Ice Load Generation in Time Domain Based on Ice Load Spectrum for Arctic Offshore Structures

Kim, Youngshik; Kim, Jinha; Kang, Kuk-Jin; Han, Sang-Cheol; Kim, Jinwhan

doi:10.26748/ksoe.2018.32.6.411

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…Wind and current forces that affect a floating body are determined by their respective velocities and the incident angle of the force (Kim et al, 2018). They are defined as Eqs.…”

Section: Wind and Current Forcementioning

confidence: 99%

A Study on the Dynamic Analysis of Mooring System During Hook-up Installation

Lee¹,

Jo²,

Lee³

et al. 2020

J. Ocean Eng. Technol.

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This study evaluated the Hook-up installation of an offshore site construction process, which is the final step in an offshore site installation process. During Hook-up installation, the offshore structure can have a detrimental effect on the work stability due to low-frequency motion. Moreover, economic costs can be incurred by the increase in available days of a tugboat. Therefore, this study developed a numerical analysis program to assess the dynamic behavior of mooring systems during hook-up installation to analyze the generally performed installation process and determine when the tugboat should be released. In this program, the behavior of an offshore structure was calculated using Cummin's time-domain motion equation, and the mooring system was calculated by Lumped mass method (LMM). In addition, a tugboat algorithm for hook-up installation was developed to apply the Hook-up procedure. The model used in the calculations was the barge type assuming FPSO (Floating production storage and off-loading) and has a taut mooring system connected to 16 mooring lines. The results of the simulation were verified by comparing with both MOSES, which is a commercial program, and a calculation method for restoring coefficient matrix, which was introduced by Patel and Lynch (1982). Finally, the offset of the structure according to the number of tugboats was calculated using the hook-up simulation, and the significant value was used to represent the calculation result.

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“…Wind and current forces that affect a floating body are determined by their respective velocities and the incident angle of the force (Kim et al, 2018). They are defined as Eqs.…”

Section: Wind and Current Forcementioning

confidence: 99%

A Study on the Dynamic Analysis of Mooring System During Hook-up Installation

Lee¹,

Jo²,

Lee³

et al. 2020

J. Ocean Eng. Technol.

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“…Recently, ice load generation methods that consist of complex environmental loads have been suggested for the evaluation of station-keeping performance in the time domain. In [16], an ice load generation method was proposed by combining the mean values of the ice load from the ice tank test and the spectrum values from GEM. Another similar method that generates ice forces on the structure at an arbitrary heading angle was introduced for use in the time-domain analysis [17].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Effectiveness of the Heading Control on the Mooring Line Tension and Position Offset for an Arctic Floating Structure under Complex Environmental Loads

Kang

Lee

Lim

et al. 2021

JMSE

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Even though interest in developing the Arctic region is increasing continuously, the standard procedure to be used to analyze the station-keeping performance of a floater considering ice loads has not been established yet. In this paper, the effectiveness of heading control with a dynamic positioning system is analyzed to evaluate the improvement of the performance of the station-keeping system in the ice conditions. Complex environmental loads with ice-induced forces were generated and applied to a ship type floater with dynamic positioning and mooring systems. Three-hour time-domain simulations were conducted for the two different station-keeping systems with mooring only and mooring with a dynamic positioning system. Position offsets and mooring line tensions for the two scenarios were compared with maximum values and most probable maxima (MPM) values. The results of the simulation showed that the heading control can reduce 8.2% of MPM values for the mooring lines and improve the station-keeping performance by about 16.3%. The validity of the station-keeping system that was designed was confirmed, and it is expected that the specification of mooring lines can be relaxed with the heading control.

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“…For this purpose, a separate module must be developed to generate ice loads and reflect the ice loads in the motion analysis. Utilizing GEM and the mean value of the ice loads obtained from a tank experiment result, Kim et al (2018b) proposed an ice load generation method using the spectral values of the variable components. However, the ice loads were measured only at a certain angle.…”

mentioning

confidence: 99%