• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.175-176
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• 2018

여름철 북극 해빙 면적의 감소 추세로 빙해선박의 북극항로 통항회수가 증가하고 있어 선박의 안전 항해를 위한 기술 개발에 관심이 집중되고 있다. 본 연구에서는 선박해양플랜트연구소에서 개발 중인 KRISO Arctic Safe Routing System(KARS)의 개념과 함께 핵심 모듈 중 하나인 빙저항 추진 성능 DB 개발 과정을 소개하였다. 우선 빙해수조에서 다양한 빙상환경(평탄빙, 유빙, 빙맥 등)에 따른 선박의 빙성능 평가 시험을 수행한 후 대상선박의 기본적인 빙성능을 도출하였고 빙성능 추정 S/W의 해석결과와 비교 검증을 수행하여 다양한 환경 변수를 고려한 빙저항 추진 성능 DB를 생성하였다. 아울러, 생성된 DB의 검증을 위해 2017년 8월 쇄빙연구선 아라온의 빙해역 실선시험 동안 계측된 결과와 비교 분석하여 정확도를 분석하였고 KARS의 개선 사항 및 향후 활용 가능성을 고찰하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.173-174
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• 2018

온난화 현상으로 북극 해빙 속도가 가속화되면서 북극 운항 선박이 증가하고 있어 선박의 안전 항해를 위한 기술개발이 요구되고 있다. 본 연구에서는 선박해양플랜트연구소에서 개발 중인 KRISO Arctic Safe Routing System(KARS)의 안전 최적항로 계획 방법의 선박실 운항 추진성능 모델 과 선박 고유의 빙 저항 추진 성능 데이터베이스 구성 내용을 소개하였다. 추진성능 모델은 예인 수조시험의 속도-마력 -RPM 성능 데이터와 실 운항에서 조우할 수 있는 바람, 파도 등의 외란에 기인하는 부가저항 및 빙해수조 결과를 바탕으로 다양한 빙상환경에 따른 빙 성능 추정결과를 활용하여 ISO15016: 2002 기반으로 Calm sea 및 빙 해역에서의 선박 속도-마력 성능에서 외란에 의한 부가저항에 따른 소요마력 및 속도변화를 추정하도록 하였다. 제안된 성능모델은 최적 북극항로 탐색 모듈과 결합되어 안전한 북극항로를 도출할 수 있음을 확인하였다.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.126-131
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• 2010

본 논문에서는 극지 빙해역을 운항하는 쇄빙선박이나 해양구조물에 작용하는 해빙의 재료특성을 계측할 수 있는 간이 실험 장비를 제작하였다. 극지 빙해역을 운항하는 쇄빙선박의 빙저항이나 해양구조물에 작용하는 빙하중을 추정하기 위해서 극지 현장에서 실규모의 시험을 수행하게 되는데, 저온과 얼음이라는 악조건을 극복하기 위한 빙역학 기술과 특수 장비가 필요하다. 국내에 한국해양연구원 MOERI 빙해수조가 완공됨에 따라 얼음의 특성을 고려한 모형빙 재료특성 시험용 계측장비가 일부 마련이 되었으나 빙해역 현장 시험에 대한 경험이 전무하며, 계측장비에 대한 지식과 기술 역시 확보되지 못한 실정이다. 본 연구에서는 차후 쇄빙연구선 ARAON호를 이용한 빙해역의 실선계측 시 해빙의 강도를 측정하기 위한 계측시스템 마련의 일환으로 시험편 획득을 위한 코어링 장비와, 해빙의 재료특성 중 1축 압축강도를 측정하기 위한 간이 압축시험기 그리고 얼음의 결정구조를 파악하기 위한 편광기를 제작하였다. 또한 극지 현장실험에 적용할 실험기법 확보를 위한 일련의 과정을 마련하기 위해 제작된 장비를 이용해 소양호에서 현장실험을 수행하였고 계측된 결과를 참고문헌과 비교해본 결과 유사한 값을 갖는 것을 확인할 수 있었다.

• International Journal of Highway Engineering
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• v.3 no.3 s.9
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• pp.111-118
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• 2001

Since the advent of turbojet aircraft with their greater weight and high landing speed breaking performance on runway surface has become un critical. Under certain weather conditions(wet weather, winter) hydroplaning or unacceptable loss of traction can occur, resulting in poor braking performance and possible loss of directional control. To address this concern a number of research project me conducted by NASA, FAA, USAF. The various method which was reported the advantage of the increasing the friction and decreasing the hydroplaning effect. A-2 section of inchon international airport was grooved using drying grooving method. In order to evaluate the effectiveness of the dry grooving method the surface was spray with water and measured the fiction factor and the depth of the water using Mu meter and water depth measuring device. The field test results shooed that the fiction factor nos increased and the depth of the water decreased. The dry grooving method illustrated the reduction of hydroplaning and also, no distress on the runway.

• Bulletin of the Society of Naval Architects of Korea
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• v.45 no.3
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• pp.21-26
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• 2008

• Bulletin of the Society of Naval Architects of Korea
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• v.53 no.2
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• pp.18-22
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• 2016

• Journal of the Society of Naval Architects of Korea
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• v.40 no.6
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• pp.20-29
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• 2003

When Arctic offshore development in the 1970's first led to the consideration of ice capable tankers, there was a high level of uncertainty over design requirements for both safety and ship performance. Also here was a lack of reliable methods to evaluate design proposals. Since that time, improved understanding of the ice environment has raised the confidence of design specifications. Parallel developments have resulted in a suite of engineering tools for ship performance evaluation at the design stage Recent development of offshore and near shore oil and gas reserves in several countries together with economic studies of increased transportation through the Russian Arctic has newly introduced the interest in ice capable tanker design. in response, Samsung Heavy Industries (SHI) applied its experience in tanker design and construction to the design of a specialized tanker with ice capability. SHI produced two prototype hull designs for further study. The performance of both hulls and of the propellers was evaluated at the Institute for Marine Dynamics (IMD) in St. John's, Newfoundland This paper discusses the development of the design, describes the model experiments to determine performance and variations, and presents the results.

• Journal of the Society of Naval Architects of Korea
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• v.48 no.3
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• pp.254-259
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• 2011

The first Korean-made icebreaking research vessel "ARAON" had her second sea ice trial in the Arctic Ocean in Aug. 2010 after her first voyage to Antarctic Ocean in Jan. 2010 to gather various material and strength characteristics of sea ice. This is a detail report of ARAON 2010 summer Arctic voyage and this paper describes a standard test procedure to obtain proper sea ice data which provide basic information to estimate ice loads and icebreaking performance of the ship. The data gathered from sea ice in the Chukchi Sea and Beaufort Sea during the Arctic voyage of the ARAON includes ice temperature/salinity and the compressive/flexural strength of sea ice. This paper analyses the gathered sea ice data in comparison with data from the first voyage of the ARAON during her Antarctic Sea ice trial.

• Journal of the Society of Naval Architects of Korea
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• v.44 no.4
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• pp.389-397
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• 2007

This research describes a framework to compare and analyze the icebreaker(Terry Fox) resistance in pack ice condition between with a refrigerated ice and a synthetic ice. Model tests with a refrigerated ice have been conducted at Institute for Ocean Technology (IOT/NRC) and the tests with a synthetic ice were conducted at Pusan National University towing tank. For the validation of further tests of measurement and accuracy, the open water tests were first carried out with same model ship to compare the test results of both Institutes. Two different size of the wax-type synthetic ice were used and tests were conducted in pack ice of three different concentration ice conditions. The test results show that the difference of resistance between with synthetic and with refrigerated ice becomes larger according to the increase of ship speed. Although the quantity of resistance difference is not so small in high speed range, the present study is predicted to be used as a useful correlation between synthetic and refrigerated ice.

• Journal of the Society of Naval Architects of Korea
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• v.48 no.4
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• pp.363-367
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• 2011

In this paper, friction coefficients between ices and model ship were studied in order to predict the resistance of ice. The friction coefficient is a dimensionless scalar value which describes the ratio of the force of friction between two bodies and the force pressing them together. The coefficient of friction depends on the materials, roughness on surface, lubrication, etc. We tested and analyzed the friction coefficient for the development of the test methodology. The friction coefficient for ice model test is very dominant to predict the ship performance, so every ice tank uses their own painting technique. In this study, the friction coefficient with changing the moving speed of ice was studies by using a flat plates which were made by the MOERI's paining technique and the basic research for the developing the paining methodology in the MOERI ice model basin was carried out.