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Safety Index of Fatigue Failure for Ship Structure Details

机译:船舶结构细节疲劳失效安全指数

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摘要

One way to assess the uncertainty in fatigue damage analysis is to use a so-called safety index. In the computation of such an index, the variation coefficient for the accumulated damage is required. In this paper the expected fatigue damage and its coefficient of variation are firstly estimated from measured stress. Secondly, when suitable stress measurements are not available these are computed from models for damage accumulation and sea states variability. Stresses during the ship sailing period are regarded as the nonstationary, slowly changing, Gaussian processes, and hence damage accumulation, during encountered sea state, can be approximated by an algebraic function of significant wave height, ship speed, and heading angle. Further, the space time variability of significant wave height is modeled as a log normal field with parameters estimated from the satellite measurements. The proposed methods to estimate uncertainties in the damage accumulation process are validated using full-scale measurements carried out for a container vessel operating in the North Atlantic.
机译:评估疲劳损伤分析不确定性的一种方法是使用所谓的安全指数。在这样的指标的计算中,需要累积损伤的变化系数。在本文中,首先根据测量应力估算了预期的疲劳损伤及其变化系数。其次,当没有合适的应力测量值时,可根据损伤累积和海况可变性的模型来计算应力测量值。船舶航行期间的应力被认为是非平稳的,缓慢变化的高斯过程,因此在遇到海况期间,损伤累积可以通过重要的波高,船速和航向角的代数函数来近似。此外,将重要波高的时空变化建模为对数正态场,并使用从卫星测量值估计的参数。通过对在北大西洋运行的集装箱船进行的全面测量,可以验证所提出的估算损害累积过程中不确定性的方法。

著录项

  • 来源
    《Journal of Ship Research》 |2010年第3期|P.197-208|共12页
  • 作者单位

    Department of Mathematical Sciences, Chalmers University of Technology, Gothenburg, Sweden;

    rnDepartment of Mathematical Sciences, Chalmers University of Technology, Gothenburg, Sweden;

    Def Norske Veritas, Maritime Technical Consultancy, Hovik, Norway;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fatigue; damage analysis; safety; loads;

    机译:疲劳;损害分析;安全;负载;
  • 入库时间 2022-08-18 01:37:09

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