CENER CENTRO NACIONAL DE ENERGÍAS RENOVABLES …cener.com/documentacion/CENER_Structural...
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CENER CENTRO NACIONAL DE ENERGÍAS RENOVABLES NATIONAL RENEWABLE ENERGY CENTRE BLADE DESIGN • In-house analytical applications combined with advanced tools based on FE analysis: optimized and reliable blade structure designs • Deep understanding of complex failure modes: delaminations, debonding, fatigue… • Full certification assistance (GL, DNV…) HUB & FRAME DESIGN • Cast-manufacturer friendly designs: collaboration with producers (manufacturing requirements considered in the design phase) • Full certification assistance (GL, DNV…) TOWER DESIGN • Design and evaluation of bolted joints (VDI 2230 + FEM) • Design and evaluation of welded joints (International Institute of Welding + FEM) • Residual stresses & geometrical imperfections caused by the manufacturing process considered in the design • Full certification assistance (GL, DNV…) STRUCTURAL DESIGN WIND ENERGY DEPARTAMENT Ciudad de la Innovación, 7 31621 Sarriguren (Navarra) · Spain T + 34 948 25 28 00 [email protected] · www.cener.com Puck Criterion max Failure Indexes 3D Hub FE Model Stress and geometrical imperfections due to welding process 3D Tower Flange Connection FE Model T-Bolt VM Stresses
Transcript of CENER CENTRO NACIONAL DE ENERGÍAS RENOVABLES …cener.com/documentacion/CENER_Structural...
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
[email protected]·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
[email protected]·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
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