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Field evaluation of optical-based three-dimensional dynamic motion measurement system with multiple targets for a floating structure

机译：基于光学的多目标浮动物体三维动态测量系统的现场评估

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摘要

Recently, optical-based dynamic measurement techniques are becoming more popular owing to the development of high quality and low-price hardware and image processing software. However, there exist several research issues related to these systems including the self-vibration of a capturing device and the optimal threshold value for image processing. From an application point of view, the application area is limited to the two-dimensional flume tank tests and one-dimensional deflection measurement; therefore, it is desirable to extend this application to measuring the three-dimensional motion such as the motion of a real utility-scale structure. In this study, an optical-based dynamic motion measurement technique using multiple targets is proposed to measure the three-dimensional dynamic motion of floating structures. A new scheme is also proposed to determine an appropriate threshold value to discriminate the background by minimizing an estimation error index. The proposed method is applied to field measurement of the dynamic motion of a large concrete floating structure under various wave conditions, and the results are compared with those from a conventional real-time kinematic global positioning system and a motion reference unit (MRU). The results show that the optical-based system is much better than the other two systems for measuring transverse motions, and it is comparable to the MRU device for measuring rotational motions.
机译：近年来，由于高质量和廉价硬件和图像处理软件的发展，基于光学的动态测量技术变得越来越流行。但是，存在与这些系统有关的几个研究问题，包括捕获设备的自振动和图像处理的最佳阈值。从应用的角度来看，应用领域仅限于二维水槽试验和一维挠度测量。因此，期望将该应用扩展到测量三维运动，例如实际的公用事业规模结构的运动。在这项研究中，提出了一种基于光学的使用多个目标的动态运动测量技术来测量浮动结构的三维动态运动。还提出了一种新的方案，该方案通过最小化估计误差指数来确定适当的阈值以区分背景。将该方法应用于大型混凝土浮动结构在各种波浪条件下的动态运动的现场测量，并将结果与​​常规实时运动学全球定位系统和运动参考单元（MRU）的结果进行了比较。结果表明，基于光学的系统比其他两个用于测量横向运动的系统要好得多，并且与用于测量旋转运动的MRU设备相当。

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  • 来源
    《Ocean Engineering》 |2013年第1期|140-151|共12页
  • 作者

    Jin-Hak Yi; Jin-Ha Kim; Weon Mu Jeong; Jang-Won Chae;

  • 作者单位

    Coastal Development and Ocean Energy Research Division, Korea Institute of Ocean Science and Technology, 787 Haeanro, Ansan, Cyeonggi 426-744, South Korea;

    Offshore Plant Research Division, Korea Institute of Ocean Science and Technology, Daejeon, South Korea;

    Coastal Development and Ocean Energy Research Division, Korea Institute of Ocean Science and Technology, 787 Haeanro, Ansan, Cyeonggi 426-744, South Korea;

    Coastal Development and Ocean Energy Research Division, Korea Institute of Ocean Science and Technology, 787 Haeanro, Ansan, Cyeonggi 426-744, South Korea;

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  • 正文语种 eng
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  • 关键词

    optical-based dynamic motion; measurement; selection of threshold value; global positioning system; motion reference unit; floating structures;

    机译：基于光学的动态运动;测量;阈值的选择;全球定位系统;运动参考单元;浮动结构;

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