• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2019.05a
• /
• pp.135-137
• /
• 2019

In recent years, the need for ship-to-ship has emerged around the world as the volume of tanker carriers increases. In the case of STS mooring, a safety review should be carried out on other standards since the characteristics are different from the mooring at a typical wharf. However, there is no separate standard about STS in Korea. Therefore, in this study, STS mooring simulation and sensitivity analysis were performed using OPTIMOOR program, a commercial numerical analysis program, to identify STS mooring characteristics. The target sea area is modeled at D2 anchorage of Yeosu Port in Korea, and modeling of the target ship is selected as the case of VLCC-VLCC. Based on this, we tried to establish the standard for STS mooring safety evaluation. Numerical simulation results show that the STS mooring changes depending on the ship load condition, weather condition(wave period and wave height), encounter angle and pre-tension of mooring line. In addition, a risk matrix was created to set the safe external force range in the sea area. It is expected that the mooring characteristics of the STS can be grasped by this result and contribute to the revision of the mooring safety assessment standard.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.29 no.2
• /
• pp.248-253
• /
• 2023

Most offshore platforms utilize chain mooring systems for position keeping. However, information regarding related design modification processes is scarce in literature. This study focuses on the floating liquefied natural gas (LNG) bunkering terminal (FLBT) as the target of shore platform and analyzes the corresponding initial mooring design and model tests via numerical simulations. Subsequently, based on the modified design conditions, a new mooring system design is proposed. Adjusting the main direction of the mooring line bundle according to the dominant environmental direction is found to significantly reduce the mooring design load. Even turret-moored offshore platforms are exposed to beam sea conditions, leading to high mooring tension due to motions in beam sea conditions. Collinear environmental conditions cannot be considered as design conditions. Mooring design loads occur under complex conditions of wind, waves, and currents in different environmental directions. Therefore, it is essential appropriately assign the roll damping coefficients during mooring analysis because the roll has a significant effect on mooring tension.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2011.06a
• /
• pp.272-274
• /
• 2011

부표류 계류장치(쇠사슬)의 관리 운영상 문제점을 해소하고, 범정부적인 저탄소 녹색성장(GREEN PORT) 정책에 부응하며, 현재 중소기업청 구매조건부 신제품개발 사업으로 고기능성 슈퍼섬유을 이용한 계류시설 로프 연구개발 수행중에 있다.

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
• /
• 2002.10a
• /
• pp.124-128
• /
• 2002

본 논문에서는 FPSO 측면에 나란히 연결된 작업선에 대한 계류계 해석이 수행되었다. FPSO 측면에 연결된 작업선의 횡동요에 의한 충돌 가능성, 작업선의 연결선 및 펜더의 파손 가능성 등에 대한 검토가 이루어졌다. 다물체 계류계 해석을 위하여 MOSES 프로그램을 사용하였고, FPSO와 작업선과의 유체역학적 상호작용은 무시하였다.

• Journal of Korean Society of Forest Science
• /
• v.101 no.1
• /
• pp.113-120
• /
• 2012

The purpose of this study was to find out the effect of a torrent control structure using customized tetrapods on the forest water quality, fishes, snials and streamwater ecology conservation and management. The study was conducted in the Honggye valley located in Sanchung-gun, Gyungsangnam-do, and stream water quality and streamwater ecology was compared before and during 2 years after construction of torrent control structure. After construction of the torrent control structure using customized tetrapods, pH of stream water didn't get out of the range of River water quality standard class I. After 2 years construction of the torrent control structure using customized tetrapods, Dissolved Oxygen concentration didn't change, and Electrical Conductivity measurements agreed well within the range of normal clean stream water quality. After construction of the torrent control structure using customized tetrapods, fishes and snials up and down stream movement didn't influence of the tetrapods dam. Stream water quality during 2 years after construction of the torrent control structure was similar to before construction. Therefore, it was find out that the torrent control structure didn't affect stream water quality and ecology.

• Journal of Navigation and Port Research
• /
• v.29 no.8 s.104
• /
• pp.661-666
• /
• 2005

Recent warnings indicate that there is a potential risk of massive earthquake. These earthquakes could produce large-scale tsunamis. Consideration of the effect of Tsunami to the moored ship is very important bemuse it brings the loss of life and vast property damage in a viewpoint of ship operations within a harbor. If a tsunami occurs, a ship in a harbor may begin drifting in case of ship entering and departing harbor, and breakage of mooring rope and drifting of moored ship are happened. And extremely serious accident, such as stranding and collision to a quay, might occur. On the other hand, since the tsunami consists of approximately component waves of several minutes, there is a possibility of resonance with the long period motion of mooring vessel. As the speed of Tsunami is much faster than tidal current in a harbor, a strong resisting force might act on the moored ships. In this paper, the numerical simulation procedure in the matter of ship motions due to the attack of large-scale tsunamis are investigated and the effects on the ship motions and mooring loads are evaluated by numerical simulation.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.21 no.9
• /
• pp.569-574
• /
• 2020

A floating dock is the main facility for launching ships. In the early 2000s, ship-launching technology using floating docks was developed in Korea. Therefore, the opportunity to participate in new construction projects without investment in dry docks has expanded. In this paper, a basic calculation for the safe mooring of a floating dock was performed, and a mooring system was designed based on this. This study was conducted considering the typhoon situation, which is the most serious environmental requirements of Daebul Pier, a site to be installed and operated, for a floating dock. The design load was calculated by wind load, tidal load, and wave-induced load in accordance with the internationally accepted standards. After performing the initial arrangement of the mooring line of the floating dock using the existing mooring facilities of Daebul Pier, the minimum breaking load for each mooring line was calculated for the given load. Based on the calculation, the mooring arrangement was modified to minimize the breaking load, and a final specification of each mooring line was selected.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2006.06b
• /
• pp.191-197
• /
• 2006

Recently, the earth scale disaster is occurring frequently. Under the effects of global warming, the weather has become unseasonable worldwide. Hence, the earth is experiencing unstable condition with many disasters such as storms and flood damages as well as earthquake. Therefore, it is necessary to consider what we can do to prevent disasters. A disaster like earthquake will inevitably occur in view of the probabilities. The active period of earthquakes and the inactive periods repeat alternatively. Consequently, recent warnings indicate that there is a potential risk of massive earthquakes. Consideration of the effects of tsunami to the moored ship is very important. Operational problems such as moored ship motions sometimes become remarkable with large amplitude and long periods in harbor. Moored ship motions may cause the breakage of mooring systems such as mooring lines, fenders or quay. Large and long period moored ship motions are caused by resonant effects. In this paper, the moored ship motions within a harbor by the large-scale tsunami and the effects on the motions and mooring loads with resonant effects are investigated by numerical simulations.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.28 no.5
• /
• pp.819-826
• /
• 2022

Recently, interest in smart port systems for linking with autonomous ships is increasing. To build a smart port system, primarily, a system that can automatically moor a vessel is required. To calculate the allowable mooring capacity of the automatic mooring system in a port, the characteristics of the vessel must be considered, and the external force generated from environmental disturbances in the sea must be accurately calculated. Accurately estimating the magnitude of these environmental disturbances is an extremely important factor for designing an automatic mooring system. In this study, the mooring capacity of the HANBADA was estimated according to the port and fishing port design criteria of the Ministry of Ocean and Fisheries. The longitudinal and lateral forces of the mooring force acting on the HANBADA were 18 kN and 248 kN, respectively, under the most extreme ocean conditions (BF 6).

• Proceedings of KOSOMES biannual meeting
• /
• 2017.04a
• /
• pp.49-50
• /
• 2017