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The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Takeshi Terui - One of the best experts on this subject based on the ideXlab platform.

Kyungsik Choi - One of the best experts on this subject based on the ideXlab platform.

  • effects of ship speed and ice thickness on local ice loads measured in arctic sea
    Journal of Ocean Engineering and Technology, 2013
    Co-Authors: Kyungsik Choi
    Abstract:

    The icebreaking Research Vessel ARAON conducted her second ice trial in the Arctic Ocean during the summer season of 2010. During this voyage, the local ice loads acting on the bow of the port side were measured using 14 strain gauges. The measurement was carried out during icebreaking while measuring the thickness of the ice every 10 m. The obtained strain data were converted to the equivalent stress values, and the effects of the ship speed and ice thickness on the ice load were investigated. As a result, it was found that a faster speed produced a larger stress, according to the variation in the peak values below an ice thickness condition of 1.5 m. Meanwhile, the effect of the ice thickness on the ice load was not clear.

  • speed trial analysis of korean ice breaking Research Vessel araon on the big floes
    Journal of The Society of Naval Architects of Korea, 2012
    Co-Authors: Hyunsoo Kim, Chunju Lee, Kyungsik Choi
    Abstract:

    The speed performances of ice sea trial on the Arctic(2010 & 2011) area were shown different results depend on the ice floe size. Penetration phenomena of level ice was not happened on medium ice floe and tore up by the impact force because the mass of medium ice floe is similar to the mass of Araon which is Korean ice breaking Research Vessel and did not shut up by the ice ridge or iceberg. The sea trial on the Amundsen sea was performed at the big floe which is classified by WMO(World Meteorological Organization). Three measurements of ice properties and five results of speed trial were obtained with different ice thicknesses and engine powers. To evaluate speed of level ice trial and model test results at the same ice thickness and engine power, the correction method of HSVA(Hamburg Ship Model Basin) was used. The thickness, snow effect, flexural strength and friction coefficient were corrected to compare the speed of sea trial. The analyzed speed at 1.03m thickness of big floe was 5.85 knots at 10MW power and it`s 6.10 knots at 1.0m ice thickness and the same power. It`s bigger than the results of level ice because big floe was also slightly tore up by the impact force of Vessel based on the observation of recorded video.

  • material properties of arctic sea ice during 2010 arctic voyage of icebreaking Research Vessel araon part 2 compressive strength flexural strength and crystal structures
    Journal of Ocean Engineering and Technology, 2012
    Co-Authors: Youngjin Park, Kyungsik Choi
    Abstract:

    To correctly estimate ice load and ice resistance for a ship`s hull, it is essential to understand the material properties of sea ice during ice field trials and to use the proper experimental procedure for gathering ice strength data. The first Korean-made icebreaking Research Vessel (IBRV), ARAON, had her second sea ice trial in the Arctic Ocean during July and August of 2010. This paper describes the test procedures used to properly obtain sea ice strength data, which provides the basic information on the ship`s performance in an ice-covered sea and can be used to estimate the correct ice load and ice resistance on the IBRV ARAON. The data gathered from three sea ice field trials during the Arctic voyage of the ARAON includes the ice compressive strength, flexural strength, and failure strain of sea ice. This paper analyzes the gathered sea ice data in comparison with data from the first voyage of the ARAON during her Antarctic Sea ice trial in January 2010.

  • a study on the speed sea trial on the ice field for ice breaking Research Vessel araon
    Journal of The Society of Naval Architects of Korea, 2011
    Co-Authors: Hyunsoo Kim, Chunju Lee, Seongyeob Jeong, Kyungsik Choi
    Abstract:

    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.

  • strength characteristics of arctic sea ice from ice field tests of the icebreaking Research Vessel araon
    Journal of The Society of Naval Architects of Korea, 2011
    Co-Authors: Kyungsik Choi, C H Lee, Chaewhan Rim, Hyunsoo Kim
    Abstract:

    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.

Liyanarachchi Waruna Arampath De Silva - One of the best experts on this subject based on the ideXlab platform.

C. J. Lee - One of the best experts on this subject based on the ideXlab platform.

  • Full scale ice sea trials of Korean ice breaking Research Vessel ‘Araon’ on the big floes near Antarctica
    Journal of Marine Science and Technology, 2013
    Co-Authors: H. S. Kim, M. C. Kim, K. S. Choi, C. J. Lee
    Abstract:

    A speed sea trial was performed in the Amundsen Sea in February and March of 2012. The Korean ice breaking Research Vessel “Araon” was used to check speed performance on the big floes. Two of ice trial cases were carried out. We describe the time history of location, the engine power, and the revolutions per minute during the ice trial, and the trajectory of the ship. Additionally, the measured ice properties are considered and discussed. The ice trial results were analyzed according to variation in ice thicknesses, ice strength, propulsion power, and the speed level of the ship. Our analysis results are compared to model test results and ice trial results. A correction to the target ice thickness was used to compare the power and speed relation in the same ice thickness because it is easy to know the relative speed performance of the ship. The Hamburgische Schiffbau-Versuchs Anstalt method was applied for the correction. The speed of Araon in big floes was higher than the speed in level ice. The speed after the correction at 10 MW of power and 103 cm of ice thickness was 5.4 knots based on analysis results.

Jun Inoue - One of the best experts on this subject based on the ideXlab platform.

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