• Title/Summary/Keyword: Sea Trial

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Study on the Speed-Power Characteristics Through a Speed Trial of a Large Container Vessel During a Commercial Voyage Part I (상업 운항 중인 대형 컨테이너선의 항차 중 속력 시운전을 통한 선속-동력 특성 연구 Part I)

  • Kim, Ho;Lee, Joon-Hyoung;Jang, Jin-Ho;Ahn, Hae-Seong;Kang, Dae-Youl;Byeon, Sang-Su
    • Journal of the Society of Naval Architects of Korea
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    • v.58 no.6
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    • pp.366-374
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    • 2021
  • This paper presents the analysis of the speed-power performance in the real sea using a large container vessel data provided as a test bed from a shipping company. To perform a speed trial of the vessel during a commercial voyage, the on-board measuring device and various operation data acquisition systems were mounted on the vessel for long-term performance monitoring and the voyage operated under the container loading condition close to the design draft was adopted. The content of this paper consists of Part I and Part II. Part I, such as this paper, contains the speed trial method and analysis results of the operating vessel. Part II contains the analysis of the speed-power characteristics change over time and before and after hull cleaning using operation data measured from the voyage operated under a condition similar to the speed trial.

Design of Course Keeping Controller for RIB-type USV Using a Pilot's Steering Pattern (조종자 입력패턴을 활용한 RIB형 무인선의 침로제어기 설계)

  • Yun, Kun-Hang;Yeo, Dong-Jin;Yoon, Hyeon-Kyu
    • Journal of the Society of Naval Architects of Korea
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    • v.47 no.3
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    • pp.462-468
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    • 2010
  • A new course keeping controller for RIB(Rigid Inflatable Boat)-type USV(Unmanned Surface Vehicle) is developed using pilot's steering pattern. A pilot's simple steering pattern is found out from various course change tests. It is used to course keeping algorithm, suitable for large course change more than 60 degrees. To validate the course keeping controller, sea trial tests are conducted. From sea trial test, new course keeping controller shows good performance with less overshoot, maximum roll angle less than $20^{\circ}$, which makes it possible that fast course changes without slip motion of USV.

A Study on the Improvement of Adhesive Mixing Ratio about Acoustic Window for Enhancing SONAR Performance of Submarine (수중함 소나 수신성능 향상을 위한 음향창 접착제 배합비 개선)

  • Ham, Younghoon;Kim, Joonwoo;Chang, Hoseong
    • Journal of the Korea Institute of Military Science and Technology
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    • v.21 no.4
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    • pp.481-488
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    • 2018
  • This study suggest the improvement of the CFRP adhesive mixing ratio about acoustic window to enhance SONAR performance. The CFRP of submarine is produced by allocation an acoustic window zone by the beam width of SONAR sensors. During the sea trial, SONAR system's bearing and range accuracy data is not in tolerance due to debonding phenomenon on CFRP. The inappropriate mixing ratio of adhesives caused that peeling phenomenon occurred in the acoustic window part, which is the reason for the deterioration of SONAR sensors performance. The report includes explanation of test procedure of SONAR, root cause analysis, CFRP manufacturing procedure, laboratory tests results, and proof of the performance at the sea trial.

Maneuverability Analysis of a Ship by System Indentification technique (시스템검증법에 의한 조종성능해석연구)

  • Gang, Chang-Gu;Seo, Sang-Hyeon
    • 한국기계연구소 소보
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    • s.10
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    • pp.35-48
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    • 1983
  • When the hydrodynamic coefficients of the ship maneuvering equation are estimated by captive model test, it is difficult to take account of the scale effect between model and full scale ship. This scale effect problem can be overcome by processing the sea trial data with system identification. Extended Kalman filter is used as a system identification technique for the modification of the simulation equation as well as the estimation of hydrodynamic coefficients. The phenomena of simultaneous drifting of linear coefficients occur. It is confirmed that two coefficients in each pair-($Y_v$', $Y_r$' -m' u'), ($N_v$', $N_r$' )-are simultaneously drifting and all 4 coefficients are simultaneously drifting together. Particularly simultaneous drifting of 2 coefficients in each pair is more significant. It is also shown that the simultaneous drifting of 4 coefficients can be reduced by choosing the input data which have the random v'/r' curve and 4 coefficients are estimated within 2-4% error, which may be noise level. So, it is recommended to operate the rudder randomly in sea trial or model test for the application of system identification technique.

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Study on the ENC Sea Trial Plan (전자해도 실선시험에 관한 연구)

  • 서상현;이희용
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 1998.10a
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    • pp.85-95
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    • 1998
  • ECDIS, highlihgted as a new technology for the navigation safety, could replace the paper charts in the bridge and make the more safe navigation possible. For the marines to use the ECDIS, the infrastructrue of the ENC production and distribution, the development of IMO compliant ECDIS, the training program for the ECDIS usage and related matters are thought as the key points to be solved. Also it is necessary for the ECDIS usage and related maters are thought as the key point to be solved. Also it is necessary for the related groups, such as ECDIS manufactures, users, ENC producers, the to be involved in developing the national infrastructure altogether to promote the ECDIS usage. Upon these background, the Korean ENC pilot project was introduced and the comparison study of the SHARED project coordinated by MPA(Maritime Port Authority, Singapore) and the Canadan Pilot project has been done. With such a analysis, the Korean ENC sea trial test plan is presented.

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Design of 300 Passenger Super High-Speed Foil Catamaran Ships (300인승 초고속 수중익 쌍동여객선의 설계에 대한 연구)

  • Min, Keh-Sik;Kim, Oi-Hyun;Kang, Seon-Hyung
    • Journal of the Society of Naval Architects of Korea
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    • v.34 no.3
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    • pp.85-95
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    • 1997
  • The design work for the next generation of 300 passenger super high - speed foil catamaran ship has been performed in this study utilizing the accumulated technology and the acquired know - how. The study has been so successfully completed that the performance characteristics confirmed by the model tests are much superior to those of the design target. The construction and the sea trial of the super high - speed foil catamaran passenger ship designed in this study has been completed already. It is the authors' plan to present the sea trial results in the near future.

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A Noise Control of a Ro-Ro Passenger Ferry (대형 Ro-Ro Ferry의 방음 설계)

  • 김동해;박종현
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.05a
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    • pp.738-741
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    • 2003
  • In general, the essential requirement for cruisers or car ferries is the reduction in noise to ensure high quality and comfort. Recently, the Ro-Ro Passengers Ferry (ROPAX) was built in Hyundai Heavy Industries. In order to minimize the noise levels, careful attention have to De paid by the special committee of experts from the initial design stage to the sea trial. Proper countermeasures, considering the characteristics of sources and receiver spaces, were applied from the noise prediction and various experiment results. Finally, this ship was successfully delivered with excellent noise properties. This paper describes the procedure of noise analysis, the countermeasures of noise control, and the measurement results of the sea trial. Onboard noise analysis had been carried out by statistical energy analysis program and outdoor noise prediction program based on ISO9614. The prediction results are in good agreements with the measurement results. The technology to minimize the noise levels for cruisers or car ferries has been established throughout the construction of this ship.

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Estimation of Roll Related Coefficients of a Ship by Using the System Identification Method (시스템 식별법을 이용한 선박의 횡동요 계수 추정)

  • 윤현규;손남선
    • Journal of the Society of Naval Architects of Korea
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    • v.41 no.4
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    • pp.53-58
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    • 2004
  • When a fast container ship or a naval vessel is turning, comparable roll motions occur. Therefore, roll effect has to be considered in the horizontal equations of motion of the ship to predict the maneuverability well. In this thesis, a new method to determine a roll model structure and estimate its coefficients by applying the system identification technique to the data of sea trial tests was proposed. The simulation results from the estimated roll model were well consistent with the true one in spite of the difference between the estimated and the true model structures of roll hydrodynamic moment.

A Comparative Analysis of Sea Ice Material Properties in the Amundsen Sea, Antarctica (남극 아문젠해에서 계측된 해빙의 재료특성 비교 분석)

  • Choi, Kyungsik;Kim, Hyun Soo;Ha, Jung Seok;Lee, Chun-Ju
    • Journal of the Society of Naval Architects of Korea
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    • v.51 no.3
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    • pp.254-258
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    • 2014
  • Field trial in ice-covered sea is one of the most important tasks in the design of icebreaking ships. To correctly estimate ice load and ice resistance on ship's hull, It is essential to understand the material properties of sea ice during ice field trials and to perform the proper experimental procedure by gathering sea ice data. A measurement of sea ice properties was conducted during February and March of 2012 with the Korean Icebreaking research vessel "ARAON" in the Amundsen Sea, Antarctica. This paper describes a test procedure to obtain sea ice data which provide basic information to estimate ice loads and icebreaking performance of the ship. The data gathered from sea ice field trials during the 2012 Antarctic voyage of the ARAON includes ice temperature/salinity/density and the compressive/flexural strength of sea ice. This paper analyses the gathered Antarctic sea ice material properties comparing with the previous data obtained during ARAON's Arctic and Antarctic voyages in 2010.