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- Title
Vision‐based robust missing and loosened bolt detection for splice plate joints.
- Authors
Yao, Zhidong; Chen, Zhihua; Liu, Hongbo; Lu, Jiaqi
- Abstract
Summary: Vision‐based bolt defect detection methods based on feature changes have been reported. However, the robustness of key feature extraction and bolt detection requires improvement. This paper proposes a robust missing and loose bolt defect detection approach. The key features—reference points for perspective correction and the straight lines of the bolt edges—are extracted from the masks obtained by semantic segmentation models. The true and false bolt discrimination approach based on the mask shape can help improve bolt object detection accuracy. Overlapping between the bolt bounding boxes in the reference and detection images indicates missing bolts. The rotation angles reveal loosened bolts. The proposed approach was tested on fabricated bolted joint specimens and a steel railway bridge. The results suggest that these improvements ensure defect detection accuracy, with a miss rate of only 1% for missing bolt detection. Moreover, a loosened bolt with only 3° rotation is successfully detected. This approach has promising potential applicability in automatically detecting bolt defects in large steel structures.
- Subjects
FEATURE extraction; BOLTED joints; RAILROAD bridges; IRON &; steel bridges; ROTATIONAL motion; AUDITORY masking
- Publication
Structural Design of Tall & Special Buildings, 2024, Vol 33, Issue 10, p1
- ISSN
1541-7794
- Publication type
Article
- DOI
10.1002/tal.2099