• Title/Summary/Keyword: 주묘

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주묘 사례를 통한 AC-14형과 ASS형 앵커의 파주계수 비교에 관한 연구

  • Gong, Gil-Yeong;Lee, Yun-Seok;Jeong, Chang-Hyeon;Kim, Jong-Seong
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2011.06a
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    • pp.340-342
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    • 2011
  • 묘박 중인 선박은 주묘를 예방하기 위해서는 파주력을 크게 유지해야 하는데, 대부분의 파주력은 앵커에 의해 형성된다. 앵커의 파주력은 앵커의 형태와 수중무게 그리고 해저 저질에 따른 파주계수에 따라 달라진다. AC-14형 앵커는 ASS형 앵커에 비하여 2~2.5배의 파주력을 형성하는 것으로 알려져 있다. 그러나 이러한 파주계수는 모형실험 등을 통하여 정해진 것으로 실제 상황에서 그 유효성을 분석한 연구는 거의 없다. 따라서 본 논문에서는 AC-14형 및 ASS형 앵커의 파주계수를 실제 선박에서의 주묘 사례를 분석하여, 현재 사용되고 있는 파주계수의 유효성을 확인하였다.

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A Study for the Evaluation of the Force by the Wind on the Ship at Anchoring (실선계측을 통한 묘박중인 선박의 풍압력 적용에 관한 연구)

  • Jung, Chang-Hyun;Kong, Gil-Yong
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.15 no.3
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    • pp.223-228
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    • 2009
  • By the typhoon "MAEMI" in 2003, a lot of marine accidents such as stranding, collision etc. occurred to the vessels at anchor in "JINHAE MAN" which was considered one of the most safe sheltering anchorage in Korea. These accidents resulted from the dragging of anchor by the strong winds. It needs to compare the external forces with the holding powers of anchors to estimate if the anchor will be dragged or not. However, the calculation of the force by the wind on the ship, in particular, on the wind pressure area which changes by the swinging of her bow is not yet set on a thesis. Therefore, this paper verified that how many times the front wind pressure area should be applied to calculate the force by the wind on the ship at anchor by comparing and analyzing the numerical calculation with, the actual ship's data which was really dragged by the strong wind.

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A Study on the Anchoring Safety Assessment of E-Group Anchorage in Ulsan Port (울산항 E 집단정박지 묘박안전성 평가에 관한 연구)

  • Lee, Yun-Sok
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.20 no.2
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    • pp.172-178
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    • 2014
  • This study suggests the minimum critical external forces based on the assessment of anchoring safety to single anchor situation for representative 8 number of ships in E-group anchorage of Ulsan port. Assessment of anchoring safety is compared holding powers of anchor with external forces of wind, wave and current. Holding powers was reflected materials of seabed, equipment numbers regarding anchor and chain weight, also external forces acting on a hull was calculated considering projected wind area and wetted surface area to the full and ballast conditions respectively. The results of anchoring safety assessments to single anchor showed that the minimum criteria of dragging anchor is a little different from ship's type, size and loading conditions. Bulk carrier can be dragged over the 15m/s of winds and Tanker can be dragged over the 13m/s of winds in case of less than 2knots of currents speed.

A Study on the Estimation of Center of Turning Circle of Anchoring Vessel using Automatic Identification System Data in VTS (VTS에서 AIS데이터를 활용한 정박선의 선회중심 추정에 관한 연구)

  • Kim, Kwang-Il;Jeong, Jung Sik;Park, Gyei-Kark
    • Journal of Navigation and Port Research
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    • v.37 no.4
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    • pp.337-343
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    • 2013
  • To ensure the safety for vessels anchored in stormy weather, duty officer and VTS operator have to frequently check whether their anchors are dragging. To judge dragging of the anchored vessel, it is important for VTS operator to recognize the turning circle and its center of the anchored vessel. The judgement for the anchored vessel dragging can be made by using Radar and AIS. If it is available, CCTV or eye-sighting can be used to know the center of turing circle. However, the VTS system collects individual ship's dynamic information from AIS and ARPA radar and monitors of the anchored vessels, it is difficult for VTS operator not only to get the detailed status information of the vessels, but also to know the center of turning circle. In this study, we propose an efficient algorithm to estimate the center of turning circle of anchored vessel by using the ship's heading and position data, which were from AIS. To verify the effectiveness of the proposed algorithm, the experimental study was made for the anchored vessel under real environments.

Study on Improvement of Anchorage Management in Pohang Port (포항항 정박지 개선방안에 관한 연구)

  • Kim, Jeong-Rok;Gug, Seung-Gi
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2014.10a
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    • pp.5-6
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    • 2014
  • Pohang port have specified 19 anchorage and 3 quarantine anchorage, but this anchorage is insufficient required anchorage because the average daily use of more than 40 vessels, also Pohang anchorage have geographical characteristics that are open to offshore northeast direction. Recently, sinking ship accident was caused at Pohang port anchorage by dredging anchor due to strong wind from north or north-east. ${\cdots}$ (중략) ${\cdots}$.

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Determining Input Values for Dragging Anchor Assessments Using Regression Analysis (회귀분석을 이용한 주묘 위험성 평가 입력요소 결정에 관한 연구)

  • Kang, Byung-Sun;Jung, Chang-Hyun
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.27 no.6
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    • pp.822-831
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    • 2021
  • Although programs have been developed to evaluate the risk of dragging anchors, it is practically difficult for VTS(vessel traffic service) operators to calculate and evaluate these risks by obtaining input factors from anchored ships. Therefore, in this study, the gross tonnage (GT) that could be easily obtained from the ship by the VTS operators was set as an independent variable, and linear and nonlinear regression analyses were performed using the input factors as the dependent variables. From comparing the fit of the polynomial model (linear) and power series model (nonlinear), the power series model was evaluated to be more suitable for all input factors in the case of container ships and bulk carriers. However, in the case of tanker ships, the power supply model was suitable for the LBP(length between perpendiculars), width, and draft, and the polynomial model was evaluated to be more suitable for the front wind pressure area, weight of the anchor, equipment number, and height of the hawse pipe from the bottom of the ship. In addition, all other dependent variables, except for the front wind pressure area factor of the tanker ship, showed high degrees of fit with a coefficient of determination (R-squared value) of 0.7 or more. Therefore, among the input factors of the dragging anchor risk assessment program, all factors except the external force, seabed quality, water depth, and amount of anchor chain let out are automatically applied by the regression analysis model formula when only the GT of the ship is provided.

A Study on the Limit of Anchor Dragging for Ship at Anchor( I ) (묘박 중인 선박의 주묘 한계에 관한 연구( I ))

  • Lee, Yun-Sok;Jung, Yun-Chul;Kim, Se-Won;Yun, Jong-Hwui;Bae, Suk-Han;Nguyen, Phung-Hung
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.29 no.1
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    • pp.165-171
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    • 2005
  • When typhoon approaches, ship normally drops her anchor at proper anchorage for sheltering. If an anchoring ship is under the influence of typhoon, she can keep her position when the external force and counter force is balanced. Where, external force is induced by wind, wave and tidal currents while counter force is induced by holding power of anchor/chain and thrust force of main engine. In this study, authors presented a method to analyze theoretically the limit of external force for the ship to keep her position without being dragged and, to check the validity of method, applied this to the ship which had been anchored in Jinhae Bay when the typhoon MAEMI passed on September 2003.

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A Study on the Limit of Anchor Dragging for Ship at Anchor( I ) (묘박 중인 선박의 주묘 한계에 관한 연구( I ))

  • Lee Yun-Sok;Jung Yun-Chul;Kim Se-Won;Yun Jong-Hwui;Bae Suk-Han;Nguyen Phung-Hung
    • Journal of Navigation and Port Research
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    • v.29 no.5 s.101
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    • pp.357-363
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    • 2005
  • When typhoon approaches, ship normally drops her anchor at proper anchorage for sheltering. If an anchored ship is under the influence of typhoon, she can keep her position when the external force and counter force is balanced. Where, external force is induced by wind, wave and tidal currents while counter force is induced by holding power of anchor/chain and thrust force of main engine. In this study, authors presented a method to analyze theoretically the limit of external force for the ship to keep her position without being dragged and, to check the validity of the method, applied this to the ship which had been anchored in Jinhae Bay when the typhoon MAEMI passed on September 2003.

Study on Anchored Safety Improvements for Open Sea Anchorage - Focused on Pohang Port (외해 개방형 정박지의 안전성 향상에 관한 연구 - 포항항 중심으로)

  • Kim, Jeong-Rok;Gug, Seung-Gi
    • Journal of Navigation and Port Research
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    • v.39 no.3
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    • pp.233-239
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    • 2015
  • Recently, Due to variable marine accident occurred, problems relating to marine accidents have been raised. Of these accidents, designated anchorage of Korea coastal port, spcially open-sea anchorage, occurred dragging anchor and accidents are likely, due to failure to obtain a valid ship's holding power so that it is the situation unsatisfactory that ensuring the safety of the anchored ship and anchorage systematic safety management stadars for the efficent operation of the anchorage. also in case of open-sea anchorage vulnerable to external force of certain conditions due to geographical location and topographical characteristics of the port, accidents are likely dragging anchor by typoon or suddenly strong wind and secondary accidents are concerned. This paper shows standard of limit external force to ensure the safety anchorage each of ship's size through review marine accidents on Pohang port, also it is determined to be used as a basic reference for anchoring safety and efficient anchorage management.

항만 내 돌풍현상에 따른 VTS의 대처 방안 제안

  • Kim, Bo-Gyeom;Park, Chan-Gil;Yun, Tae-Sin
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2016.05a
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    • pp.329-331
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    • 2016
  • 항만 내 돌풍 현상은 사전 예측이 어렵기 때문에 발생할 경우 해양사고로 이어질 가능성이 높으므로, 포항항의 실제 사례 분석을 통한 돌풍의 특징 위험성 및 VTS 대응 방안 제안.

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