Viscous damping forces for slow drift oscillation of the floating structure acting on the hull and mooring lines

W. Koterayama; Masahiko Nakamura; Y. Kyozuka

Viscous damping forces for slow drift oscillation of the floating structure acting on the hull and mooring lines

W. Koterayama, Masahiko Nakamura, Y. Kyozuka

Division of Earth Environment Dynamics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

Abstract

An experimental study on the viscous drag forces acting on the model of a semi-submersible oscillating in waves is carried out. The dynamic tensions of mooring lines are also measured. The experimental studies are carried out with the view of studying damping forces for the slow drift oscillation. The Morison equation extended to the Relative motion concept is applied in the analyses of the viscous drag force acting on the model oscillating with the large amplitude and long period in waves. Experiments show that the drag coefficients depend on the reduced velocity defined by the maximum velocity of the slow oscillation, period of incident wave and diameter of the column. The results are compared with those obtained by applying the Independent flow field concept.

Original language	English
Title of host publication	Proceedings of the International Offshore Mechanics and Arctic Engineering Symposium
Publisher	Publ by American Soc of Mechanical Engineers (ASME)
Pages	497-503
Number of pages	7
Volume	2
Edition	8 th
Publication status	Published - 1989
Event	Proceedings of the Eighth International Conference on Offshore Mechanics and Arctic Engineering - 1989 - Hague, Neth Duration: Mar 19 1989 → Mar 23 1989

Other

Other	Proceedings of the Eighth International Conference on Offshore Mechanics and Arctic Engineering - 1989
City	Hague, Neth
Period	3/19/89 → 3/23/89

All Science Journal Classification (ASJC) codes

Engineering(all)

Cite this

Viscous damping forces for slow drift oscillation of the floating structure acting on the hull and mooring lines. / Koterayama, W.; Nakamura, Masahiko; Kyozuka, Y.
Proceedings of the International Offshore Mechanics and Arctic Engineering Symposium. Vol. 2 8 th. ed. Publ by American Soc of Mechanical Engineers (ASME), 1989. p. 497-503.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Koterayama, W, Nakamura, M & Kyozuka, Y 1989, Viscous damping forces for slow drift oscillation of the floating structure acting on the hull and mooring lines. in Proceedings of the International Offshore Mechanics and Arctic Engineering Symposium. 8 th edn, vol. 2, Publ by American Soc of Mechanical Engineers (ASME), pp. 497-503, Proceedings of the Eighth International Conference on Offshore Mechanics and Arctic Engineering - 1989, Hague, Neth, 3/19/89.

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N2 - An experimental study on the viscous drag forces acting on the model of a semi-submersible oscillating in waves is carried out. The dynamic tensions of mooring lines are also measured. The experimental studies are carried out with the view of studying damping forces for the slow drift oscillation. The Morison equation extended to the Relative motion concept is applied in the analyses of the viscous drag force acting on the model oscillating with the large amplitude and long period in waves. Experiments show that the drag coefficients depend on the reduced velocity defined by the maximum velocity of the slow oscillation, period of incident wave and diameter of the column. The results are compared with those obtained by applying the Independent flow field concept.

AB - An experimental study on the viscous drag forces acting on the model of a semi-submersible oscillating in waves is carried out. The dynamic tensions of mooring lines are also measured. The experimental studies are carried out with the view of studying damping forces for the slow drift oscillation. The Morison equation extended to the Relative motion concept is applied in the analyses of the viscous drag force acting on the model oscillating with the large amplitude and long period in waves. Experiments show that the drag coefficients depend on the reduced velocity defined by the maximum velocity of the slow oscillation, period of incident wave and diameter of the column. The results are compared with those obtained by applying the Independent flow field concept.

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AN - SCOPUS:0024867744

VL - 2

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EP - 503

BT - Proceedings of the International Offshore Mechanics and Arctic Engineering Symposium

PB - Publ by American Soc of Mechanical Engineers (ASME)

T2 - Proceedings of the Eighth International Conference on Offshore Mechanics and Arctic Engineering - 1989

Y2 - 19 March 1989 through 23 March 1989

ER -

Viscous damping forces for slow drift oscillation of the floating structure acting on the hull and mooring lines

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All Science Journal Classification (ASJC) codes

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