Advanced Topics in Offshore Wind Turbine Research

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In the today world context of strong attention about energy resources and global sustainability,
Offshore Wind Turbines (OWT) reached a main consensus about effectiveness. The Symposium is
concerned about all the features related with these complex challenging structural systems, covering
both design aspects and analysis problems, with special attention on interaction mechanisms and
multidisciplinary studies, with demanding technological characteristics and experimental activities.

Published in: Design, Technology, Business
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Advanced Topics in Offshore Wind Turbine Research

  1. 1. Advanced Topics inOffshore Wind Turbines DesignFranco Bontempi, Ph.D., P.E.,Professor of Structural Analysis and DesignSchool of EngineeringUniversity of Rome La SapienzaITALY
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  3. 3. 3INDEX OF TOPICS• Evolutive / Innovative Design• System Complexity1) Structural Systems Decomposition2) Enlarged Structural System(Actions Decomposition)3) System Performance Decomposition
  4. 4. 4NEW KNOWLEDGEREQUIRED BYAN INNOVATIVEDESIGNACTUALKNOWLEDGEBASIS KNOWLEDGEREQUIREDBY AN EVOLUTIVEDESIGNEvolutive / Innovative Designs (1)
  5. 5. 5Evolutive / Innovative Designs (2)
  6. 6. 6STRUCTURAL SYSTEM
  7. 7. 7Wind / Wave InteractionDESIGN ENVIRONMENTMODELING
  8. 8. 8Soil / Structure InteractionGLOBALSTRUCTURALMODELING
  9. 9. 9Global / Local Structural AspectsLOCALSTRUCTURALMODELING
  10. 10. 10MACRO-LEVEL MESO-LEVEL MICRO-LEVELDESIGNVARIABLESPERFORMANCELEVELSMACRO-LEVELMESO-LEVELMICRO-LEVELStructural System Decomposition
  11. 11. 11jacket:vertical elementbase:diagonal elementbase:horizontal elementbucket – pile guidepilejacket:diagonal elementjacket:horizontal elementtowerspecial junctionzoneTraditional Concepts
  12. 12. 12Scheme of struttedsupport structures forOWT positioned in seawith water level rangingfrom 20 to 35 mInnovative ConceptsFLEXIBILITY OF CONFIGURATION
  13. 13. 13BASICLOAD#1
  14. 14. 14BASICLOAD#2
  15. 15. MODEL
  16. 16. MESH
  17. 17. LOADS &RESTRAINTS
  18. 18. SHELLMODEL
  19. 19. 19FRAMEMODEL
  20. 20. SHELLMODEL
  21. 21. 21ENVIRONMENT ZONEStructureNonenvironmentalsolicitationsEXCHANGE ZONEWind and wave flowStructural (non-environmental)systemSite-specificenvironmentWind site basicparametersOtherenvironmentalagentsWave site basicparametersWind, wave andsea currentactionsAerodynamic andAeroelasticphenomenaHydrodynamicphenomenaEnlarged Structural SystemENVIRONMENTZONEEXCHANGEZONESTRUCTURE
  22. 22. 22SYSTEM PERFORMANCEDEFINITION OFPRINCIPAL FUNCTIONS /GLOBAL PARTSDEFINITION OFINTERFACE VARIABLES /COMPONENTSDEFINITION OFDETAILED FUNCTIONS /LOCAL ELEMENTS
  23. 23. 23Performance decompositionSTRUCTURALSYSTEMPERFORMANCEINTRINSICTO THESTRUCTURALSYSTEMREFERREDTO SPECIFICREQUIREMENTSi.e. LIMIT STATESDYNAMICCHARACTERIZATIONSTRUCTURALROBUSTNESSSERVICEABILITYLIMIT STATESACCIDENTAL /EXTREMELIMIT STATESULTIMATELIMIT STATESdeformation limitsconnection decompression / slippagenatural frequencies...strength of the parts, elements, connectionsstrength of the whole structureglobal / local stability...survivability of thestructural system inpresence of extreme and/orunforeseen, situationscompatibility of the intrinsic vibrationcharacteristics of the structural system with those ofthe acting forces and loads andcompatibility for the movement and the accelerationsof the support system for the functionality of theturbinedecrease in the load bearing capacity proportionalto the damage
  24. 24. 24STRUCTUREMain structureNacelleRotor–nacelle assemblyOperationMaintenanceEmergencySupport structureACTIONS/LOADSENVIRONMENTJunctions/bearingsRotorJunctions/bearingsBladesJunctions/bearingsTowerJunctionsSubstructureJunctionsFoundationsJunctionsSecondary structureEnergy productionEnergy transferAuxiliary structureGravitational / InertialGravityBrakingAviationSeismic activityAerodynamicHydrodynamicActuationOtherWaveCurrentTorque controlMechanical breaking loadsYaw and pitch actuator loadsTsunamiImpact loadsWake loadsWind conditionsMarine conditionsSeabed movement and scourOther conditionsNormal wind conditionsExtreme wind conditionsWavesSea currentsWater levelMarine growthAir temperatureHumiditySolar radiationRain, hail, snow, iceChemically active substancesMechanically active substancesEnvironmental aggressivenessLightingSeismicityWater densityWater temperatureMaritime trafficNormal wave conditionsExtreme wave conditionsServiceability Safety Reliability RobustnessService Limit States – SLS Ultimate Limit States – ULS_1 Accidental Limit States – ALSUltimate Limit States – ULS_2Fatigue Limit States – FLSDeflections/DisplacementsVibrations Strain limitStress limit Degradation effectsBuckling FireImpactExplosionPERFORMANCE
  25. 25. 25Functional Analysis/Resources Allocation- Decomposition to lower-level function- Allocate performance- Define functional interfaces- Define functional architectureRequirementloopDesign loopPROCESSINPUTHistoric AnalysesEvolutive / InnovativeDesignRisk ManagementPROCESSOUTPUTSynthesis- Transform architecture- Define alternative product concepts- Define physical interfaces- Define alternative productand process solutionsRequirements Analysis- Analyze missions and enviroments- Identify functional requirements- Define performance and designconstraint requirementSystemModelingAndAnalysisSYSTEM DESIGN
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