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Influence of load spectrum assumptions on the expected reliability of hydroelectric turbines: A case study

机译:载荷谱假设对水轮机预期可靠性的影响:一个案例研究

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摘要

A lack of observed data can lead to significant discrepancy between estimated and actual fatigue reliability. In this study, the load spectrum derived from the strain measurements and operation history of a hydroelectric turbine are used to identify the information necessary to avoid major bias in the estimated fatigue reliability of such structure. Our results demonstrate that a limited number of parameters need to be considered. Any further simplifications may lead to major reliability estimate discrepancies. Furthermore, we observe that the parameters which influence initial reliability hide the influence of other parameters on the reliability failure rate associated with the structure's life expectancy. We conclude that a typical sensitivity analysis made on parameter values needs to be complemented with a sensitivity study on the chosen assumptions in order to properly evaluate the risks associated with the operation of hydroelectric turbines.
机译:缺乏观察到的数据会导致估计疲劳可靠性和实际疲劳可靠性之间的巨大差异。在这项研究中,从应变测量和水力涡轮机的运行历史中得出的载荷谱可用于识别必要的信息,从而避免此类结构的估计疲劳可靠性产生重大偏差。我们的结果表明需要考虑数量有限的参数。任何进一步的简化都可能导致重大的可靠性估计差异。此外,我们观察到影响初始可靠性的参数掩盖了其他参数对与结构预期寿命相关的可靠性故障率的影响。我们得出的结论是,对参数值进行的典型灵敏度分析需要辅之以对所选假设进行的灵敏度研究,以正确评估与水力涡轮机运行相关的风险。

著录项

  • 来源
    《Structural Safety》 |2014年第2014期|1-8|共8页
  • 作者单位

    Ecole de technologie superieure (ETS), Montreal, Quebec H3C 1K3, Canada,Institut de recherche d'Hydro-Quebec (IREQ), Varennes, Quebec J3X 1S1, Canada;

    Ecole de technologie superieure (ETS), Montreal, Quebec H3C 1K3, Canada;

    Ecole de technologie superieure (ETS), Montreal, Quebec H3C 1K3, Canada;

    Institut de recherche d'Hydro-Quebec (IREQ), Varennes, Quebec J3X 1S1, Canada;

  • 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

    Load spectrum; Reliability; Hydroelectric turbine; High Cycle Fatigue (HCF);

    机译:负载谱;可靠性;水力发电机;高循环疲劳(HCF);

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