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Offshore Winds Observed from Space |
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Friday, 07 July 2006 |
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Issues for Planning of Offshore Wind Farms  Satellites orbiting and observing Earth offer potential for the offshore wind farm industry. Of particular interest are the images from the Synthetic Aperture Radars (SAR) on board satellites belonging to the European Space Agency (ESA): the satellites ERS-1 and ERS-2 from 1992 to present and Envisat from 2002 to present. In the April/May 2005 issue of Windtech International we published an article about this topic. The current article describes more specific issues concerning offshore wind farms.
By Merete Bruun Christiansen, Charlotte Bay Hasager, Risø National Laboratory, Denmark and Frank Monaldo, Johns Hopkins University, USA
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Increased Performance by Condition Monitoring of Rotor Blades |
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Friday, 07 July 2006 |
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Prevention of Operational Hazards and Enhancing the Ongoing Maintenance
 Monitoring of the condition of rotor blades is performed visually by experts every one to two years, but it is very subjective and superficial. As is common in energy facilities, the increases in stress resulting from greater blade size, coupled with the rising prices for rotor blades, call for a new approach. The continuous monitoring of the status of highly stressed parts offers preventative maintenance as well as troubleshooting of existing problems.
By Dr Peter Volkmer, Managing Director, IGUS, Germany
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Zephyr’s ‘Airdolphin’ |
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Friday, 07 July 2006 |
The Development of an Ultra High-Performance Wind Turbine
 Small wind turbines are used in situations that are quite different from those of large turbines, and it is the small turbine market that is now experiencing the entry of new companies seeking to benefit from its expected growth. While a growing market is good news, it has been argued that the levels of performance and safety need to be greatly improved, and prices drastically reduced, before small wind turbines are accepted by society in general. In this article, the author describes the concept of the Airdolphin. |
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A Motion Compensated Platform for Wind Turbine Maintenance |
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Friday, 07 July 2006 |
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Reducing the costs of operation and maintenance offshore
 ICD Projects designed a motion compensated platform following a request from the Norwegian shipowner FOB Shipping for an active heave compensated crane. This article illustrates the importance of creativity and how even relatively small technological innovations may have a significant impact on the economic feasibility of offshore wind farms. |
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Aerodynamic Damping |
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Thursday, 01 June 2006 |
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A Secret to Success for Offshore Wind Turbines  When wind turbines are placed offshore, we introduce a longer and therefore less stiff structure in an environment with more loads than onshore. These loads will cause significantly more motions and stress variations in the structure, making it much more sensitive to fatigue. However, the back and forth motion of the structure’s vibration does have a positive effect. When the tower top moves forward, the turbine feels extra wind, which creates extra loads on the blades pushing against the wind. Moving back, the same principle applies the other way round. This phenomenon is called aerodynamic damping and has a significant effect on a structure during its lifetime. In order to benefit from this phenomenon, it is essential to understand it. By David Cerda Salzmann and Jan van der Tempel, Delft University of Technology Offshore Engineering, the Netherlands |
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