CENER CENTRO NACIONAL DE

ENERGÍAS RENOVABLES

NATIONAL RENEWABLEENERGY

CENTRE

BLADE DESIGN

• In-houseanalyticalapplications

combinedwithadvancedtoolsbased

onFEanalysis:optimizedandreliable

bladestructuredesigns

• Deepunderstandingofcomplex

failuremodes:delaminations,

debonding,fatigue…

• Fullcertificationassistance(GL,DNV…)

HUB & FRAME DESIGN

• Cast-manufacturerfriendlydesigns:collaborationwithproducers

(manufacturingrequirementsconsideredinthedesignphase)

• Fullcertificationassistance(GL,DNV…)

TOWER DESIGN

• Designandevaluationofboltedjoints

(VDI2230+FEM)

• Designandevaluationofweldedjoints

(InternationalInstituteofWelding+FEM)

• Residualstresses&geometrical

imperfectionscausedbythe

manufacturingprocessconsidered

inthedesign

• Fullcertificationassistance(GL,DNV…)

STRUCTURAL DESIGN

WINDENERGYDEPARTAMENT

CiudaddelaInnovación,731621Sarriguren(Navarra)·Spain

T+34948252800info@cener.com·www.cener.com

PuckCriterionmaxFailureIndexes

3DHubFEModel

Stressandgeometricalimperfectionsduetoweldingprocess

3DTowerFlangeConnectionFEModel

T-BoltVMStresses

CENER

FMAC (Fracture Mechanics Adhesive Calculation)

Toolemployedinthedetaileddesignphaseoftheblade’sbondedjoints,toreliablyevaluatetheirstrength(staticandfatigue).ItsformulationisbasedonFractureMechanicstheory(crackinitiation&growth).DirectI/OdatacommunicationwithaFEcode(NASTRANformat).

• Capabilitiesalreadydeveloped:VCCTtheoryimplemented(linear),firstcrackautomaticgeneration,crackpropagationassessmentanddirectionprediction.

• Capabilitiesindevelopment:userinterfaceimprovement,nonlinearfracturemechanicsintegration(cohesiveelements,non-linearsprings…),validationtestcampaignwithrepresentativecomponents.

CiudaddelaInnovación,731621Sarriguren(Navarra)·Spain

T+34948252800info@cener.com·www.cener.com

FATCOMP (Fatigue on Composites)

Apromisingtheorybasedonaninnovativeconnectionbetweenmicroandmacromechanicshasbeenidentified.ThescopeoftherunningR&Dprojectbasedonthisapproachincludesavalidationphase(withpotentialimprovements)ofthemethod,anintegrationstageofthisnewtheoryintothebladedesignloopbythedevelopmentofanin-housetool(FATCOMP)andafinalevaluationintermsofbladereliabilityandweight.

BASSF (Blade Analysis Stress Strain Failure) Toolusedintheblade’sinitialdesignphase,basedonanalyticalformulationssuchasEuler-Bernoulli&ClassicalLaminateTheory.Inputs:bladeaerofoils,materialplypropertiesandstaticandfatigueloads.Results:user-definedinternalarchitecture&laminatelay-uptowithstandtheloads.

• Capabilitiesalreadydeveloped:sectionalmechanicalproperties(includingcouplings),staticstrengthanalysis(compositefailuretheories)andfatigueanalysis(SN&CLDcurvesapproach).DirectI/OdatacommunicationwithGHBladed.

• Capabilitiesindevelopment:buckling,stochasticdesignbasedonthestatisticaldistributionofload&materialpropertiesanduserinterfaceimprovement.

UpwindI-BeamTesting FEModel

BASSFinterface

RESEARCH & DEVELOPMENT

Rotorbladesrepresentapproximatelyonequarterofthetotalwindturbinecost.Theyplayaparamountroleinkeyaspectssuchasturbineefficiencyandloadpropagation.Theuseofanalyticalandnumericaltechniquestriestopredictbladefailureconsideringideallaminateswithoutdefects,butaccountingforextremelyhighdesignfactors.But…,areourmodelsskill-enoughtoestimatelocalfailuresduetocomplexmechanisms?,havebladedesignersstrongconfidenceintheirdesigns?…Mainresearchtopicsarelistedbelow,focusingonthedevelopmentofadvanceddesigntechniqueswhichconsiderlocalandcomplexfailuremodes,challengingthelimitsofrotorbladecertification.

WINDENERGYDEPARTAMENT