基于优化思想的多成分系泊缆静力特性分析第32卷第10期2010年10月舰船科学技术SHIPSCIENCEANDTECHNOLOGYVo1.32,No.10Oct.,2010基于优化思想的多成分系泊缆静力特性分析张火明,张晓菲,杨建民(1.中国计量学院计量测试工程学院,浙江杭州310018;2.上海交通大学海洋工程国家重点实验室,上海200030)摘要:以一工作水深为320m的转塔式浮式生产存储系统(FPSO)为例,研究了多成分系泊缆索静力特性计算方法.基本思路是,首先基于一维优化思想(本文选取黄金分割法和悬链线方程方法)计算出每种类型锚泊线的水平张力一水平跨距曲线,以离散点的形式给出;然后依次给出上端系缆点水平移动距离,相应计算每根锚泊线新的水平跨距;再根据这些新的水平跨距在对应的一曲线中插值求出此时的每根锚泊线水平张力,将其向轴正方向投影,合成后即得上端系缆点移动后的系泊系统方向水平恢复力.对垂直方向的恢复力和单根缆索张力计算的方法与此类似.相应计算结果与Dynfloat软件结果吻合得很好.本文方法简单直观,容易理解,并且省时,通常完成1次计算所需时间小于1s,特别适合于需要多次迭代计算复杂系泊系统静力特性的等效水深截断系统优化设计.关键词:海洋平台;系泊系统;静力特性;悬链线方程;优化技术,:P75;TP309文献标识码:A:1672—7649(2010)10—01l4—08DoI:10.3404/j.issn.1672—7649.2010.10.029Staticcharacteristicanalysisofmulti-componentmooringlinebasedonoptimizationthinkingZHANGHuo—ming,ZHANGXiaofei,YANG激an—ming(1.CollegeofMetrologyTechnologyandEngineering,China激liangUniversity,Hangzhou310018,China;2.StatekeyLaboratoryofOceanEngineering,Shanghai激aotongUniversity,Shanghai200030,China)Abstract:Inthispaper,aturretmooredFPSOinwaterdepthof320misselectedtoinvestigatethecomputationmethodofstaticcharacteristicsofmulti—componentmooringline.Thebasicideacanbedescribedas~llows.Firstly,basedontheone—dimensionaloptimizationthinking,namelythegolden-sectionmethodinthispaper,andthecatenaryequationmethod,thecurveofhorizontaltensionTn—horizontalspanXofasinglemooringlineofeverytypeofcableiscalculatedandtheresultsareexpressedindiscretepoints.Secondly,thehorizontaltransferdistanceofthetoppointispresentedinturntocalculatethecorrespondingnewhorizontalspanofeverymooringline.Thirdly,throughnumericalinterpolationinthecorrespondingTH—Xcurveaccordingtothenewhorizontalspan,thehorizontaltensionofeverymooringlinecanbecalculated.Fourthly,toprojectTHatdirectionofandtointegrateitastotal,thehorizontalrestoringforceonthetoppointatdirectionXofthemooringsystemcanbeget.Thecalculationoftheverticalrestoringforceaswellasthetoppointtensionofsinglemooringlineissimilartothatmentionedabove.TheresultsarecomparedwiththosefromDynfloatandtheagreementisverygood.Themethodpresentedinthispaperissimpleandintuitive,easytounderstand,andveryshorttime—consuming.Usuallythetimerequiredtocompleteatimeofcalculationislessthan1second.Itcanbeconcludedthatthemethodinthispaperisparticularlysuitablefortheequivalentwater—depthtruncatedmooringsystemoptimizationdesignwhichrequiresmanyiterationsofcomputingthestaticcharacteristicsofcomplexmooringsystems.Keywords:oceanplatforms;mooringsystem;staticcharacteristics;catenaryequationmethod;optimizationtechnique收稿日期:2010—02—04;修回日期:2010—03—03基金项目:国家自然科学青年基金项目(10602055);国家863项目(2008AA09Z303)作者简介:张火明(1976一),男,博士,副教授,主要从事深海平台水动力学和智能优化算法在工程中应用研究.第10期张火明,等:基于优化思想的多成分系泊缆静力特性分析?115?言冀形式多样的新型海洋油气开采平台,包括浮式生产储油轮(FPSO),半潜式平台,张力腿式平台(TLP),单柱式平台(Spar)等,其海上定位通常都需要通过动力定位和锚泊系...