简介：Aninnovativefloatingmooringsystemwithtwoormoreindependentfloatingmooringplatformsinthemiddleandonerigidplatformoneachsideisproposedforimprovingefficiencyandsafetyinshallowwater.Forthisnewsystem,mostofcollisionenergyisabsorbedthroughthedisplacementoffloatingplatforms.Inordertoillustratethevalidityofthesystem,aseriesofmodeltestswereconductedatascaleof1:40.Thecoupledmotioncharacteristicsofthefloatingmooringplatformswerediscussedunderregularandirregularwaves,andtheinfluencesofwavedirectionandothercharacteristicsondynamicresponseofthesystemwereanalyzed.Theresultsshowthatthemooringsystemissafestat0°ofwaveincidentangle,whereasthemostdangerousmooringstateoccursat90°ofwaveincidentangle.Motionresponsesincreasewiththeincreaseofwaveheight,butarenotlinearlyrelatedtochangesinwaveheight.

简介：—Analyticalandnumericalinvestigationismadeofthesourcepotentialforfloatingstructurewithforwardspeedinwaves.Aparticularformisselectedfornumericalapplications,wherethedoublein-tegraloftheGreenfunctionistransformedintothesingleoneandtheoscillationcharacteristicsforintegrandsinthespecificcomputationdomainaretreatednumerically.Acomparisonofcalculatedexam-p1eswithpublisheddataisgivenanditshowsthatthenumericalsimulationissatisfactoryandtheaccura-cyisadequatetoengineeringapplication.

简介：现在的学习理论上以及试验性地基于线性波浪理论调查在波浪和一连串的多孔的圆形的柱体之间的相互作用与或没有一个内部多孔的盘子。设计更有效的漂浮的防波提，通过数组宣传的波浪的传播率被评估。在数组的每柱体是部分用多孔的材料做的。明确地，它拥有多孔的sidewall和一个透不过的底部。另外，一个内部多孔的盘子水平地在柱体内被修理。它更有效地驱散波浪并且消除sloshing现象。当一个层次相互作用理论被采用在很多身体之中处理水动力学相互作用时，Kagemoto和Yue(1986)建议的途径被采用解决多重散布问题，它高效地节省计算时间。同时，有一连串的多孔的柱体的一系列模型测试在波浪盆被执行验证理论工作和计算结果。柱体，内部多孔的板的地点，和在邻近的柱体之间的间距的草稿也被适应在波浪驱散上调查他们的效果。

简介：Verticalaxiswindturbines（VAWTs）areadvantageousforthedevelopmentoflarge-scaleoffshorewindpowerbecausethedrivesystemislocatedatthebottomoftheturbine.Thisstudyinvestigatesthestructuralstrengthofatri-floaterfloatingfoundationsupportinga2.6MWDarrieusVAWT.Finiteelementmodelsofthefloatingfoundationweredevelopedusingspaceplate-beamelements.Theenvironmentalloads,suchastheaerodynamicloads,staticwindloads,andwave-currentloads,wereconsidered.Thegeneralstrengthsofthefloatingfoundationwerecalculatedforthenormaloperatingcase（acut-outwindspeedof25ms^（-1）andbladerotationof12rmin^（-1）wereusedtoanalyzethemostunfavorableloads）andanextremecase（windspeedof40ms^（-1）andparkedblades）,andtheweakcomponentsofthestructurewereanalyzed.Theresultsshowthatthefloatingfoundationmeetsthestrengthrequirementsandthestructuralstressishighestwhenthewave,wind,andcurrentareinacollineardirection.Themainandsecondarysupportingbarstransmittheloadsbetweenthestandcolumnsandthetowerfoundation,andtheirstressesarehigherthanthoseintheothercomponents.Intheactualdesign,thesesupportingbarsshouldbestrengthened.Theaerodynamicloadsareveryimportantandshouldbeconsideredinthestructuralstrengthanalysisofthefloatingfoundationandthefloatingwindturbinesystem.

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简介：在常规波浪的轮船漂浮状况是计算的。漂浮的轮船调节的新方程控制任何东西被向量操作的使用建议。这种形式是能与经常的系数用惩罚功能方法被解决的一个非线性的优化问题。并且解决的过程被两分加速。在解决的过程期间，轮船排水量和快活的中心被轮船表面的集成根据吃水线计算了。轮船表面用一个积聚的弦长度理论被描述以便决定排水量，快活中心和吃水线。在每个车站形成吃水线的风能被计算轮船表面和波浪表面的交叉发现。一个例子的结果显示这个方法准确、有效。漂浮能计算轮船在常规波浪调节以及简化计算并且改进计算效率和结果的精确。

简介：Inordertoaccountforrigid-flexiblecouplingeffectsoffloatingoffshorewindturbines,anonlinearrigid-flexiblecoupleddynamicmodelisproposedinthispaper.Theproposednonlinearcoupledmodeltakesthehigher-orderaxialdisplacementsintoaccount,whichareusuallyneglectedintheconventionallineardynamicmodel.Subsequently,investigationsonthedynamicdifferencesbetweentheproposednonlineardynamicmodelandthelinearoneareconducted.Theresultsdemonstratethatthestiffnessoftheturbinebladesintheproposednonlineardynamicmodelincreaseswithlargeroverallmotionsbutthatinthelineardynamicmodeldeclineswithlargeroverallmotions.Deformationofthebladesinthenonlineardynamicmodelismorereasonablethanthatinthelinearmodelaswell.Additionally,moredistinctcouplingeffectsareobservedintheproposednonlinearmodelthanthoseinthelinearmodel.Finally,itshowsthattheaerodynamicloads,thestructuralloadsandglobaldynamicresponsesoffloatingoffshorewindturbinesusingthenonlineardynamicmodelareslightlysmallerthanthoseusingthelineardynamicmodel.Insummary,comparedwiththeconventionallineardynamicmodel,theproposednonlinearcouplingdynamicmodelisahigher-orderdynamicmodelinconsiderationoftherigid-flexiblecouplingeffectsoffloatingoffshorewindturbines,andaccordmoreperfectlywiththeengineeringfacts.

简介：Asloshingmitigationconcepttakingadvantageoffloatinglayersofsolidfoamelementsisproposedinthepresentstudy.Physicalexperimentsarecarriedoutinaliquidtanktoinvestigatethehydrodynamicmechanismofthisconcept.Effectsofthefoam-layerthickness,excitationamplitude,andexcitationfrequencyonthesloshingpropertiesareanalyzedindetail.Itisfoundthatthefloatinglayersofsolidfoamelementsdonotevidentlyaffectthefundamentalnaturalsloshingfrequencyoftheliquidtankevidentlyamongtheconsideredcases.Attheresonantcondition,themaximumwaveheightanddynamicpressurearegreatlyreducedasthefoam-layerthicknessincreases.Higher-orderpressurecomponentsonthetanksidegraduallyvanishwiththeincreaseofthefoam-layerthickness.Caseswithdifferentexcitationamplitudesarealsoanalyzed.Thephenomenonisobservedwhenthewavebreakinginthetankcanbesuppressedbysolidfoamelements.

简介：Deep-waterregionsoftenhavewindsfavorableforoffshorewindturbines,andfloatingturbinescurrentlyshowthegreatestpotentialtoexploitsuchwinds.Thisworkestablishedproperscalinglawsformodeltests,whichwerethenimplementedintheconstructionofamodelwindturbinewithoptimallydesignedblades.Theaerodynamic,hydrodynamic,andelasticcharacteristicsoftheproposednewmulti-columntension-leg-typefloatingwindturbine(WindStarTLPsystem)wereexploredinthewavetanktestingofa1:50scalemodelattheStateKeyLaboratoryofOceanEngineeringatShanghaiJiaoTongUniversity.Testswereconductedunderconditionsofstillwater,whitenoisewaves,irregularwaves,andcombinedwind,wave,andcurrentloads.Theresultsestablishedthenaturalperiodsofthemotion,damping,motionresponseamplitudeoperators,andtendontensionsoftheWindStarTLPsystemunderdifferentenvironmentalconditions,andthuscouldserveasareferenceforfurtherresearch.

简介：Themovingparticlesemi-implicit(MPS)methodhasdemonstrateditsusefulnessinpracticalengineeringapplications.Althoughithaswideapplicability,itisstillhardtopredictthepressurepreciselyusingtheMPSmethod.Apressure-convectionparticlemethodbasedontheMPSmethodisproposedtoovercomethisproblem.Theimprovedperformanceofthisnewmethodisvalidatedwithcomputationalandmeasuredresults.Theapproachisalsoappliedtocomputetheproblemofsloshingassociatedwithfloatingbodymotioninwaves.Thepressure-convectionMPSmethoddemonstrateditscapabilitytoimprovethepredictionofpressure.

简介：Thispaperpresentsacoupleddynamicresponseanalysisofamulti-columntension-leg-typefloatingwindturbine(WindStarTLPsystem)undernormaloperationandparkedconditions.Wind-onlyloadcases,wave-onlyloadcasesandcombinedwindandwaveloadcaseswereanalyzedseparatelyfortheWindStarTLPsystemtoidentifythedominantexcitationloads.ComparisonsbetweenanNRELoffshore5-MWbaselinewindturbineinstalledonlandandtheWindStarTLPsystemwereperformed.Statisticsofselectedresponsevariablesinspecifieddesignloadcases(DLCs)wereobtainedandanalyzed.ItisfoundthattheproposedWindStarTLPsystemhassmalldynamicresponsestoenvironmentalloadsanditthushasalmostthesamemeangeneratorpoweroutputunderoperatingconditionsastheland-basedsystem.Thetensionmooringsystemhasasufficientsafetyfactor,andtheminimumtendontensionisalwayspositiveinallselectedDLCs.Theratioofultimateloadofthetowerbasefore-aftbendingmomentfortheWindStarTLPsystemversustheland-basedsystemcanbeashighas1.9inalloftheDLCsconsidered.TheseresultswillhelpelucidatethedynamiccharacteristicsoftheproposedWindStarTLPsystem,identifythedifferenceinloadeffectbetweenitandland-basedsystems,andthusmakerelevantmodificationstotheinitialdesignfortheWindStarTLPsystem.

简介：这份报纸地址关节风波浪导致了在正常状态和差错事件下面的近海的漂浮风汽轮机(OFWT)调节的一种半类型的动态回答。在这份报纸的分析及时被进行领域，用aero-hydro-servo-elastic模拟代码--快。由于唯一粘滞参考书系统的特征，实现在的原来的粘滞的抑制模型快被二次的代替获得精确俘获粘滞效果。模拟盒子在静止的水里包含免费腐烂的运动，面对常规波浪稳定运动并且象处于有或没有风的运作的海状态的动态反应一样弯屈。模拟也包括盒子因为快片在紧急情况以后投球导致的短暂回答关机。在许多刺激下面的站台运动，本地结构的负担和典型绳索行紧张力量的特征被获得并且调查。