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Wave impact loads on wave-piercing catamarans

Lavroff, J; Davis, MR; Holloway, DS; Thomas, GA; McVicar, JJ; (2017) Wave impact loads on wave-piercing catamarans. Ocean Engineering , 131 pp. 263-271. 10.1016/j.oceaneng.2016.11.015. Green open access

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Abstract

Wave slamming is investigated for the 112 m INCAT wave-piercer catamaran with reference to experimental work conducted at full scale, numerical computation by CFD and FEA and testing at model scale using a 2.5 m segmented hydro-elastic model. The segmented model was tested in regular head seas to investigate the magnitude and location of the dynamic wave slam force and slam induced hull bending moments. The model consists of rigid segments joined by elastic hinges designed to match the scaled first longitudinal modal (whipping) frequency measured at full-scale on the INCAT 112 m vessel. Effects of forward speed and wave encounter frequency on slamming and whipping were investigated. Scaled slam forces of up to 2150 t weight (21.1 MN) were measured during model tests for a full-scale vessel with a loaded displacement of 2500 t. These slams can impart impulses on the bow of up to 938 t weight-seconds (9.20 MNs) and strain energy of up to 3.5 MJ into the ship structure based on scaled model test data. The impact energy is transferred primarily to the main longitudinal whipping mode, which decays with an overall structural damping ratio of 0.02–0.06, this being strongly dependent on internal frictional mechanisms within the ship structure.

Type: Article
Title: Wave impact loads on wave-piercing catamarans
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.oceaneng.2016.11.015
Publisher version: http://doi.org/10.1016/j.oceaneng.2016.11.015
Language: English
Additional information: © 2016 Elsevier Ltd. All rights reserved. This manuscript version is made available under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International license (CC BY-NC-ND 4.0). This license allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licenses are available at https://creativecommons.org/licenses/. Access may be initially restricted by the publisher.
Keywords: Slamming; Catamaran; Whipping; Modal frequencies; Mode shape; Hydroelastic segmented model; Slam loads; Bending moments
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1538453
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