• 제목/요약/키워드: Ice load under normal operating conditions

검색결과 3건 처리시간 0.086초

정상운항 상태에서 쇄빙선박에 작용하는 설계 빙하중 추정 (Prediction of Design Ice Load on Icebreaking Vessels under Normal Operating Conditions)

  • 최경식;정성엽;남종호
    • 대한조선학회논문집
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    • 제46권6호
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    • pp.603-610
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    • 2009
  • Ice load is one of the important design parameters for the construction of icebreaking vessels. In this paper, the design ice load prediction for the icebreaking vessels under normal operating condition in ice-covered sea is discussed. The ice loads under normal operating condition are expected from sea trials in moderate ice conditions. In this sense the extreme ice loads during heavy ramming or accidental collision are not considered. Current study describes the global ice load on the hull of the icebreaking vessels. Available ice load data from full-scale sea trials are collected and analyzed according to various ship-ice interaction parameters including displacement, stem angle, speed of a ship and flexural strength and thickness of sea ice. The ice load prediction formula is compared with the collected full-scale sea trials data and it shows a good agreement.

쇄빙연구선 ARAON호의 남극해 쇄빙운항 중 계측된 스트레인게이지 데이터 분석 (Analysis of Strain Gauge Data Onboard the IBRV ARAON during Icebreaking Voyage in the Antarctic Sea Ice)

  • 천은지;최경식;김호연;이탁기
    • 대한조선학회논문집
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    • 제51권6호
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    • pp.489-494
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    • 2014
  • Estimation of correct ice load under various operating conditions is important during the design and the operation stages of an icebreaker. Normal operating conditions are expected from the official field ice trials and also from general ice transit action. In this paper ice load for the Korean icebreaking research vessel, ARAON, under normal operating condition, is discussed. Published ice load data from full-scale sea trials of six icebreakers were analysed to derive an empirical ice load prediction formula. The IBRV ARAON had sea ice trials during 2010 and 2012 summer season. Strain gauge signal were recorded during her icebreaking voyage and the measured strain data were converted to the equivalent hull stress values. The effect of ARAON's speed in ice and the hull stresses are investigated. By comparing the empirical formula and ice load calculation based von measured data, it is recommended to use the empirical ice load estimation formula for the initial design stage.

쐐기형 모형선 주위 연속 쇄빙과정에 관한 입자 기반 수치 시뮬레이션 (Particle-based Numerical Simulation of Continuous Ice Breaking Process around Wedge-type Model Ship)

  • ;신우진;김동현;박종천;정성엽
    • 대한조선학회논문집
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    • 제57권1호
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    • pp.23-34
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    • 2020
  • This paper covers the development of prediction techniques for ice load on ice-breakers operating in continuous ice-breaking under level ice conditions using particle-based continuum mechanics. Ice is assumed to be a linear elastic material until the fracture occurs. The maximum normal stress theory is used for the criterion of fracture. The location of the crack can be expressed using a local scalar function consisting of the gradient of the first principal stress and the corresponding eigen-vector. This expression is used to determine the relative position of particle pair to the new crack. The Hertz contact model is introduced to consider the collisions between ice fragments and the collisions between hull and ice fragments. In order to verify the developed technique, the simulation results for the three-point bending problems of ice-specimen and the continuous ice-breaking problem around a wedge-type model ship with bow angle of 20° are compared with the experimental results carrying out at Korea Research Institute of Ships and Ocean Engineering (KRISO).