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Forced heaving motion of a floating air-filled bag

Forced heaving motion of a floating air-filled bag
Forced heaving motion of a floating air-filled bag
A proposed wave energy converter related to that described by Farley (2011) consists of a pressurised axi-symmretic air-filled bag, ballasted to float at about half depth. The bag contracts and expands under the action of wave-induced heaving motion, pumping air into and out of a secondary, rigid, chamber which acts as an air spring.
This paper describes experiments and numerical modelling aimed at understanding the behaviour of this device. Rather than test it in waves, in this initial investigation we chose to replace the power take-off with an oscillating air pump. Forcing air into and out of the bag periodically caused it to heave and radiate waves when floating in water initially at rest. Measurements of the bag’s response are compared with the predictions of a linear frequency-domain radiation theory, which uses a finite difference approach to model the harmonic deformations of the bag. Agreement is promising on the whole, providing some insights into the likely performance of the device when operating as a wave energy converter.
Marine Engineering, Wave action
Chaplin, John
d5ed2ba9-df16-4a19-ab9d-32da7883309f
Farley, Francis
96c5b9fa-9af4-49b3-8f26-12b06d2e0d89
Kurniawan, Adi
7c4b39b8-27fa-4707-a3ce-6c80342c3aa1
Greaves, Deborah
3e92bac9-ef06-408d-8722-fe840fcaa43c
Hann, Martyn
5ae72411-3dc6-4683-92eb-db08ee35fc07
Chaplin, John
d5ed2ba9-df16-4a19-ab9d-32da7883309f
Farley, Francis
96c5b9fa-9af4-49b3-8f26-12b06d2e0d89
Kurniawan, Adi
7c4b39b8-27fa-4707-a3ce-6c80342c3aa1
Greaves, Deborah
3e92bac9-ef06-408d-8722-fe840fcaa43c
Hann, Martyn
5ae72411-3dc6-4683-92eb-db08ee35fc07

Chaplin, John, Farley, Francis, Kurniawan, Adi, Greaves, Deborah and Hann, Martyn (2015) Forced heaving motion of a floating air-filled bag. 30th International Workshop on Water Waves and Floating Bodies, Bristol, United Kingdom. 12 - 15 Apr 2015. 4 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

A proposed wave energy converter related to that described by Farley (2011) consists of a pressurised axi-symmretic air-filled bag, ballasted to float at about half depth. The bag contracts and expands under the action of wave-induced heaving motion, pumping air into and out of a secondary, rigid, chamber which acts as an air spring.
This paper describes experiments and numerical modelling aimed at understanding the behaviour of this device. Rather than test it in waves, in this initial investigation we chose to replace the power take-off with an oscillating air pump. Forcing air into and out of the bag periodically caused it to heave and radiate waves when floating in water initially at rest. Measurements of the bag’s response are compared with the predictions of a linear frequency-domain radiation theory, which uses a finite difference approach to model the harmonic deformations of the bag. Agreement is promising on the whole, providing some insights into the likely performance of the device when operating as a wave energy converter.

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More information

Published date: 12 April 2015
Venue - Dates: 30th International Workshop on Water Waves and Floating Bodies, Bristol, United Kingdom, 2015-04-12 - 2015-04-15
Keywords: Marine Engineering, Wave action

Identifiers

Local EPrints ID: 426426
URI: https://eprints.soton.ac.uk/id/eprint/426426
PURE UUID: b1234ed9-5c98-403b-a9b7-dbec957dff3d

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Date deposited: 27 Nov 2018 17:30
Last modified: 27 Nov 2018 17:30

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Contributors

Author: John Chaplin
Author: Francis Farley
Author: Adi Kurniawan
Author: Deborah Greaves
Author: Martyn Hann

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