Kyungsik Choi

Korea Maritime and Ocean University

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Seong-Yeob Jeong

Korea Maritime and Ocean University

Chun-Ju Lee

Korea Research Institute of Ships and Ocean Engineering

Jong-Ho Nam

Korea Maritime and Ocean University

Tak-Kee Lee

Gyeongsang National University

Eun-Jee Cheon

Pohang University of Science and Technology

Kuk-Jin Kang

Korea Research Institute of Ships and Ocean Engineering

Seong-Rak Cho

Korea Research Institute of Ships and Ocean Engineering

Jong‐Hyun Lee

Seoul National University of Science and Technology

Hyunsoo Kim

Seoul National University

Ho Jin Lee

Korea Maritime and Ocean University

Cooperative Institutions

Korea Maritime and Ocean University

Gyeongsang National University

Seoul National University

Korea Research Institute of Ships and Ocean Engineering

Korea Institute of Ocean Science and Technology

Korea Institute of Machinery and Materials

Pusan National University

Yonsei University

Korea Maritime Institute

Hanyang University

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Simulation of optimal arctic routes using a numerical sea ice model based on an ice-coupled ocean circulation method

International Journal of Naval Architecture and Ocean Engineering (2013)

Jong-Ho Nam Inha Park Ho Jin Lee Mi Ok Kwon Kyungsik Choi

Ever since the Arctic region has opened its mysterious passage to mankind, continuous attempts to take advantage of its fastest route across the region has been made. The Arctic region is still covered by thick ice and thus finding a feasible navigating route is essential for an economical voyage. To find the optimal route, it is necessary to establish an efficient transit model that enables us to simulate every possible route in advance. In this work, an enhanced algorithm to determine the optimal route in the Arctic region is introduced. A transit model based on the simulated sea ice and environmental data numerically modeled in the Arctic is developed. By integrating the simulated data into a transit model, further applications such as route simulation, cost estimation or hindcast can be easily performed. An interactive simulation system that determines the optimal Arctic route using the transit model is developed. The simulation of optimal routes is carried out and the validity of the results is discussed.

Hindcast

Transit time

10.3744/jnaoe.2013.5.2.210

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Citations (4)

Significance of Modern Analog Studies for Exploration and Development of Oil Sand

Kyungsik Choi

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Study on Influence of Ship Speed on Local Ice Loads on Bow of the IBRV ARAON

Journal of Advanced Research in Ocean Engineering (2015)

Tae-Wook Kim Kyungsik Choi Jong‐Hyun Lee Tak-Kee Lee

This study presents the analysis of relationship between ship speed and local ice load on the Korean Icebreaker ARAON. The relationship curves were made from the data obtained at two areas: the Arctic and the Antarctic; and for two operation condition: the icebreaking condition in sea ice trial and general operation in ice covered sea. The strain data were converted to the equivalent stress value, and the influence of ship speed on the local ice load was analyzed and compared each other. These analysis results are useful in working on a statistically valid hull design approach.

Sea trial

10.5574/jaroe.2015.1.1.025

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Comparison of the 6-DOF Motion Sensor and Stain Gauge Data for Ice Load Estimation on IBRV ARAON

Journal of the Society of Naval Architects of Korea (2016)

Jung Ki Min Eun-Jee Cheon Jin Myung Kim Sang Chul Lee Kyungsik Choi

This study focuses on the comparison of measured data from 6-DOF motion sensor and strain gauge installed in the IBRV ARAON during 2015 summer voyage in the Arctic. Procedures to calculate the global ice load from MotionPak II inertial measurement system and the local load from stain gauge system are discussed. The ship's speed and peak load are determined in the concept of an ice collision "event". It is found that the peak values in the global ice calculated form whole ship motion analysis fall in the range of 1.5~3 times of the local ice load based in strain gauge measurement.

Strain gauge

10.3744/snak.2016.53.6.529

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Citations (8)

A three-dimensional constitutive damage model for polycrystalline ice

Mechanics of Materials (1989)

Dale G. Karr Kyungsik Choi

Damage mechanics

10.1016/0167-6636(89)90005-7

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Citations (45)

2010 Arctic Voyage of the Icebreaking Research Vessel 'Araon' and Material Properties of Arctic Sea Ice

Proceedings of the International Conference on Port and Ocean Engineering Under Arctic Conditions (2011)

Kyungsik Choi Youngjin Park Daehwan Kim Jong-Ho Nam

The first Korean-made icebreaking research vessel 'ARAON' had her second sea ice trial in the Arctic Ocean during the summer season of 2010. This paper describes the test procedures to obtain sea ice data which provides basic information to ship's performance in ice-covered sea and estimate the correct ice load/resistance on the IBRV ARAON. The data gathered from sea ice in Chukchi Sea and Beaufort Sea during the Arctic voyage of ARAON includes ice thickness, temperature, density and salinity of sea ice as well as ice strength data. This paper analyses the gathered Arctic sea ice data compared to those from the first voyage of ARAON during her Antarctic Sea ice trial.

Beaufort sea

Fast ice

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Study on icebreaking performance of the Korea icebreaker ARAON in the arctic sea

International Journal of Naval Architecture and Ocean Engineering (2011)

Hyunsoo Kim Chun-Ju Lee Kyungsik Choi Moon-Chan Kim

A full-scale field trial in ice-covered sea is one of the most important tasks in the design of icebreaking ships. The first Korean icebreaking research vessel ‘ARAON’, after her delivery in late 2009, had a sea ice field trial in the Arctic Sea during July-August, 2010. This paper describes the test procedures and data analysis on the icebreaking performance of the IBRV ARAON. The data gathered from the icebreaking performance test in the Chukchi Sea and the Beaufort Sea during the Arctic voyage of ARAON includes the speed and engine power of the ship as well as sea ice thickness and strength data. The air temperature, wind speed and heading of the ship were also measured during each sea ice trial. The ARAON was designed to break 1 m thick level ice with a flexural strength of 630kPa at a continuous speed of 3knots. She is registered as a KR POLAR 10 class ship. The principal dimensions of ARAON are 110 m, 19 m and 6.8 m in length, breadth and draft respectively. She is equipped with four 3,500kW diesel-electric main engines and two Azipod type propulsion motors. Four sea ice trials were carried out to understand the relationship between the engine power and the ship speed, given the Arctic ice condition. The analysis shows that the ARAON was able to operate at 1.5knots in a 2.5m thick medium ice floe condition with the engine power of 5MW, and the speed reached 3.1 knots at the same ice floe condition when the power increased to 6.6MW. She showed a good performance of speed in medium ice floe compared to the speed performance in level ice. More detailed analysis is summarized in this paper.

Sea trial

Beaufort sea

Ursus maritimus

Polar night

10.2478/ijnaoe-2013-0064

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Citations (33)

Modification of Local Ice Load Prediction Formula Based on IBRV ARAON’s Arctic Field Data

Journal of Ocean Engineering and Technology (2019)

Sungrok Cho Kyungsik Choi

This paper focuses on a newly designed ice load formula based on the ARAON's 2016 Arctic field data in order to improve a structural design against ice loads. The strain gage signals from ARAON's hull plating were converted to the local ice pressure upon the hull plating using the influence coefficient matrix and finite element analysis. First, a traditional pressure-area relationship is derived by applying probabilistic approaches to handle the strains measured onboard the ARAON. Then, the local ice load prediction formula is re-analyzed after reviewing the ARAON's additional field data to consider information about the ship speed and thickness of the sea ice. It is shown that the newly developed pressure-area relationship well reflects the influence of other design parameters such as the ship speed and ice thickness in the prediction of local ice loads on Arctic vessels.

Strain gauge

10.26748/ksoe.2019.013

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An Algorithm to Estimate the Thickness of Broken Arctic Ice Using an Image

Jong-Ho Nam Inha Park Ho Jin Lee Young Gyo Seo Kyungsik Choi

The thickness of ice is the major factor affecting the rapid and safe cruise of icebreaking vessels. Unfortunately, measuring the ice thickness has been known to be a difficult task. An approach to measure the ice thickness by analyzing the video clips of ice breaking is introduced. From a series of still shots, the broken section of the ice is identified using image processing techniques such as conversion of color space, edge detection, boundary motion, and various digital smoothing filters. The algorithm developed is verified by comparing the results with measured data.

Smoothing

10.5957/icetech-2012-110

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A Semi-Empirical Method of Ice Resistance Prediction in Level Ice

Seong-Yeob Jeong Kyungsik Choi Kuk-Jin Kang Seong-Rak Cho Chun-Ju Lee

We introduce a semi-empirical model that can determine a ship’s performance in level ice based on Lindqvist’s model and develop a simple model for calculating ice resistance. This model assumes that contact between the ship and the ice is a case of symmetrical collision, and two contact cases are considered. Crushing and submersion forces are calculated via Lindqvist’s formulas, and the breaking force is determined by a concept of energy consideration during ship and ice impact. The average difference between the predicted data and the model test data is about 4.6%, but the total resistance showed fairly close agreement with both. In addition, the friction coefficient may have considerable influence on breaking and submersion forces.

Submersion (mathematics)

Lead (geology)

Impact

Contact force

10.5957/icetech-2014-141

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