)及營運于北大西洋海區(qū)疲勞壽命滿足40a的要求,基于ABS全船疲勞強度直接計算指南計算2個典型細(xì)化位置熱點應(yīng)力傳遞函數(shù),通過譜分析得到疲勞累積損傷和疲勞壽命,完成疲勞強度校核。采用的全船強度和疲勞分析方法和思路適用于其他超大型船舶的結(jié)構(gòu)分析。關(guān)鍵詞:大型
3、LNG船;全船有限元強度分析;細(xì)化網(wǎng)格;疲勞分析+中圖分類號:U661.43;U674.133文獻(xiàn)標(biāo)志碼:A文章編號:2095-4069(2017)02-0001-09AnalysisontheYieldStrengthandStructureFatigueofaMembraneLNGCarrierwithGlobalFiniteElementMethodWANGJia-ying,JINYan-zi,YANGRen-ji,LIUJin-feng(Hudong-ZhonghuaShipbuilding(Group)Co.,Ltd.,Shanghai200129,China)Abstract:T
4、heglobalyieldstrengthcheckandfatigueanalysisbasedonfiniteelementmethod(FEM)arecarriedoutwithrefinedmeshforthestructuraldesignofmembraneLNG(LiquefiedNaturalGas)carriersandthe3DwaveloadspredictioncodeofABS-DLA/SFAseriessoftwareisusedtoperformthelong-termpredictionoftherandomwaveloadsrespectivelyunder
5、fivetypicalloadingconditionsinaccordancewithABSglobalFEMdirectstrengthanalysisguide.Basedonthepredictionresult,15parametricgroupsofdesignwavesarecalculatedforeachloadingconditiontodeterminetheglobalstructurestressdistributionundereachloadcombination,andthustocompletetheyieldstrengthcheck.Thekeynode
6、regionofintersectionbetweendeckmachineryroomandtrunkdeckaretakenastheexampletoaccomplishthelocalstrengthanalysiswithfinemeshandseveraldesignimprovementsaremadetosolvetheproblemofstressconcentration.Accordingtothetwocommontypicaloperationalloadingconditionsandtheoperationalrequirementof40afatiguelif
7、eintheNorthAtlanticOcean,thehotspotstresstransferfunctionsoftwotypicalrefinedlocationsarecomputedbasedontheABSglobalFEMdirectstrengthanalysisguide.Thefatigueaccumulationdamageandfatiguelifeareobtainedthroug