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首页> 外文期刊>The Transactions of the Royal Institution of Naval Architects >ALTERNATIVE ASSESSMENT OF WEATHER CRITERION FOR SHIPS WITH LARGE BREADTH AND DRAUGHT RATIOS BY A MODEL EXPERIMENT: A CASE STUDY ON AN INDONESIAN RO-RO FERRY
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ALTERNATIVE ASSESSMENT OF WEATHER CRITERION FOR SHIPS WITH LARGE BREADTH AND DRAUGHT RATIOS BY A MODEL EXPERIMENT: A CASE STUDY ON AN INDONESIAN RO-RO FERRY

机译：基于模型实验的大宽幅比草稿船舶天气标准替代评估：以印度尼西亚滚装轮渡为例

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摘要

The weather criterion is one of stability criteria to verify ability of a ships to withstand the combined effects of severe wind and rolling criteria in dead ship condition. An overestimated roll angle is obtained when the weather criterion is applied to ships with breadth and draught ratios larger than 3.50 and ratios between vertical centre of gravity and draught larger than 1.50. This paper discusses the assessment of weather criterion for an Indonesian ro-ro ferry by model experiments. The drift test is performed in four wave steepnesses with wave frequencies near the roll natural frequency. The maximum roll amplitude is used to calculate the effective wave slope coefficient correponding to the wave steepness, with Benin's coefficient obtained by the roll decay test. The damping factors correspond to the breadth and draught ratio as well as the bilge keel contribution are determined using the formula of weather criterion with the roll angle obtained by the Japanese formula with a correction factor of 0.70 due to the irregularity of waves. The obtained effective wave slope coefficient and the damping factors due to breadth and draught ratio and the bilge keel are smaller than those used in the weather criterion.
机译：天气标准是验证船舶在死船条件下承受强风和横摇标准综合影响的能力的稳定标准之一。当天气标准应用于宽度和吃水深度比大于3.50且垂直重心与吃水深度之比大于1.50的船舶时，将获得高估的侧倾角。本文讨论了通过模型实验评估印尼滚装渡轮的天气标准。漂移测试是在四个波陡度下进行的，波的频率接近侧倾固有频率。最大侧倾幅度用于计算与波陡度相对应的有效波斜率系数，贝宁系数通过侧倾衰减测试获得。对应于宽度和吃水比的阻尼系数以及舱底龙骨的贡献是使用天气标准公式确定的，该系数的滚动角由日语公式获得，由于波浪的不规则性，其修正系数为0.70。所获得的有效波斜率系数以及由于宽度和吃水比以及舱底龙骨引起的阻尼系数均小于天气标准中使用的系数。

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