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Statistical Uncertainty Analysis in Time-Domain Fatigue Assessment of Steel Risers

机译:钢冒口时域疲劳评估中的统计不确定度分析

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摘要

This paper addresses the statistical uncertainty in long-term fatigue damage in offshore structures due to the short-term simulation length used in time domain analysis of stresses. The paper focuses on steel risers applications. A new simulation-based estimator for the variance of the short-term fatigue damage is presented. The proposed estimator is based on a variation of the original nonparametric bootstrap. It works with blocks of data instead of discrete values, in order to better account for the autocorrelation of the stress cycles in the stress time series. This versatile estimator can be applied in time-domain fatigue analyses to assess the variance of the fatigue damage using a single stress time series and does not require any previous assumptions on the stochastic stress process.
机译:本文讨论了由于应力时域分析中使用的短期模拟长度而导致的海上结构长期疲劳损伤的统计不确定性。本文重点介绍钢制立管的应用。提出了一种基于仿真的短期疲劳损伤方差估计器。提出的估计器基于原始非参数引导程序的变体。它可以处理数据块而不是离散值,以便更好地说明应力时间序列中应力循环的自相关。该通用估计器可用于时域疲劳分析,以使用单个应力时间序列评估疲劳损伤的方差,并且不需要对随机应力过程进行任何先前的假设。

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  • 来源
    《Journal of offshore mechanics and arctic engineering》 |2018年第3期|031701.1-031701.9|共9页
  • 作者单位

    Fed Univ Rio De Janeiro COPPE UFRJ, Dept Civil Engn, Lab Anal & Reliabil Offshore Struct, Av Pedro Calmon S-N, BR-21941596 Rio De Janeiro, RJ, Brazil;

    Fed Univ Rio De Janeiro COPPE UFRJ, Dept Civil Engn, Lab Anal & Reliabil Offshore Struct, Av Pedro Calmon S-N, BR-21941596 Rio De Janeiro, RJ, Brazil;

  • 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
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