Latching Control of an Oscillating Water Column Device with Air Compressibility
A linearised model of air compressibility is developed and integrated with the conventional hydrodynamic model of an OWC. This is optimised in the frequency domain and the effects of compressibility are explored. Numerical predictions are validated by experiment. A latching control strategy is described and optimised by first harmonic methods. Simulations show that the approximate frequency domain analysis is accurate and that useful gains in efficiency can be realised by latching.
KeywordsVortex Compressibility Breakwater
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- 1).Budal, K. and Faines, J., ‘Interacting Point Absorbers With Controlled Motion’ in ’Power From Sea Waves’ ed. B.M. Count, Academic Press, 1980.Google Scholar
- 3).Penney, T., McCormick, M. and Miles, J., ‘Development Program Leading to an Optimised OWC Wave Energy Converter’, Proc. AIAA 2nd Terrestrial Energy Systems Conference, 1981, Colorado Springs, USA.Google Scholar
- 4).Wave Energy Programme Feasibility Study on a Submerged Resonant Duct, Third Report’, contract No. E/5A/con/1518, Vickers Limited, Engineering Group, Design and Projects Division, 1979.Google Scholar
- 5).Moody G.W., ‘The NEL Breakwater - A Realistic Approach to Wave Energy Conversion’, Proc. Marintec Offshore China, Shanghai 1983.Google Scholar
- 6).Evans, D.V., ‘Wave Power Absorption by Systems of Oscillating Surface Pressure Distributions’, J. Fluid Mech. (1982), vol.114.Google Scholar
- 7).Jefferys, E.R., ‘Simulation of Wave Power Devices, Applied Ocean Research, 1984, vol.6, no. 1.Google Scholar
- 8).Jefferys, E.R. and Samra, B.S., ’ Adaptive Prediction of the Motion of Marine Vehicles’, Proc. 4th ASME OMAE conf., Dallas 1985.Google Scholar