期刊
OCEAN ENGINEERING
卷 112, 期 -, 页码 66-75出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2015.12.001
关键词
Roll motion under beams seas; Roll center; Center of roll; Roll center straight line locus; Average roll center; Roll linear potential flow; Roll viscous effects; Roll analytical approach
资金
- CNPq (Conselho Nacional de Pesquisa - Brazilian National Research Council) [165077/2014-0]
Surprisingly, the so-called roll center is not a concept well defined for rolling ships or platforms that are submitted to a wave field. The paper proposes a definition and shows a methodology to assess this point. For beam wave incidence on a symmetric body, the roll center is not necessarily located at the line of symmetry of this body. For regular waves, the locus of the instantaneous center of rotation is a frequency dependent straight line. This investigation using basic equations of the rigid body kinematics, reports model tests, frequency domain calculations and devises a closed form equation for the instantaneous center of rotation locus. The matching is very clear. For a platform, which will usually operate in beam seas, it does make sense to have non-symmetrical bilge keels width in each board. (C) 2015 Elsevier Ltd. All rights reserved.
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