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The hydrodynamic performance of an integrated semi-submersible platform with wave energy converters: a concept for multi-use platforms


Gubesch, E and Chin, C and Abdussamie, N and Penesis, I, The hydrodynamic performance of an integrated semi-submersible platform with wave energy converters: a concept for multi-use platforms, Proceedings of Australasian Coasts & Ports Conference 2019, 10-13 September 2019, Hobart, Australia, pp. 1-7. ISBN 978-1-925627-23-7 (2019) [Refereed Conference Paper]

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To meet the increasing demand for energy and seafood, the development of offshore platforms that combine multiple functions within the same facility are being considered to extract energy from waves, tides and wind as a power source for marine aquaculture and other offshore infrastructure. In this paper, the hydrodynamic aspect of a floating column-stabilised platform integrated with oscillating water column (OWC) wave energy converters was experimentally investigated at the Australian Maritime College’s Model Test Basin. The model was based on a previously tested platform with integrated Spar-buoy OWCs and accommodated a horizontal soft mooring system. The experimental set-up allowed for the measurement of wave elevation in-phase to the model and inside the OWC chamber, air-pressure in the forward and aft columns, mooring tension and motion response. The computation of the OWC efficiency was defined in terms of the capture width ratio, while response amplitude operators (RAO’s) were employed in the analysis of the maximum motion response. The peak hydrodynamic performance of the OWCs and maximum RAO motions did not align with either the pitch, heave or OWC moonpool resonant frequency. This outcome may be a result of coupling, as the pitch and heave decay tests identified nonlinear decay rates. From the measured time series of both wave elevation and air pressure inside the OWC chamber, there was evidence that water sloshing had occurred which may have affected the efficiency. The hydrodynamic performance of the forward and aft OWCs differed significantly, where the aft capture width ratio was reduced by 40% and the power absorbed reduced by 55% compared to the forward OWC. This performance response was likely to be affected by the disturbance of the wave field from the structure forward of the aft OWC. Further testing is required to investigate coupling and its effects on hydrodynamic performance.

Item Details

Item Type:Refereed Conference Paper
Keywords:wave energy converter, multipurpose offshore platform, wave energy converter array, pitching floating structure, oscillating water column
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Marine engineering
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Adaptation to climate change
Objective Field:Climate change adaptation measures (excl. ecosystem)
UTAS Author:Gubesch, E (Mr Eric Gubesch)
UTAS Author:Chin, C (Dr Chris Chin)
UTAS Author:Abdussamie, N (Dr Nagi Abdussamie)
UTAS Author:Penesis, I (Professor Irene Penesis)
ID Code:135508
Year Published:2019
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2019-10-28
Last Modified:2019-11-07

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