• Title/Summary/Keyword: Sea Trials

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Development of Motion Control Techniques and Sea Trials of The Test Ship $\ulcorner$NARAE$\lrcorner$ (시험선 $\ulcorner$나래$\lrcorner$의 자세 제어 기술 개발 및 실해역 시험)

  • J.W. Kim;Y.G. Kim;G.J. Lee;C.Y. Lee
    • Journal of the Society of Naval Architects of Korea
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    • v.35 no.3
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    • pp.26-37
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    • 1998
  • In this study, the motion control techniques allied to the test ship NARAE are summarized and the results of sea trials are resented. NARAE adopted a hybrid hull form with lower hull and submerged foils. This type of ship has a substantial instability in heave, pitch and roll modes at the foil-borne stage due to little restoring force, so an active control is indispensable to keep the stability. 4-hydraulic actuators with servo valves were installed to drive foils, and several sensors were used to measure the motion of the ship. PID controller was adopted as a motion controller, and for the real-time control, Pentium-class industrial PC was used. Sea trials including take-off, landing, and banked turn maneuvering were carried out for a period of over 3 months and quite satisfactory results were obtained.

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Measurement of Sea Ice Thickness in the Arctic Ocean Using an Electromagnetic Induction Instrument (전자기 유도 장비를 이용한 북극해 해빙의 두께측정)

  • Jeong, Seong-Yeob;Lee, Chun-Ju
    • Journal of the Society of Naval Architects of Korea
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    • v.49 no.2
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    • pp.189-195
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    • 2012
  • The ice trials of the first Korean icebreaking research vessel "ARAON" were performed at the Arctic Ocean in July-August 2010. The sea ice concentrations of Arctic Ocean were 4/10 to 10/10 and the range of sea ice thickness was roughly 1.0 to 3.5m. In this research, sea ice thickness characteristics at the old ice floes were determined from results of drill hole and apparent conductivity measurements. Especially we measured apparent conductivity using an electromagnetic induction instrument (EM31-MK2) and estimated the sea ice thickness through the empirical equation from Cold Regions Research & Engineering Laboratory, CRREL. The results of estimated sea ice thickness were compared to drill hole measurement results and then, we suggest the new empirical equation to estimate sea ice thickness of single layer type sea ice during the summer season of Arctic Ocean by curve fitting approach to these data.

A Study on the Guidelines for IMO Maritime Autonomous Surface Ships(MASS) (IMO 자율운항선박 가이드라인 분석에 관한 연구)

  • Park, Han-Seon;Cha, Chong-ju;Jo, Min-chul
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2019.11a
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    • pp.137-138
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    • 2019
  • The International Maritime Organization (IMO) adopted the Circular 101 (MSC / Circ. 1604) as an interim guidelines for MASS trials at the 101st Maritime Safety Committee. This guideline will be used as a guideline for the sea trials of Maritime Autonomous Surface Ships(MASS) in the future and will be used by government authorities and stake-holders to secure infrastructure for MASS safety, environmental protection and remote operation. The purpose of this study is to analyze the Interim Guidelines for MASS Trials adopted by IMO and to clearly classify the responsibilities and obligations of governments of stake-holders, and to present the main points of risk management necessary for maritime test operation from the perspective of human factors.

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Development of Safety Management Procedures for an Autonomous Navigation Element Technology Test (선박 자율운항 요소기술 시험을 위한 안전관리절차서 개발)

  • Woo, Donghan;Lee, In-Gyu;Im, Namkyun
    • 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.

A Study of ISO6954:2000(E) in Containership (컨테이너선박에 대한 ISO6954;2000(E) 적용사례)

  • Kim, Byoung-Ook;Choi, Su-Hyun;Jin, Bong-Man
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.705-708
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    • 2004
  • The vibration guideline of ISO 6954, which has been applied for evaluation of vibration status in accommodation area of ships had been revised. In this paper, the application results of ISO 6954:1984 and ISO 6954:2000(E) are compared based on the measured results on sea trials.

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Clinical Study on Skin Improvement Effect in Adult Women of Age 40 to 50 Using Cosmetics Containing Sea Cucumber Extract

  • Kim, Yong-shin;Moon, Ji-sun
    • Journal of the Korean Applied Science and Technology
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    • v.36 no.1
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    • pp.113-124
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    • 2019
  • The purpose of the study was to investigate the effects of sea cucumber extract on skin as a natural cosmetics functional material. Subjective evaluation of cosmetics before and after were conducted with questionnaires regarding moisture content, sebum content, melanin index, and erythema index. Experiments were conducted on improvement efficacy using skin clinical trials and questionnaires to evaluate changes in perception of skin condition and efficiency of products. With the aim of minimizing skin irritation, the efficiency of the solvent used for extraction was an important factor, and the sea cucumber extract was harvested with efficient extraction conditions at a ratio of 1:10 of 50% ethanol. The study aimed to identify the suitability of sea cucumber extract as a functional cosmetics material to improve the moisturizing ability of skin and its effect on the skin by adding marine natural animal sea cucumber extract. Clinical studies on cosmetics skin containing sea cucumber extract, excellent skin improvement effect from all items of clinical experiment in experimental and control groups. Sea cucumber extract was proved to be a stable, non-adverse physiologically active substance against abnormal symptoms or side effects of skin reactions and skin problems. In addition, the study found excellent results that can lead to its use as a cosmetics material. This is expected to contribute to the development of various cosmetics industries.

Model-Ship Correlation Study on the Powering Performance for a Large Container Carrier

  • Hwangbo, S.M.;Go, S.C.
    • Journal of Ship and Ocean Technology
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    • v.5 no.4
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    • pp.44-50
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    • 2001
  • Large container carriers are suffering from lack of knowledge on reliable correlation allowances between model tests and full-scale trials, especially at fully loaded condition, Careful full-scale sea trial with a full loading of containers both in holds and on decks was carried out to clarify it. Model test results were analyzed by different methods but with the same measuring data to figure out appropriated correlations factors for each analysis methods, Even if it is no doubt that model test technique is one of the most reliable tool to predict full scale powering performance, its assumptions and simplifications which have been applied on the course of data manipulation and analysis need a feedback from sea trial data for a fine tuning, so called correlation factor. It can be stated that the best correlation allowances at fully loaded condition for both 2-dimensional and 3-dimensional analysis methods are fecund through the careful sea trial results and relevant study on the large size container carriers.

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Development of a Trawl Escapement Net using net material (망지를 이용한 트롤 탈출장치 개발)

  • Cho, Sam-Kwang;Shin, Jong-Keun;Cha, Bong-Jin;Yang, Yong-Su
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.44 no.3
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    • pp.165-173
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    • 2008
  • Sea experiment for this study was carried out to develop a Trawl Escapement Net(TEN) using net material to improve the survival rate of undersized fishes that escaped from trawls in the Korean southern sea in May and November, 2005. Three kinds of Trawl Escapement Net(TEN) were examined to increase the escapement rate for fishes escaped from the TEN, and total catches in the codend and cover-net were investigated. The main catch species in the experimental fishing trials using a V shape TEN(A type) in May were Korean pomfret(Pampus echinogaster), slimy(Leiognathus nuchalis), gizzard shad(Konosirus punctatus), white croaker(Pennahia argentata) and smelt(Sillago sihama). In the experimental fishing trials using a V shape TEN with a protector for undersized fishes(B type) and a panel shape TEN with a protector(C type) in November, the main catch species were horse mackerel(Trachurus japonicus), sea pike (Sphyraena japonica), large-head hairtail(Trichiurus lepturus), kammal thryssa(Thryssa kammalensis), white croaker(Pennahia argentata), butterfish(Psenopsis anomala) and red gurnard(Lepidotrigla microptera). Most of large-sized fish species like Korean pomfret and Spanish mackerel could not escape through the TEN in the B type and C type. Catches of horse mackerel were highest in the experimental fishing of November and escapement rates for most fish species including horse mackerel were higher in the C type compared with B type.

A Study of Propeller Thrust in Dock Trials (도크내 시운전시 프로펠러 추력에 대한 연구)

  • K.N. Chung;J.C. Won;H.W. Seo;G.I. Choi
    • Journal of the Society of Naval Architects of Korea
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    • v.36 no.1
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    • pp.53-60
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    • 1999
  • Prior to sea trials, dock trials are usually carried out in order to check the main propulsion system and auxiliaries. At that time the motion of a ship is limited by mooring ropes. In Hyundai Heavy Industries, a simple equation is used to obtain propeller thrust which is used as an input data of mooring analysis. Recently the ship size and the engine power become larger. Therefore a careful analysis of the mooring condition is necessary in order to avoid possible accidents. In this study propeller thrust at deck trials is reviewed and examined through a series of model tests.

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A Study on the Speed Sea Trial on the Ice Field for Ice Breaking Research Vessel "Araon" (쇄빙연구선 "Araon"호를 활용한 빙해역 속력 시운전에 관한 연구)

  • Kim, Hyun-Soo;Lee, Chun-Ju;Jeong, Seong-Yeob;Choi, Kyung-Sik
    • Journal of the Society of Naval Architects of Korea
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    • v.48 no.5
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    • pp.421-425
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    • 2011
  • To know the speed performance of "ARAON" in Arctic ice field, the measurement of ice properties which is ice thickness & strength, snow depth and free board were performed on July 2010. The measuring method of nautical signals such as heading angle, power of engine, wind & current information etc. was described in this paper. The speed sea trials in ice were performed on the four different positions with different ice properties and engine powers because the uniform level ice is not detected in the Chukchi Sea. The test field was partially constrained ice floe with hummocks and it was superposed with small broken ice pieces each other. All of the measured ice properties were compared and evaluated according to the results of sea trial. The relations between speed, ice thickness, strength and power were summarized. Consequently according to the sea trial results, the speed of ARAON is 2.78knots at the 2.49m ice thickness with 6.55MW engine power.