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Ocean Engineering

Global Loads on a FPSO Induced by a Set of Freak Waves

[+] Author and Article Information
Nuno Fonseca

Centre for Marine Technology and Engineering, and Instituto Superior Técnico, Technical University of Lisbon, Avenida Rovisco Pais, 1049-001 Lisboa, Portugalnfonseca@mar.ist.utl.pt

C. Guedes Soares1

Centre for Marine Technology and Engineering, and Instituto Superior Técnico, Technical University of Lisbon, Avenida Rovisco Pais, 1049-001 Lisboa, Portugalguedess@mar.ist.utl.pt

Ricardo Pascoal

Centre for Marine Technology and Engineering, and Instituto Superior Técnico, Technical University of Lisbon, Avenida Rovisco Pais, 1049-001 Lisboa, Portugalrpascoal@mar.ist.utl.pt

1

Corresponding author.

J. Offshore Mech. Arct. Eng 131(1), 011103 (Dec 11, 2008) (8 pages) doi:10.1115/1.2979801 History: Received July 24, 2005; Revised January 04, 2006; Published December 11, 2008

This paper presents a systematic study of the structural loads induced by abnormal waves on a floating production, storage and offloading (FPSO) platform. This work is a follow-up to a previous investigation that explored the possibility of using freak, abnormal, or episodic waves as additional wave load conditions to be considered in the design of ships and offshore platforms. In the previous work, a procedure was developed and implemented to adopt deterministic time series of wave elevation, which may include abnormal waves, as reference design conditions to calculate the wave induced structural loads on ships. An application example was presented for a FPSO subjected to the well known New Year Wave trace that was measured during a severe storm in the Central North Sea. In the present paper, the same procedure is applied to obtain the wave induced structural loads on a FPSO, but a systematic investigation is carried out by using a large set of wave traces. These wave traces have been measured at different occasions in the North Sea, additionally at one location in the Central Gulf of Mexico, and they all include episodic freak waves. In this way it is possible to assess the influence of realistic rogue wave characteristics on the wave induced structural loads. Finally, and based on the platform responses to all wave traces, some statistics are produced regarding the platform responses and structural loads induced by rogue waves.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Measurements and simulations of wave at midship, heave, pitch, and the vertical bending moment at midship in response to the Draupner New Year Wave (from Guedes Soares (4)).

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Figure 2

Time trace of the abnormal wave event

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Figure 3

Wave properties for data from North Alwyn, Draupner, and Camille

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Figure 7

Correlation between the largest sagging and hogging peaks and the abnormal wavelength

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Figure 8

Correlation between the largest sagging and hogging peaks and the abnormal wave slope

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Figure 9

Comparison between the largest sagging and hogging peaks and the rule values

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Figure 6

Correlation between the largest sagging and hogging peaks and the height of the abnormal waves

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Figure 5

Simulations of the wave elevation around the abnormal waves and the corresponding vertical bending moment at midship

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