This investigation examines how the nonlinear structural response of a ship side-shell structure that impacts with ice is affected by the layout/design of the structure, ice characteristics and ship speed operational conditions. The finite element (FE) method was used for nonlinear analysis and comparison of a reference side-shell structure with a topology-optimized structure. Nonlinear dynamic FE collision simulations were carried out, using the reference side-shell structure, to study how the impact with ice (having different values of damping coefficients), and the variation in ship speed operational conditions, affected the damage caused to the side-shell. In addition, the results from the comparison of the topology-optimized and reference side-shell structures showed slightly larger stresses locally in the former structure. It was concluded that it was possible to reduce the weight of the reference side-shell structure and that the objective function and optimization require more detailed investigation. The FE analyses with various damping coefficients of ice showed that, for the chosen values of the damping coefficients, there was only small influence on the dynamic nonlinear response of the reference side-shell structure. Finally, a limit value for the maximum allowed velocity in the normal direction towards a level ice belt of the reference side-shell structure was calculated to result in an elastic structural response of the side-shell. For a side-shell structure movement in the direction along a level ice, the influence of velocity on structural response was negligible due to low friction between the side-shell structure and the ice in the contact.

中文翻译：

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冰载侧壳结构非线性动力结构行为的数值分析

这项研究调查了受冰影响的船侧壳结构的非线性结构响应如何受到结构的布局/设计，冰的特性和船速操作条件的影响。有限元（FE）方法用于非线性分析和参考侧壳结构与拓扑优化结构的比较。使用参考侧壳结构进行了非线性动态有限元碰撞仿真，以研究冰的冲击（具有不同的阻尼系数值）以及船速操作条件的变化如何影响对侧冰造成的损害。贝壳。另外，拓扑优化和参考侧壳结构的比较结果表明，在前一种结构中局部应力稍大。结论是可以减轻参考侧壳结构的重量，并且目标功能和优化需要更详细的研究。各种冰阻尼系数的有限元分析表明，对于选定的阻尼系数值，对参考侧壳结构的动态非线性响应影响很小。最终，计算出朝向参考侧壳结构的水平冰带的法线方向上的最大允许速度的极限值，以导致侧壳的弹性结构响应。对于侧壳结构沿水冰方向的运动，速度对结构响应的影响可以忽略不计，这是因为侧壳结构与接触中的冰之间的摩擦较小。