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Forward speed prediction of a free-running wave-propelled boat

Forward speed prediction of a free-running wave-propelled boat
Forward speed prediction of a free-running wave-propelled boat
Wave-propelled boats utilize submerged flapping foils to convert wave energy directly into propulsion. For platforms that are solely propelled using submerged flapping foils, predicting the forward speed is challenging as it is time varying and dependent on the coupled responses of the wave-induced hull motions (surge, heave, and pitch) and the foil flapping motion (driven by the wave induced hull motions and incident wavy flow). To ascertain the free-running response of wave-propelled boats, this article presents a hybrid discrete time-domain numerical model and experimental results from a prototype wave-propelled autonomous surface vehicle (ASV) with forward and aft (tandem) flapping foils. Results from a series of free-running experiments in regular head waves, over a range of wave frequencies for three different foil locations, are presented and used to validate the numerical model. The model was found to show good agreement with the experimental results, capturing the coupled dynamics of the vessel and foils and oscillating forward speed, over a range of wave frequencies and foil locations. The model and results provide a valuable insight for the design of wave-propelled boats.
0364-9059
Townsend, Nicholas
3a4b47c5-0e76-4ae0-a086-cf841d610ef0
Tan, Mingyi
4d02e6ad-7915-491c-99cc-a1c85348267c
Bowker, James Andrew
7e0d368b-4c3b-4daf-a831-57158eacd738
Townsend, Nicholas
3a4b47c5-0e76-4ae0-a086-cf841d610ef0
Tan, Mingyi
4d02e6ad-7915-491c-99cc-a1c85348267c
Bowker, James Andrew
7e0d368b-4c3b-4daf-a831-57158eacd738

Townsend, Nicholas, Tan, Mingyi and Bowker, James Andrew (2020) Forward speed prediction of a free-running wave-propelled boat. IEEE Journal of Oceanic Engineering. (doi:10.1109/JOE.2020.2990143). (In Press)

Record type: Article

Abstract

Wave-propelled boats utilize submerged flapping foils to convert wave energy directly into propulsion. For platforms that are solely propelled using submerged flapping foils, predicting the forward speed is challenging as it is time varying and dependent on the coupled responses of the wave-induced hull motions (surge, heave, and pitch) and the foil flapping motion (driven by the wave induced hull motions and incident wavy flow). To ascertain the free-running response of wave-propelled boats, this article presents a hybrid discrete time-domain numerical model and experimental results from a prototype wave-propelled autonomous surface vehicle (ASV) with forward and aft (tandem) flapping foils. Results from a series of free-running experiments in regular head waves, over a range of wave frequencies for three different foil locations, are presented and used to validate the numerical model. The model was found to show good agreement with the experimental results, capturing the coupled dynamics of the vessel and foils and oscillating forward speed, over a range of wave frequencies and foil locations. The model and results provide a valuable insight for the design of wave-propelled boats.

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Forward Speed Prediction of a Free Running Wave Propelled Boat - Accepted Manuscript
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Accepted/In Press date: 20 April 2020

Identifiers

Local EPrints ID: 442253
URI: http://eprints.soton.ac.uk/id/eprint/442253
ISSN: 0364-9059
PURE UUID: 01e2130b-c83c-4803-8aa3-29c16a34d63b

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Date deposited: 10 Jul 2020 16:30
Last modified: 06 Oct 2020 19:28

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