Stochastic analysis of the influence of tower shadow on fatigue life of wind turbine blade

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1、StructuralSafety35(2012)63–71ContentslistsavailableatSciVerseScienceDirectStructuralSafetyjournalhomepage:www.elsevier.com/locate/strusafeStochasticanalysisoftheinfluenceoftowershadowonfatiguelifeofwindturbinebladeR.R.Pedersen⇑,S.R.K.Nielsen,P.Thoft-ChristensenDep

2、artmentofCivilEngineering,AalborgUniversity,NielsBohrsVej8,6700Esbjerg,DenmarkarticleinfoabstractArticlehistory:FatiguedamageaccumulationinupwindturbinebladesisprimarilyinfluencedbyturbulenceintheReceived23November2009inflow.However,thestressreversalsduringbladepas

3、sagesthroughthestagnatinganddeflectedmeanReceivedinrevisedform8June2011windfieldinfrontofthetoweralsocontributessignificantly.InthepaperthelowerorderstatisticalAccepted16December2011momentsofthefatiguelifeofabladeareestimatedandcomparedforaturbinewithatripodtowerAva

4、ilableonline12January2012andastandardmono-tower,respectively.Thestagnationzonesforeachofthelegsofthetripodarenar-rowerthanforthemono-tower,andhencethestressreversalswillbecomparablesmaller.ThebladeKeywords:stressesarecalculatedfromadynamicmechanicalmodelbasedonat

5、wodynamicdegreeoffreedom.WindturbinebladesTheself-inducedaero-elasticloadingandtheturbulenceloadingaremodeledbymeansofaquasi-staticStochasticfatiguedamageTowershadowmodellinearizedaroundtheoperationalpoint,ignoringanymemoryeffectsontheloadcoefficients.TowerdesignH

6、owever,suchmemoryeffectsaretakenintoconsiderationatthecalculationoftheaero-dynamicloadMonteCarlosimulationduringtowerpassagebytheuseofarationalapproximationtotherelevantindicialfunction.BasedonMonteCarlosimulationsitisdemonstratedthattheexpecteddamageaccumulation

7、perunitoftimeintheturbinebladesarereducedsignificantlyforthetripodwhencomparedtothedamageinacompa-rablemono-towerdesign.Ó2011ElsevierLtd.Allrightsreserved.1.Introductioninfluencedbythetowershadoweffect.MunduateandCoton[4]madewindtunnelexperimentswithatwo-bladeddown

8、-windtur-Towershadowisaero-dynamicdisturbancesofthewindflowbine,andconcludedthatthedelayofnon-stationarychangesoftheduetothepresenceofthetower.Thestressvariatio