무한 빙판에서의 쇄빙력과 파단 빙편의 크기 예측
Estimation of Icebreaking Forces and Failure Length of Ice Rubbleson Infinite Ice Sheet
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Abstract
Ice rubble pieces broken by the bow impact load and side hull of an icebreaking vessel usually pass along the ship's bottom hull and may hit the propeller/rudder or other stern structures causing serious damage to ship's hull. Therefore it is important to estimate the size of broken ice pieces during the icebreaking process. The dynamic interaction process of icebreaker with infinite ice sheet is simplified as a wedge type beam of finite length supported by elastic foundation. The wedge type ice beam is loaded with vertical impact forces due to the inclined bow stem of icebreaking vessels. The numerical model provides locations of maximum dynamic bending moment where extreme tensile stress arises and also possible fracture occurs. The model can predict a failure length of broken ice sheet given design parameters. The results are compared to Nevel(1961)'s analytical solution for static load and observed pattern of ice sheet failure onboard an icebreaker. Also by comparing computed failure length with the characteristic length, the meaning of ice rubble sizes is discussed.
참고문헌 (13)
- "“빙해항행선박의선수부 형상과 쇄빙능력에 관한 연구", 제 4, pp.87~97 (1992)
- "Airfields on Floating IceSheets with Supplements" (1956)
- "Load Bearing Capacity ofan Ice Cover subjected to ConcentratedLoads Proc. of the 4th International OffshoreMechanics and Arctic Engineering Symposium", 2, pp.170~176 (1985)
- "TheBearing Capacity of Ice Covers under StaticLoads Canadian J. of Civil Engineering", 3, pp.288~293 (1976)
- "Use of Ice Covers forTransportation", 8, pp.170~181 (1971)
- "Beams on ElasticFoundation University of Michigan Press" (1947)
- "ViscoelasticDeformations and Stresses of FloatingIce Plates M.I.T. Dept. of Ocean EngineeringReport 81-3." (1981)
- "The Critical Velocities of aLoad moving on a Floating Ice Plate that isSubjected to In-plane Forces", 6, pp.267~274 (1983)
- "TheDeformations and Stresses in Floating IcePlates", 15, pp.57~72 (1972)
- "The Narrow Free InfiniteWedge on an Elastic Foundation" (1961)
- "An Analytical Model for Wave Propagation across a Crack in an Ice Sheet", 10(3), pp.173~176 (2000)
- "Theory of Plates and Shells", s. and woi(wski-krieger) (1959), McGraw HillInc.
- "“Eight Years of PerformanceMeasurements aboard USCG Polar ClassIcebreakers", 100, pp.123~131 (1992)