Floating body second order slow drift force spectrum

Conference · Tue Dec 31 00:00:00 EST 1996

OSTI ID:449688

Aranha, J A.P. ^[1]; Fernandes, A C ^[2]

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1. Univ. of Sao Paulo (Brazil). Dept. of Naval Architecture and Ocean Engineering
2. PETROBRAS, E and P/GETINP/GESEM, Rio de Janeiro (Brazil)

In this paper it is shown that the slow drift force spectrum of a floating body, obtained from the quadratic transfer function, can be approximated, in the range of interest ({mu} {much_lt} 1) by a white noise of the form S{sub F}({mu}) = S{sub F}(0) + O({mu}{sup 2}) where S{sub F}(0) can be computed from the known drift force coefficient in harmonic waves and the wave energy spectrum. It is also shown here that a special and normally used form of Newman`s approximation represents the spectrum S{sub F}({mu}) with an error [1 + O({mu}{sup 2})] in the low frequency regime. It is also shown that a well chosen Newman`s Approximations may be O({mu}{sup 2}) instead of only O({mu}).

• OSTI ID: 449688
• Report Number(s): CONF-9606279-; ISBN 0-7918-1490-4; TRN: IM9714%%245
• Resource Relation: Conference: 14. international conference on offshore mechanics arctic engineering (OMAE), Florence (Italy), 16-20 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the 15. international conference on offshore mechanics and arctic engineering -- OMAE 1996. Volume 1, Part A: Offshore technology; Chakrabarti, S.K. [ed.] [Chicago Bridge and Iron Technical Services Co., Plainfield, IL (United States)]; Pontes, M.T. [ed.] [Inst. Nacional de Engenharia e Tecnologia Industrial, Lisbon (Portugal)]; Maeda, Hisaaki [ed.] [Univ. of Tokyo (Japan)]; Falzarano, J. [ed.] [Univ. of New Orleans, LA (United States)]; Schofield, P. [ed.] [W.S. Atkins, Surrey (United Kingdom)]; Morrison, D. [ed.] [Shell E and P Technology Co., Houston, TX (United States)]; PB: 530 p.
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
OFFSHORE PLATFORMS
ENERGY SPECTRA
WAVE FORCES
FLUID-STRUCTURE INTERACTIONS
WATER WAVES
HYDRODYNAMICS
TRANSFER FUNCTIONS