Secure Documents Subtask 2 Research for Deeper Waters

Waves-1

The above file contains:

IrregAiry_kinematics.txt
IrregAiry_surface.txt
ReadMe.pdf
RegAiry_format.xls
RegAiry_kinematics.txt
RegAiry_surface.txt
RegSF_kinematics.txt
RegSF_surface.txt

Monopile Foundation

Memorandum Derivation and Description of the Soil-Pile-Interaction Models
Analysis of Individual Piles and Drilled Shafts Subjected to Lateral Loading
Soil Pile Interaction Model
Soil-Pile-Interaction Models Read Me
Coupled Springs Matrices

Tripod Support Structure

45m tripod
Tower Definition NEW

Floating System

Conference Papers and Journal Articles

New Presentation (5-18-2010) Offshore Code Comparison Collaboration within IEA Wind Task 23:
Phase IV Results Regarding Floating Wind Turbine Modeling
Jonkman

Gigawind5 OC3 Passon_Kuehn
Science of Making Torque from Wind Paper - OC3 Overview and Phase I Results
2007 European Offshore Wind Conference - OC3 Phase II Results
2009 AIAA Aerospace Sciences Meeting - OC3 Phase III Results

Background Scope Approach/Phases Collaboration

SUBTASK 2
OFFSHORE WIND – TECHNICAL RESEARCH FOR DEEPER WATER (> 30m)
All of the significant experience with offshore wind turbine foundations and support structures has been with either monopiles or gravity based foundations in water depths less than 30-metres. Some member countries are interested in alternative technology applications that will allow turbines to be placed in water depths greater than 30 m because they do not have abundant sites with shallow water (e.g. Japan, Italy, Spain, Ireland, Portugal, UK, and the USA), and some countries may be interested in deeper sites to mitigate potential visual impacts from the coastlines. To successfully deploy wind turbines in these depths, alternative fixed-bottom support structures or floating platforms may be necessary.

There is no significant offshore wind industry experience with floating platforms yet. The oil and gas industries, however, have deployed thousands of floating oil-drilling platforms in depths up to 2-kilometers. Drawing from this experience, the wind industry can develop floating platforms by building on these offshore technologies but the costs must be reduced substantially. Some of the proposed R&D work that may be considered for alternative platforms and structures are:

• Development of low cost anchoring and moorings systems suitable for offshore wind installations in varying water depths.
• Optimization studies to determine lowest-cost options for floating platforms.
• Coupled platform dynamic modeling – understanding research requirements.
• Exchange data on manufacturing and materials benefits arising from floating platform requirements.
• Share experience and technical data pertaining to marine ecology, regulatory requirements, and permits in deep water and installations far from shore.

Meetings

Meeting Minutes and Presentations

Meeting 1
Washington D.C., USA
October 2004
Coupled turbine/substructure dynamic modeling - A Kick-off meeting was held. Representatives from Denmark, Japan, Norway, the United Kingdom, and the United States attended. The October meeting attracted 32 participants from 8 countries. To maximize the benefit to the research community and to take advantage of experience with current turbine modeling effort in shallow water, it was decided to include both shallow and deep-water modeling.
Uncertainties associated with load prediction increase the risk for offshore machines, and the development of accurate dynamic models for load prediction is the best way to reduce these uncertainties. Participants will share their codes among the other participants and compare assumptions, model fidelity, and the results of model outputs for controlled cases determined by the group. Through this type of rigorous sharing and subsequent validation efforts, offshore researchers will accelerate the development of codes for modeling a wide range of offshore wind turbines systems.

Meeting 2
Risø, Denmark
January 13-14 2005
Offshore Modeling
Needs Workshop
A research topic “Coupled turbine/substructure dynamic modeling” was discussed and targeted for detailed collaborations and planning.

Meeting Documents

Meeting 3
Trondheim, Norway
June 2005

Meeting Documents

Meeting 4
Risø, Denmark
October 2005