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Abstract

Wave slamming is investigated for the 112 m INCAT wave-piercer catamaran with reference to experimentalwork conducted at full scale, numerical computation by CFD and FEA and testing at model scale using a 2.5 msegmented hydro-elastic model. The segmented model was tested in regular head seas to investigate themagnitude and location of the dynamic wave slam force and slam induced hull bending moments. The modelconsists 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 waveencounter 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. Theseslams can impart impulses on the bow of up to 938 t weight-seconds (9.20 MNs) and strain energy of up to 3.5MJ into the ship structure based on scaled model test data. The impact energy is transferred primarily to themain longitudinal whipping mode, which decays with an overall structural damping ratio of 0.02–0.06, thisbeing strongly dependent on internal frictional mechanisms within the ship structure.

Item Type:	Article
Authors/Creators:	Lavroff, J and Davis, MR and Holloway, DS and Thomas, GA and McVicar, JJ
Keywords:	slamming, wave impact loads, wave piercing catamaran, whipping vibration
Journal or Publication Title:	Ocean Engineering
Publisher:	Pergamon-Elsevier Science Ltd
ISSN:	0029-8018
DOI / ID Number:	https://doi.org/10.1016/j.oceaneng.2016.11.015
Copyright Information:	Copyright 2016 Elsevier Ltd.
Related URLs:	Google Scholar: Lavroff, J UTAS Profile: Lavroff, J UTAS Profile: Davis, MR Google Scholar: Holloway, DS UTAS Profile: Holloway, DS UTAS Profile: McVicar, JJ
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