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Volume 42 Issue 7
Jul.  2016
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Journal of Beijing University of Aeronautics and Astronautics  > 2016  >  42(7): 1509-1517.
YANG Juntan, QIU Zhiping, LI Qiet al. Damage detection of structures with interval uncertain parameters[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(7): 1509-1517. doi: 10.13700/j.bh.1001-5965.2015.0398(in Chinese)
Citation: YANG Juntan, QIU Zhiping, LI Qiet al. Damage detection of structures with interval uncertain parameters[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(7): 1509-1517. doi: 10.13700/j.bh.1001-5965.2015.0398(in Chinese)
shu

Damage detection of structures with interval uncertain parameters

doi: 10.13700/j.bh.1001-5965.2015.0398
  • 1.

    School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

  • 2. State Key Laboratory of Robotics, Shenyang Institute of Automation Chinese Academy of Sciences, Shenyang 110016, China

  • Received Date: 17 Jun 2015
  • Publish Date: 20 Jul 2016
    Abstract
  • To deal with structures with uncertain parameter which often lacks sufficient statistical information in damage detection, the uncertain parameters were modeled as interval numbers. The structural strain modal testing method was introduced using finite element method, and the strain modal was further expressed as the function of the interval parameter. Combined with the first order Taylor expansion and interval analysis, the range of each strain modal under parameter uncertainty is estimated, and thus we obtained an approach for structural damage detection considering uncertainty. Comparison between the proposed method and the traditional probabilistic method was conducted. Numerical simulations of a simply supported beam under different damage were performed by investigating the change of strain modes due to different damage levels and uncertainty levels. The influence rules of damage and uncertainty on strain modal were obtained, and a brief discussion of the impact of noise on damage detection was performed. The work of this paper provides a new technique and thought for damage detection of uncertain structures.

     

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