Investigation of moonpools as pitch motion reducing device
Moonpools as a device for reducing pitch motion is investigated experimentally, numerically and by an approximate theory. A two-dimensional study is carried out of a rectangular body with two moonpools. Forced heave and pitch motion, as well as freely floating body in regular waves are studied. The...
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Veröffentlicht in: | Applied ocean research 2021-03, Vol.108, p.102477, Article 102477 |
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Sprache: | eng |
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Zusammenfassung: | Moonpools as a device for reducing pitch motion is investigated experimentally, numerically and by an approximate theory. A two-dimensional study is carried out of a rectangular body with two moonpools. Forced heave and pitch motion, as well as freely floating body in regular waves are studied. The body geometry is varied; two drafts and five different moonpool inlet configurations are considered; rounded and squared inlets, as well as vertical plates (appendages) extending below the inlet with three different depths. The outer corners of the body are square. There is a resonance as well as cancellation period in both pitch and heave, where the cancellation is the desired effect. By cancellation period we refer to a narrow period range where the pitch motion is nearly cancelled, due to the pressures induced by the moonpool piston-mode resonance. Our investigation reveals that the cases with rounded and square moonpool inlet geometries are most efficient in cancelling the pitch motions. |
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ISSN: | 0141-1187 1879-1549 |
DOI: | 10.1016/j.apor.2020.102477 |