Vision-Based Modal Analysis Using Multiple Vibration Distribution Synthesis to Inspect Large-Scale Structures

DOI PDF 6 Citations 28 References Open Access
  • Tadayoshi Aoyama
    Department of Micro-Nano Mechanical Science and Engineering, Nagoya University Nagoya, Aichi 4648603, Japan e-mail:
  • Liang Li
    Process Control Systems Software Design Department, Hitachi High-Technologies Corporation, Tokyo 1058717, Japan e-mail:
  • Mingjun Jiang
    Department of System Cybernetics, Hiroshima University, Higashi-Hiroshima 7898527, Hiroshima, Japan e-mail:
  • Takeshi Takaki
    Department of System Cybernetics, Hiroshima University, Higashi-Hiroshima 7898527, Hiroshima, Japan e-mail:
  • Idaku Ishii
    Department of System Cybernetics, Hiroshima University, Higashi-Hiroshima 7898527, Hiroshima, Japan e-mail:
  • Hua Yang
    State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430073, Hubei, China, e-mail:
  • Chikako Umemoto
    Keisoku Research Consultant Co., Hiroshima 732-0029, Hiroshima, Japan e-mail:
  • Hiroshi Matsuda
    Department of Structural Engineering, Nagasaki University, Nagasaki 8528521, Nagasaki, Japan e-mail:
  • Makoto Chikaraishi
    Graduate School for International Development and Cooperation, Hiroshima University, Higashi-Hiroshima 7898529, Hiroshima, Japan e-mail:
  • Akimasa Fujiwara
    Graduate School for International Development and Cooperation, Hiroshima University, Higashi-Hiroshima 7898529, Hiroshima, Japan e-mail:

Description

<jats:p>Previously, we proposed a multithread active vision system with virtual multiple pan-tilt tracking cameras by rapidly switching the viewpoints for the vibration sensing of large-scale structures. We also developed a system using a galvanometer mirror that can switch 500 different viewpoints in 1 s. However, the measurement rate of each observation point is low, and the time density is not always sufficient. In addition, strong multiple illuminations are required for the system owing to the retro reflective markers attached to the object being observed. In this study, we propose a multiple vibration distribution synthesis method for vibration analysis that increases the sampling rate of each observation point in the multi-thread active vision system, which is subsequently modified to a system that requires only one illumination by using corner cubes as markers. Several dynamics-based inspection experiments are conducted for a 4 m long truss-structure bridge model. The proposed method and system are verified via a high-order modal analysis, which was impossible to perform in the previous method and system.</jats:p>

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