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：Themainintentionofthepresentstudyistoreducewind,wave,andseismicinducedvibrationsofjackettypeoffshorewindturbines(JOWTs)throughanewlydevelopedvibrationabsorber,calledtunedliquidcolumngasdamper(TLCGD).UsingaSimulink-basedmodel,ananalyticalmodelisdevelopedtosimulateglobalbehaviorofJOWTsunderdifferentdynamicexcitations.ThestudyisfollowedbyaparametricstudytoexploreefficiencyoftheTLCGDintermsofnacelleaccelerationreductionunderwind,wave,andearthquakeloads.StudyresultsindicatethatoptimumfrequencyoftheTLCGDisratherinsensitivetoexcitationtype.Inaddition,whilethegaininvibrationcontrolfromTLCGDswithhighermassratiosisgenerallymorepronounced,heavyTLCGDsaremoresensitivetotheirtunedfrequencysuchthatill-regulatedTLCGDwithhighmassratiocanleadtodestructiveresults.ItisrevealedthatawellregulatedTLCGDhasnoticeablecontributiontothedynamicresponseoftheJOWTunderanyexcitation.