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Analysis of a pitching-and-surging wave-energy converter that reacts against an internal mass, when operating in regular sinusoidal waves.

Widden, M. B. and French, M. J. and Aggidis, George A. (2008) Analysis of a pitching-and-surging wave-energy converter that reacts against an internal mass, when operating in regular sinusoidal waves. Proceedings of the institution of mechanical engineers conference: part M: journal of engineering for the maritime environment, 222 (Number). pp. 153-161. ISSN 1475-0902

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Abstract

The paper examines the behaviour of a pitching-and-surging wave-energy converter driven by unidirectional waves that exert harmonically varying forces on its hull. The power take-off (PTO) is by means of an inertia that moves either on a straight horizontal rail or on an arm that turns about a horizontal axis. Angular displacements are taken to be small, so that linear analysis is appropriate; these are idealized conditions, but any wave-energy converter must be able to operate effectively in ideal conditions. For good power capture with the least engineering difficulties, it is found that the power take-off inertia should be centred as high as possible above the overall centre of mass G. It is shown that power is captured from the waves by motion of the centre of pressure P relative to the overall centre of mass G. This can only result from motion in pitch and is dependent on the fact that there is a large vertical distance between points P and G. It is found in practical cases that the added mass of water generally brings G closer to P, and this limits the power that can be captured.

Item Type: Article
Journal or Publication Title: Proceedings of the institution of mechanical engineers conference: part M: journal of engineering for the maritime environment
Uncontrolled Keywords: pitching ; surging ; wave-energy converter ; internal mass ; sinusoidal waves
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: Faculty of Science and Technology > Engineering
ID Code: 33725
Deposited By: Mrs Yaling Zhang
Deposited On: 18 Jun 2010 16:54
Refereed?: Yes
Published?: Published
Last Modified: 24 Jan 2014 05:18
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/33725

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