Development of a fatigue model useful in ship routing design
Development of a fatigue model useful in ship routing design
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发表时间：
2010-12
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通讯作者：
Wengang Mao;J. Ringsberg;I. Rychlik;G. Storhaug
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作者：
Wengang Mao;J. Ringsberg;I. Rychlik;G. Storhaug
在本文中，仅使用遇到的显着波高的简单疲劳估计模型用于预测船舶在航行期间的疲劳累积。该模型的公式是基于窄带近似而开发的。假设有效响应范围 hs 与遇到的有效波高 Hs 呈线性关系。平均应力上交叉频率 fz 由相应的遇到波频率表示，并表示为 Hs 的函数。该模型的能力和准确性通过应用于 2008 年在北大西洋运营的一艘集装箱船船中部的疲劳损伤累积细节来说明。对于这艘船，疲劳模型中所需的所有必要数据以及验证它的数据都是通过测量获得的。将所提出的疲劳模型的结果与众所周知的准确雨流分析进行比较。非线性的影响，例如还讨论了鞭打对疲劳损伤预测和极端响应的影响。
In this paper, a simple fatigue estimation model using only encountered significant wave height, is used for predicting fatigue accumulation of a vessel during a voyage. The formulation of the model is developed based on the narrow-band approximation. It is assumed that the significant response range, hs, has a linear relationship with encountered significant wave height, Hs. The mean stress up-crossing frequency, fz, is represented by the corresponding encountered wave frequency and it is expressed as a function of Hs. The capacity and accuracy of the model is illustrated by application to one container vessel’s fatigue damage accumulation in an amidships detail, operating in the North Atlantic during 2008. For this vessel, all the necessary data needed in the fatigue model, and for verification of it, was obtained by measurements. The results from the proposed fatigue model are compared with the well-known and accurate rainflow analysis. Influence of nonlinearities, e.g. whipping, on fatigue damage predictions and extreme responses is also discussed.