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- Category: Articles
Atmospheric Stability Significant for Wind Turbine Energy and Sound Production
Atmospheric stability has a significant influence on the wind profile, or the degree of increase of wind velocity with height. For tall wind turbines atmospheric stability is not a ‘small perturbation’ but a major factor determining the energy yield as well as the noise impact in the environment. Noise complaints and recent research show that noise from modern, tall, variable speed wind turbines is not a relatively featureless sound increasing steadily with near-ground wind speed, but – in a stable atmosphere – a thumping sound relatively independent of near-ground wind speed.
By Frits van den Berg, University of Groningen, The Netherlands
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Atmospheric stability has a significant influence on the wind profile, or the degree of increase of wind velocity with height. For tall wind turbines atmospheric stability is not a ‘small perturbation’ but a major factor determining the energy yield as well as the noise impact in the environment. Noise complaints and recent research show that noise from modern, tall, variable speed wind turbines is not a relatively featureless sound increasing steadily with near-ground wind speed, but – in a stable atmosphere – a thumping sound relatively independent of near-ground wind speed. By Frits van den Berg, University of Groningen, The Netherlands
- Category: Articles
A Wind System using the Bernoulli Principle
Green Energy Technologies (GET), a company based in Akron, Ohio, USA, is introducing a unique wind system (with 1MW, 500kW, 100kw and custom rooftop models) called the SmartEnergy Spire, which creates a ‘wind tunnel’ effect forcing the wind around the Spire. Using the Bernoulli principle, the Spire design creates an efficiency of 1.676 two times the throughput over a traditional wind turbine using ambient wind.By Dr Majid Rashidi and Mark Cironi, Green Energy Technologies, USA
- Category: Articles
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.- Category: Articles
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.By Ryosuke Ito, President, Zephyr Corporation, Japan
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- Category: Articles
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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- Category: Articles
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
- Improving Wind Energy’s Market Penetration
- Measurement at 80 Metres with a New Design Wind Mast
- Turbine Shortages and Rising Costs Stall Development
- Aerodynamic Damping
- Sharing the Sea
- Offshore Wind Farm Layout Optimisation
- New BAUER Flydrill system
- Investigation of Stability Effects of an Offshore Wind Turbine
- AeroBlade
- Geotechnical Analysis Requirements
- Electric Vehicles with V2G
- The Benefits of Cooperation
- The Atmospheric Vortex Engine
- Acoustical Behaviour of a Wind Turbine
- Railwind Turbine
- Computational Fluid Dynamics
- Damage to wind turbines from typhoons
- Deep Offshore Wind Farms
- Economics of Intermittent Wind Generation
- The Aeolus Project
- A New Control Concept for Offshore Wind Farms
- Offshore Potential in Japan
- The Concrete Gravity Concept
- Trends in Rotor Blade Design
- Renewable Connections on the Web
- Small Wind Turbines for Rural Areas
- How Reliable is Torque?
- Certification of Power Generation Characteristics
- Impact of Hourly Wind Power Variations
- Offshore Landing Systems
