• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.40-40
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• 2017

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2000.06a
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• pp.868-875
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• 2000

이 연구의 목적은 당사에서 제작한 멤브레인형 $130,000M^3$와 $135,000M^3$ LNG 운반선의 진동특성을 파악하고, 거주구역의 진동수준을 예측하기 위함이다. 우선 공진 회피의 관점에서 최적의 프로펠러를 선택하기 위해 간단한 계산을 수행한 후, 주변 해수를 고려한 선박 전체를 모델링하여 3차원 유한요소해석을 수행한다. 이 계산은 보다 정확한 고유진동수를 결정하고, 프로펠러 기진의 주파수 범위에서 관련된 모드 형상을 결정하며, 선박 거주구에서 기대되는 진동수준은 잘 예측할 수 있다. 다음으로 선박이 진수되고 전체구조가 조립된 후 안벽에서 불평형 가진기를 이용해 가진기테스트를 실시하고, 해상시운전 중에도 동일한 방법으로 테스트를 실시한다. 시험은 고유진동수의 항으로 선박의 실제진동응답과 계산결과와의 좋은 비교를 가능하게 한다. 추가적으로 실제 엔진을 구동해 RPM을 최저에서 최고까지 천천히 변경하면서 실제 운항 중 진동응답을 계측함으로서 고유진동수를 예측하여 해석결과 및 가진기 시험결과와 비교한다.

• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.126-126
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• 2017

• Journal of the Korean Institute of Intelligent Systems
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• v.22 no.3
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• pp.379-385
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• 2012

This paper developes the navigation visual aid supporting a watch officer's situation awareness and analyzes its performance test result. Developing the equipment made from composite video sensor which transfer video signal, ranger laser measurement model which search out distance, Pan/ Tilt, center control device. The developed equipment with Pan/Tilt was made from high performance video sensor and ranger laser measurement. To make a real ship test, we carried on setting the developed equipment on ship, observed a danger factor and analyzed a image, and from that we can evaluate marine environment awareness. Through this result, the developed equipment can show effective ability of the awareness of the clearer check and resolution situation when compare with the binocular.

• Journal of Ocean Engineering and Technology
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• v.31 no.5
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• pp.335-339
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• 2017

This study investigated the sea trial performance of a wave piercing high speed planing hull (WPH). The bow shape of the boat is sharp, and it has no chine or spray strip like a normal planing boat. The skeg is attached to the bottom of the boat in the longitudinal direction from the bow to the stern. The speed performance was analyzed as the speed dropped in a wave, and the seakeeping performance was compared with that of a planing boat with a similar velocity coefficient by measuring the vertical acceleration of the bow in the wave. The turning circle was compared with Lewandowski's estimation for a planing boat. As a result of this study, it was confirmed that the velocity drop of the developed WPH was not large in a wave, and the vertical acceleration was greatly reduced compared with that of a normal planing boat. The turning circle was somewhat larger than the estimated results for a planing boat, but the overall tendency was the same.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.05a
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• pp.185-186
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• 2018

에어보트(Air boat)는, 판옥선처럼 선체 밑바닥이 편평한 형태로 되어있어 물위는 물론 일반 선박이 갈 수 없는 얕은 수면, 개펄, 빙상, 늪지수풀 위를 달릴 수 있는 모터보트의 한 종류이다. 선체상부 뒤쪽에 장착된 로터의 회전에 의한 풍력으로 추진되며, 로터 바로 뒤에 방향키가 있다. 선체 재질로는 스틸, FRP가 주로 사용되고 있으며 최근 알루미늄, 탄소섬유의 적용이 늘어나고 있다. 수상크루징, 낚시, 스쿠버 등에 활용되며, 선저의 독특한 형상으로 인해 군사용, 인명구조용, 수산물수송용 등으로도 사용된다. 이 연구에서는 12인승 비미니탑 에어보트를 설계, 제작하고 해상 시운전을 실시하였다. 또한 소음저감을 위해 머플러를 설계 제작하고, 35노트에서 75~78dB 수준으로 성능을 검증하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2019.05a
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• pp.154-155
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• 2019

에어보트(Air boat)는, 선체 상부에 대형 프로펠러를 장착하고 이의 추진력으로 고속 주행하는 특수형태의 선박이다. 선체 밑바닥은 판옥선처럼 평평하고 매끈하기 때문에 장애물에 걸리지 않아 얕은 수면, 개펄, 빙상, 늪지수풀 등 일반선박이 가기 어려운 지역에도 갈 수 있어, 특히 인명구조용으로 많이 이용되고 있다. 그러나 평평한 선저 때문에 파랑이 있거나 측면 바람이 강한 지역에서는, 에어보트는 직진성을 잃어버리고 풍하로 밀리게 되며, 개펄이나 얼음위에서는 정지거리가 길어지는 단점을 가지고 있다. 이 연구에서는 에어보트 선저에 스키드를 장착하여 횡류방지는 물론 직진성을 개선하였으며, 해상 시운전을 통해 성능을 검증하였다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.27 no.5
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• pp.566-573
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• 2021

In this study, safety management procedures were developed based on domestic and foreign guidelines and related maritime law to ensure the safe development and implementation of smart autonomous ship technology and Samsung Heavy Industry. The safety management procedure was developed according to the guidelines for (MASS) sea trials (MSC.1/Circ.1604, Annex: Interim guidelines for MASS trials), proposed by International Maritime Organization (IMO) for the relevant authorities and stakeholders of MASS to properly conduct tests of systems and infrastructure related to safety and environmental protection. The developed safety management procedure applies to the maritime demonstration test of a system applying autonomous navigation element technology mounted as a navigation aid on a ship operating under a watch system, while complying with the environmental protection and navigation safety of the coast of Korea.

• Journal of Advanced Marine Engineering and Technology
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• v.33 no.8
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• pp.1152-1161
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• 2009

The power measurement of main propulsion system on the new vessels can be classified with the direct method acquired from the shaft's strain using strain gauge and the indirect method converted and summed from all of cylinders combustion pressure using mechanical or electrical pickup device during the sea trial. This power is fluctuated by external factors which was influenced by various sea motions with long time interval and by internal factors which was influenced by varying torques of torsional vibration and bending moment, due to mis-aligned shaft and whirling vibration with short time interval. In this paper, the statistical analysis method for the shaft power measurement and assessment using strain gauge in marine vessels are introduced. And these are identified by the low speed two stroke diesel engine model and four stroke medium speed diesel engine model including reduction gear.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.98-99
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• 2016

The aim of study is to develop a dual driven ship berthing/deberthing system with $360^{\circ}$ steerability. A large ship used bow thruster, side thruster and pod propulsor etc. when approaching to a pier. But as marine leisure boats become large-scaled, the number of accidents is recently increasing what caused a ship to crash into a ship and a ship to crash into mooring facilities during berthing/deberthing on a marina. To solve the problem, the control responsiveness of a joystick connected with two motors and a propeller was checked and torque was increased by the electromagnetic design of magnetic gear. A sea trial test was carried out to investigate a performance of the developed system in the real sea.