fatigue manager wind seminar
DESCRIPTION
DNV SESAM analysis procedure presentation for fatigue analysis of wind turbine generation foundationTRANSCRIPT
DNV GL © 2013
Offshore wind – combining DNV GL competencies
2
= +
40+ years of offshore oil
& gas experience
Global leader in risk
management of
offshore wind projects
DNV GL has 25 years
of hands-on experience
with wind turbines.
DNV GL Software
provides 40+ years of
offshore oil & gas
experience.
DNV GL © 2013
SesamTM – a 40 years success story
A complete system for strength assessment and sea-keeping analysis of ship and offshore structures
Used to design ships, offshore fixed and floating structures from shallow waters to ultra deep waters in harsh environments as well as structures supporting wind turbines
Covers the range from FEED to field abandonment and forms the basis for reanalysis systems in the operational phase
Documents a safe structure satisfying design standards, statutory regulations and criteria for HSE – covers the range from stress evaluations to code checking and fatigue of plates and beams
More than 170 organisations use Sesam as their preferred tool for structural engineering
GeniE for structural analysis
HydroD for hydrostatics and dynamics
DeepC for SURF, mooring and marine operations
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Sesam Wind Modules
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Fatigue Manager • FLS
Sesam Modules used:
• Wajac (hydrodynamics) • Sestra (solver)
• Splice (pile/soil)
• Framework (fatigue calculations)
GeniE • Modelling • ULS • Code-check
Sesam Modules used:
• Wajac (hydrodynamics) • Sestra (solver)
• Splice (pile/soil)
DNV GL © 2013
Sesam for other offshore wind related structural analysis
Design and analysis of
installation vessels
Transportation analysis
– Seakeeping and hydrodynamics
– Hydrostatics and stability
Installation analysis
– Lifting operations
– Through surface effects
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What can Sesam do for Offshore Wind Turbine Installations?
Design of substructures according to IEC61400-3 /DNV-OS-J101
Modelling
– Full 3D modelling environment for frame and shell models
– Consider complex transition structure between the wind tower and the supporting structure
Non-linear structural dynamics of fully integrated system
– Coupled analysis with Wind Turbine
– FE-representation of component
– Pile/Soil
– Wave-structure interaction
Structural assessment
– Eigenvalue analysis
– Calculation of beam forces and stresses
– Fatigue calculations
– Integrated code-check supporting NORSOK,API, AISC, Eurocode, ISO, DS
Floating Offshore Wind Turbine
– Simulate offshore wind turbines mounted on arbitrary floaters
– Interaction effects between - and dynamic responses of - all components
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Fatigue Manager (Uncoupled)
Time series of loads
at interface point.
Converters from:
– Bladed
– HAWC
.wind format
– Simple text file.
– time Fx Fy Fz Mx My
Mz
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Jacket, tripod and monopile
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1. Modelling and wave
load calculation Sesam GeniE
2. Wind turbine
design analysis (Bladed, HAWC,
FLEX, …)
3. Substructure and
foundation analysis - FLS Sesam Wind
- ULS Sesam GeniE
Load calculations Wind turbine design Substructure design
Load time
series Properties
Loads
DNV GL © 2013
Sesam Wind - Fatigue Manager imports Bladed Results
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Bladed
.$25 files with
Beam Forces and Moments
Fatigue
Manager Bladed Converter
_R1.SIN files
with structure and results
Use in Fatigue
Manager for FLS
or in GeniE for
Code-check
DNV GL © 2013
Fatigue
Methodology according to DNV-OS-J101 and DNV-
RP-C203
– Time-series simulation of wind/wave load
combinations
– Fatigue calculations by rainflow counting
– Pre-defined or user defined S-N curves and SCFs
Combined fatigue damage from all wind speed and
sea states
– Multiple wind speeds and sea states
– Multiple wind and wave headings
– Aligned and unaligned wind and sea
Printable report for overall results
Support for beam structures,…
– Circumferential and axial welds
– Tubular joints
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Fatigue Manager and Sesam Cloud
Faster
More complex structures
More load combinations
More design iterations
CPU capacity on demand
Data storage on demand
Data security
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Ultimate Strength and Code Check
Code check of beams and joints
according to international standards
– Eurocode
– NORSOK
– AISC
– API
Wind and Wave load combination by
– Characteristic loads
or
– Time series simulation
Graphical result presentation
Reporting
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Gravity based substructure
Base shear and overturning moment
from time series simulation of wave
loads and imported wind loads
Modelling
– Full 3D modelling environment for frame
and shell models
Loads
– Wave and current loads for slender and
large volume structures
– Random sea states and non-linear wave
– Hydrostatic and Froude-Krylov pressure
on exact wetted surface
– Import of wind loads (time series) from
wind turbine programs
Structural analysis
– Load transfer to structural model
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Sima for floating foundation and marine operations
Sima
– Coupled analysis of floating wind turbines
– Simulate OWT mounted on arbitrary
floaters
– Interaction effects between - and dynamic
responses of all components
–Dynamic equilibrium at each time step
ensured by direct nonlinear time domain
integration scheme
–Wave load and motion analysis
– Structural analysis
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SIMA/RIFLEX – model for floating wind turbine
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Non-linear FE-model of entire system:
• Floater: hydrodynamic loads (1st and 2nd order potential wave forces, viscous drag)
• Mooring lines: hydrodynamic loads (generalized Morison load model)
• Tower: wind loads
• All the components: inertia forces, weight and buoyancy.
• Blades: Aerodynamic loads. BEM method (with dynamic inflow) on each element.
• Tower upwind effect on wind field by potential theory approach
• Control system: Blade pitch and electrical torque control algorithms