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1、StructuralSafety35(2012)63–71ContentslistsavailableatSciVerseScienceDirectStructuralSafetyjournalhomepage:www.elsevier.com/locate/strusafeStochasticanalysisofthein?uenceoftowershadowonfatiguelifeofwindturbinebladeR.R.Pedersen?,S.R.K.Nielsen,P.Thoft-ChristensenDep
2、artmentofCivilEngineering,AalborgUniversity,NielsBohrsVej8,6700Esbjerg,DenmarkarticleinfoabstractArticlehistory:Fatiguedamageaccumulationinupwindturbinebladesisprimarilyin?uencedbyturbulenceintheReceived23November2009in?ow.However,thestressreversalsduringbladepas
3、sagesthroughthestagnatingandde?ectedmeanReceivedinrevisedform8June2011wind?eldinfrontofthetoweralsocontributessigni?cantly.InthepaperthelowerorderstatisticalAccepted16December2011momentsofthefatiguelifeofabladeareestimatedandcomparedforaturbinewithatripodtowerAva
4、ilableonline12January2012andastandardmono-tower,respectively.Thestagnationzonesforeachofthelegsofthetripodarenar-rowerthanforthemono-tower,andhencethestressreversalswillbecomparablesmaller.ThebladeKeywords:stressesarecalculatedfromadynamicmechanicalmodelbasedonat
5、wodynamicdegreeoffreedom.WindturbinebladesTheself-inducedaero-elasticloadingandtheturbulenceloadingaremodeledbymeansofaquasi-staticStochasticfatiguedamageTowershadowmodellinearizedaroundtheoperationalpoint,ignoringanymemoryeffectsontheloadcoef?cients.TowerdesignH
6、owever,suchmemoryeffectsaretakenintoconsiderationatthecalculationoftheaero-dynamicloadMonteCarlosimulationduringtowerpassagebytheuseofarationalapproximationtotherelevantindicialfunction.BasedonMonteCarlosimulationsitisdemonstratedthattheexpecteddamageaccumulation
7、perunitoftimeintheturbinebladesarereducedsigni?cantlyforthetripodwhencomparedtothedamageinacompa-rablemono-towerdesign.ó2011ElsevierLtd.Allrightsreserved.1.Introductionin?uencedbythetowershadoweffect.MunduateandCoton[4]madewindtunnelexperimentswithatwo-bladeddown
8、-windtur-Towershadowisaero-dynamicdisturbancesofthewind?owbine,andconcludedthatthedelayofnon-stationarychangesoftheduetothepresenceofthetower.Thestressvariatio
