An important class of floating wave energy converters (that includes the IPS buoy, the Wavebob and the PowerBuoy) comprehends devices in which the energy is converted from the relative (essentially heaving) motion between two bodies oscillating differently. The paper considers the case of the IPS buoy, consisting of a floater rigidly connected to a fully submerged vertical (acceleration) tube open at both ends. The tube contains a piston whose motion relative to the floater-tube system (motion originated by wave action on the floater and by the inertia of the water enclosed in the tube) drives a power take-off mechanism (PTO) (assumed to be a linear damper). To solve the problem of the end-stops, the central part of the tube, along which the piston slides, bells out at either end to limit the stroke of the piston. The use of a hydraulic turbine inside the tube is examined as an alternative to the piston. A frequency domain analysis of the device in regular waves is developed, combined with a one-dimensional unsteady flow model inside the tube (whose cross-section is in general non-uniform). Numerical results are presented for a cylindrical buoy in regular waves, including the optimization of the acceleration tube geometry and PTO damping coefficient for several wave periods.
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ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
June 19–24, 2011
Rotterdam, The Netherlands
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4437-3
PROCEEDINGS PAPER
Modelling of the IPS Buoy Wave Energy Converter Including the Effect of Non-Uniform Tube Cross-Section
Anto´nio F. O. Falca˜o,
Anto´nio F. O. Falca˜o
Technical University of Lisbon, Lisbon, Portugal
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Jose´ J. M. B. Caˆndido,
Jose´ J. M. B. Caˆndido
Technical University of Lisbon, Lisbon, Portugal
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Paulo A. P. Justino,
Paulo A. P. Justino
Laborato´rio Nacional de Energia e Geologia, Lisbon, Portugal
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Joa˜o C. C. Henriques
Joa˜o C. C. Henriques
Technical University of Lisbon, Lisbon, Portugal
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Anto´nio F. O. Falca˜o
Technical University of Lisbon, Lisbon, Portugal
Jose´ J. M. B. Caˆndido
Technical University of Lisbon, Lisbon, Portugal
Paulo A. P. Justino
Laborato´rio Nacional de Energia e Geologia, Lisbon, Portugal
Joa˜o C. C. Henriques
Technical University of Lisbon, Lisbon, Portugal
Paper No:
OMAE2011-49117, pp. 289-298; 10 pages
Published Online:
October 31, 2011
Citation
Falca˜o, AFO, Caˆndido, JJMB, Justino, PAP, & Henriques, JCC. "Modelling of the IPS Buoy Wave Energy Converter Including the Effect of Non-Uniform Tube Cross-Section." Proceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. Volume 5: Ocean Space Utilization; Ocean Renewable Energy. Rotterdam, The Netherlands. June 19–24, 2011. pp. 289-298. ASME. https://doi.org/10.1115/OMAE2011-49117
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