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A stochastic method for the prediction of icebreaker bow extreme stresses

机译：一种预测破冰弓极度应力的随机方法

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It is well established that the ship-ice interaction process is quite complex and associated ice loads on the icebreaker hull is a stochastic process. Obviously, novel accurate statistical methods and models should be developed and applied to estimate extreme bow stresses.This paper studies icebreaker bow stresses based on measured distribution of ice thickness in the Arctic Ocean on the way to and from the North Pole. Since the vessel route was carefully selected searching for easier ice conditions, the Arctic Ocean crossing was not a straight linear but a meandering path. Thus, the specific ship route data was biased with respect to general ice statistics in the region, but true with respect to the route specific ice data encountered by a ship navigating in that region. Therefore the route specific ice thickness data is directly needed for ship design and navigation analysis. It is assumed that captains are competent and knowledgeable, and therefore will select a route that provides the most favourable ice conditions.This paper contributes to study of the newest Chinese self-designed polar icebreaker, serving the purpose of enhancing icebreaker operational reliability. Finite Element Method software package ANSYS/LS-DYNA has been employed to simulate bow stress pattern for a particular icebreaker operating in the Arctic Ocean. Extreme bow stresses were estimated using Naess-Gaidai method. The latter is a first application of Naess-Gaidai method to a distribution with lower bound. Thus this paper aims at introducing an efficient method of estimating route-specific icebreaker extreme bow stresses.
机译：很好地确定，船舶冰相互作用过程是非常复杂的并且在破冰船体上有相关的冰负荷是随机过程。显然，应该开发新的准确统计方法和模型来估计极端弓应力。本文基于北极途中的冰厚度测量的冰厚度分布的破冰弓胁迫。由于船舶路线被仔细选择寻找更容易的冰条件，因此北极海洋交叉不是直线的，而是一种蜿蜒的道路。因此，特定的船舶路由数据相对于该区域的一般冰统计偏置，但是对于在该区域中导航的船舶遇到的路线特定冰数据而真实。因此，船舶设计和导航分析直接需要路线特定冰厚度数据。假设船长是有能力和知识渊博的，因此将选择一条提供最有利的冰条件的路线。本文有助于研究最新的中国自行自行解冻破冰船，为提高破冰船运行可靠性的目的。有限元方法软件包ANSYS / LS-DYNA已被用于模拟在北冰洋中操作的特定破冰船的弓应力模式。使用Naess-Gaidai方法估计极端弓应力。后者是Naess-Gaidai方法的第一次应用于下限的分布。因此，本文旨在引入估算特定路线破冰的最有效的方法。

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