Asymmetric roll center of symmetric body in beam waves
| Autor: | Anderson R. W. Soares, Antonio Carlos Fernandes, Peyman Asgari |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0209 industrial biotechnology
Engineering Environmental Engineering business.industry Mathematical analysis 020101 civil engineering Ocean Engineering 02 engineering and technology Rigid body 0201 civil engineering Bilge keel 020901 industrial engineering & automation Classical mechanics Beam (nautical) Frequency domain Roll center Line (geometry) business Roll moment Instant centre of rotation |
| Zdroj: | Ocean Engineering. 112:66-75 |
| ISSN: | 0029-8018 |
| DOI: | 10.1016/j.oceaneng.2015.12.001 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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