The ice class-based rules and restrictions aim to ensure the safety and efficiency of the winter navigation system in the Baltic Sea. The vessel resistance prediction in a brash ice channel is a mid-term step in Finnish-Swedish Ice Class Rules ice class granting process that can be based on model scale tests. However, there are some limitations in the current model scale test guidelines. To improve the test procedures and to provide a better real-world correlation for all ship shapes, this paper explores the relationship between the brash ice properties and vessel resistance utilizing channel resistances measurements in model scale and full scale. The results indicate that the model scale results can be scattered and conservative, especially for modern, open-water-optimized bow shapes when model ice with a scaled-down strength is utilized. Model scale tests in brash ice channels with unscaled ice strength provided good correlation with full scale resistance tests and small variation in repeated tests. The results suggest that the correct modeling of ice fragment interaction would improve the prediction quality for all hull shapes.

基于冰级的规则和限制旨在确保波罗的海冬季导航系统的安全和效率。粗冰通道中的船舶阻力预测是芬兰-瑞典冰级规则冰级授予过程的中期步骤，可以基于模型规模测试。但是，当前的模型规模测试指南存在一些限制。为了改进测试程序并为所有船型提供更好的真实世界相关性，本文利用模型尺度和全尺度的通道阻力测量值探讨了碎冰特性与船舶阻力之间的关系。结果表明，模型尺度结果可能是分散和保守的，特别是对于现代开放水域优化的弓形，当使用按比例缩小的模型冰时。在具有未标度冰强度的碎冰通道中进行的模型规模测试与全尺寸阻力测试具有良好的相关性，并且重复测试的变化很小。结果表明，冰碎片相互作用的正确建模将提高所有船体形状的预测质量。