Investigation of Low-Frequency Pitch Motion Characteristics for KRISO Standard Offshore Structure (KSemi) Moored with a Truncation Mooring System
- Authors
- Park, Byeongwon; Jung, Sungjun; Seo, Min-Guk; Kim, Jinha; Sung, Hong Gun; Park, 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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