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Investigation of Low-Frequency Pitch Motion Characteristics for KRISO Standard Offshore Structure (KSemi) Moored with a Truncation Mooring System

Authors
Park, ByeongwonJung, SungjunSeo, Min-GukKim, JinhaSung, Hong GunPark, Jong-Chun
Issue Date
10월-2023
Publisher
Multidisciplinary Digital Publishing Institute (MDPI)
Keywords
low-frequency motion; model test; mooring system; semi-submersible; truncated mooring
Citation
Journal of Marine Science and Engineering, v.11, no.10, pp 1842
Journal Title
Journal of Marine Science and Engineering
Volume
11
Number
10
Start Page
1842
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/9747
DOI
10.3390/jmse11101842
ISSN
2077-1312
2077-1312
Abstract
In this study, a model test was carried out to evaluate the station-keeping performance of Korea Research Institute of the Ships and Ocean Engineering (KRISO) standard semi-submersible, K-Semi in the Deep Ocean Engineering Basin (DOEB). The test was performed using a 1/50 scaled model with 12 mooring lines. The water depth was set to 3.2 m using a moveable bottom structure and truncated mooring lines. The dynamic behavior of the K-Semi was examined using a free decay test and regular wave as well as irregular wave tests of 1800. Large surge, heave and pitch due to drift motion from second-order effect were observed. The reason for the excessive low-frequency pitch motion is attributed to the restoring force and moment related to the mooring system as excessive surge occurred. The numerical model of K-Semi with the truncated mooring system was tuned and calibrated using model test results such as free decay and regular wave tests. Through numerical analysis, the motion characteristics of the K-Semi were compared with irregular model test results. In the case of a semi-submersible using a mooring system, it is observed that excessive pitch motion due to vertical restoring force and moment may occur when large horizontal displacement occurs. The effect of low-frequency pitch motion related to surge motion is an important factor in upwell estimation as well as second-order motion in referred DNV-GL OTG13.
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친환경해양개발연구본부 (심해공학연구센터)
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