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Fault detection in vibration systems: Identifying damaged moorings

机译:振动系统中的故障检测:识别损坏的系泊设备

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摘要

Offshore platforms are anchored to the ocean floor using moorings to prevent excessive drifting, and these moorings need to be monitored for damage, an expensive process. Is it possible to detect a change in moorings stiffness by measuring the motion of the platform under random wave forcing? The platform's response is strongly dependent on the wave spectrum and direction of forcing, this forcing is random, and the measurements are indirect, so it seems unlikely. To examine the feasibility we examine a much simpler but analogous spring plate-table system with table rotation mimicking wave action. We find that by using a modal analysis of the underlying system one can unscramble the plates response and thus determine spring stiffness changes under random forcing, however, as one would expect, the forcing has to have components in an 'active' frequency and direction range. In principle the same type of analysis can be used for real moorings.
机译:海上平台使用系泊设备固定在海床上,以防止过度漂移,因此需要监控这些系泊设备的损坏情况,这是一个昂贵的过程。通过测量在随机波浪作用下平台的运动,是否可以检测到系泊刚度的变化?平台的响应在很大程度上取决于波谱和强迫的方向,这种强迫是随机的,并且测量是间接的,因此似乎不太可能。为了检验可行性,我们研究了一个更简单但类似的弹簧板-桌子系统,该系统具有模仿波动作的桌子旋转。我们发现,通过对下层系统进行模态分析,可以使板的响应更准确,从而确定随机作用力下的弹簧刚度变化,但是,正如人们所期望的那样,作用力必须具有在“有效”频率和方向范围内的分量。原则上,相同类型的分析可用于实际系泊设备。

著录项

  • 来源
    《Ocean Engineering》 |2018年第15期|577-589|共13页
  • 作者单位

    Univ Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia;

    Univ Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia;

    Univ Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia;

    Univ Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Moorings; Inverse; Modal; Symmetry; Faults; Detection;

    机译:系泊;反;模态;对称;断层;探测;

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