Chapter
Dec 31, 2015
Mechanically Coupled Buoyant Flaps: Theory and Experiment
Authors: Charles K. Sollitt, M.ASCE, Chung-Pan Lee, William G. McDougal, AM.ASCE, and Thomas J. PerryAuthor Affiliations
Publication: Coastal Engineering 1986
Abstract
A system composed of two buoyant flaps hinged at the sea floor and coupled with weighted mooring lines is modeled analytically and experimentally. The system behavior is described theoretically utilizing an eigenseries representation of linear wave theory in the vicinity of the breakwater. The structure dynamics are modeled in terms of structure weight, inertia, buoyancy, damping, mooring line tension and the wave pressure field.
The mechanically coupled system provides shelter by reflecting incident waves and by attenuating wave energy through structural and viscous damping. The structure can be tuned to minimize wave transmission within a particular frequency range by changing the flap spacing and adjusting the mass and equilibrium position of the mooring line weights.
The theory is validated with experimental results for models fabricated from inflatable, parallel-tube membranes. Buoyancy and inertia are changed by filling tubes with air and/or water. Single and double flaps are examined with and without mooring lines. Incident, reflected, and transmitted waves are measured as well as flap motion. Theoretical results are corroborated by the experiments and the importance of including damping in the model is demonstrated.
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Published In
Coastal Engineering 1986
Pages: 2445 - 2459
Copyright
© 1987 American Society of Civil Engineers.
History
Published online: Dec 31, 2015
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Authors
Affiliations
Charles K. Sollitt, M.ASCE
Director of O.H. Hinsdale Wave Research Laboratory, Oregon State University, Corvallis, OR 97331.
Chung-Pan Lee
Graduate Research Assistant in Ocean Engineering, Oregon State University, Corvallis, OR 97331.
William G. McDougal, AM.ASCE
Associate Professor of Civil and Ocean Engineering, Oregon State University, Corvallis, OR 97331.
Thomas J. Perry
Civil Engineering Student, Oregon State University, Corvallis, OR 97331.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
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