The Direct Drive System developed by Electro Standards Laboratories and the University of Rhode Island team employs small electric generators that are directly driven via a surface buoy’s wave-induced heave motion. This system provides power from the differential motion between the buoy float and a submerged resistant plate. This configuration provides reliable operation without the need for additional gearing and has the ability to harness electrical power in the 1 to 10 Watt range in small sea states (WMO Sea State 1: Calm). The buoy response in the Direct Drive System is designed to match a wide range of expected ocean wave spectra based on the deployment location. Direct Drive of the system with wave motion results in broad band response with high efficiency. Other benefits of this system include low acoustic noise and stealthy operation.
The Resonant Drive System developed by the collaboration of Electro Standards Laboratories and the University of Rhode Island employs small electric generators that are resonantly driven via a surface buoy’s wave-induced heave motion. This system amplifies the generator’s armature motion at the peak period of the sea state (WMO Sea State 1: Calm). The buoy response in the Resonant Drive System is designed to match the expected ocean wave spectrum based on the deployment location. The benefits of the resonant system include enhanced functionality, higher performance and continuous operation. The buoy is completely sealed with no external moving parts.
Scale model testing of the Direct Drive and Resonant Drive Systems has been performed in the University of Rhode Island Department of Ocean Engineering wave tank as well as at the mouth of Rhode Island’s Narragansett Bay. Electro Standards Laboratories’
An informative White Paper has been generated detailing these developments. The White Paper includes photos of the launch of these test systems as well as a graph of the Pierson Moskowitz Spectra. This White Paper is available for a free download at the company’s Website: http://www.electrostandards.com/