Smart Structures and Systems

  • 제27권5호
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  • Pages.783-793
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  • 2021
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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Detection and quantification of bolt loosening using RGB-D camera and Mask R-CNN

  • Chung, Junyeon (Department of Civil and Environmental Engineering, Korea Advanced Institute for Science and Technology) ;
  • Sohn, Hoon (Department of Civil and Environmental Engineering, Korea Advanced Institute for Science and Technology)
  • 투고 : 2020.08.27
  • 심사 : 2021.01.15
  • 발행 : 2021.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

Bolt loosening is one of the most common types of damage for bolt-connected plates. Existing vision techniques detect bolt loosening based on the measurement of bolt rotation or the exposure of bolt threads. However, these techniques examine bolt tightness only in a qualitative manner, or require a reference measurement at the initially tightened state of the bolt for quantitative estimation. In this study, the exposed shank length of a bolt is quantitatively measured using an RGB-depth camera and a mask-region-based convolutional neural network but without requiring any measurement from the initial state of the bolt. The performance of the proposed technique is validated by conducting lab-scale experiments, in which the angle and distance of the camera are varied with respect to a target inspection area. The proposed technique successfully detects bolt loosening at exposed shank length over 3 mm with a resolution of 1 mm and 97% accuracy at different camera angles (40°-90°) and distances (up to 65 cm).

키워드

과제정보

This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2019R1A3B3067987).

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