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1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
1 -  Advance in Design in Offshore Wind Turbines
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1 - Advance in Design in Offshore Wind Turbines

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Published on

ASCE Earth & Space 2010 OWT Symposium …

ASCE Earth & Space 2010 OWT Symposium

http://content.asce.org/files/pdf/EarthSpace2010Prelim-FINAL.pdf

http://ascelibrary.org/doi/book/10.1061/9780784410967

Published in: Design
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  • 1. Advanced Topics in Offshore Wind Turbines Design Franco Bontempi, Ph.D., P.E., Professor of Structural Analysis and Design School of Engineering University of Rome La Sapienza ITALY
  • 2. 2 6
  • 3. 3 INDEX OF TOPICS • Evolutive / Innovative Design • System Complexity 1) Structural Systems Decomposition 2) Enlarged Structural System (Actions Decomposition) 3) System Performance Decomposition
  • 4. 4 NEW KNOWLEDGE REQUIRED BY AN INNOVATIVE DESIGN ACTUAL KNOWLEDGE BASIS KNOWLEDGE REQUIRED BY AN EVOLUTIVE DESIGN Evolutive / Innovative Designs (1)
  • 5. 5 Evolutive / Innovative Designs (2)
  • 6. 6 STRUCTURAL SYSTEM
  • 7. 7 Wind / Wave Interaction DESIGN ENVIRONMENT MODELING
  • 8. 8 Soil / Structure Interaction GLOBAL STRUCTURAL MODELING
  • 9. 9 Global / Local Structural Aspects LOCAL STRUCTURAL MODELING
  • 10. 10 MACRO-LEVEL MESO-LEVEL MICRO-LEVEL DESIGN VARIABLES PERFORMANCE LEVELS MACRO-LEVELMESO-LEVELMICRO-LEVEL Structural System Decomposition
  • 11. 11 jacket: vertical element base: diagonal element base: horizontal element bucket – pile guide pile jacket: diagonal element jacket: horizontal element tower special junction zone Traditional Concepts
  • 12. 12 Scheme of strutted support structures for OWT positioned in sea with water level ranging from 20 to 35 m Innovative Concepts FLEXIBILITY OF CONFIGURATION
  • 13. 13 BASIC LOAD#1
  • 14. 14 BASIC LOAD#2
  • 15. MODEL
  • 16. MESH
  • 17. LOADS & RESTRAINTS
  • 18. SHELL MODEL
  • 19. 19 FRAME MODEL
  • 20. SHELL MODEL
  • 21. 21 ENVIRONMENT ZONE Structure Non environmental solicitations EXCHANGE ZONE Wind and wave flow Structural (non- environmental) system Site-specific environment Wind site basic parameters Other environmental agents Wave site basic parameters Wind, wave and sea current actions Aerodynamic and Aeroelastic phenomena Hydrodynamic phenomena Enlarged Structural System ENVIRONMENT ZONE EXCHANGE ZONE STRUCTURE
  • 22. 22 SYSTEM PERFORMANCE DEFINITION OF PRINCIPAL FUNCTIONS / GLOBAL PARTS DEFINITION OF INTERFACE VARIABLES / COMPONENTS DEFINITION OF DETAILED FUNCTIONS / LOCAL ELEMENTS
  • 23. 23 Performance decomposition STRUCTURAL SYSTEM PERFORMANCE INTRINSIC TO THE STRUCTURAL SYSTEM REFERRED TO SPECIFIC REQUIREMENTS i.e. LIMIT STATES DYNAMIC CHARACTERIZATION STRUCTURAL ROBUSTNESS SERVICEABILITY LIMIT STATES ACCIDENTAL / EXTREME LIMIT STATES ULTIMATE LIMIT STATES deformation limits connection decompression / slippage natural frequencies ... strength of the parts, elements, connections strength of the whole structure global / local stability ... survivability of the structural system in presence of extreme and/or unforeseen, situations compatibility of the intrinsic vibration characteristics of the structural system with those of the acting forces and loads and compatibility for the movement and the accelerations of the support system for the functionality of the turbine decrease in the load bearing capacity proportional to the damage
  • 24. 24 STRUCTURE Main structure Nacelle Rotor–nacelle assembly Operation Maintenance Emergency Support structure ACTIONS/LOADSENVIRONMENT Junctions/bearings Rotor Junctions/bearings Blades Junctions/bearings Tower Junctions Substructure Junctions Foundations Junctions Secondary structure Energy production Energy transfer Auxiliary structure Gravitational / Inertial Gravity Braking Aviation Seismic activity Aerodynamic Hydrodynamic Actuation Other Wave Current Torque control Mechanical breaking loads Yaw and pitch actuator loads Tsunami Impact loads Wake loads Wind conditions Marine conditions Seabed movement and scour Other conditions Normal wind conditions Extreme wind conditions Waves Sea currents Water level Marine growth Air temperature Humidity Solar radiation Rain, hail, snow, ice Chemically active substances Mechanically active substances Environmental aggressiveness Lighting Seismicity Water density Water temperature Maritime traffic Normal wave conditions Extreme wave conditions Serviceability Safety Reliability Robustness Service Limit States – SLS Ultimate Limit States – ULS_1 Accidental Limit States – ALSUltimate Limit States – ULS_2 Fatigue Limit States – FLS Deflections/Displacements Vibrations Strain limit Stress limit Degradation effects Buckling Fire Impact Explosion PERFORMANCE
  • 25. 25 Functional Analysis/ Resources Allocation - Decomposition to lower-level function - Allocate performance - Define functional interfaces - Define functional architecture Requirement loop Design loop PROCESS INPUT Historic Analyses Evolutive / Innovative Design Risk Management PROCESS OUTPUT Synthesis - Transform architecture - Define alternative product concepts - Define physical interfaces - Define alternative product and process solutions Requirements Analysis - Analyze missions and enviroments - Identify functional requirements - Define performance and design constraint requirement System Modeling And Analysis SYSTEM DESIGN
  • 26. 26
  • 27. 27 6

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