The vibration of structures is a very common phenomenon, and obtaining vibration information of bridges can effectively analyze their health status. To identify local damage to the structure, using a camera to capture vibrations of the structure, this study uses the optical flow method to calculate the displacement, frequency, and mode shape of the structure from spatiotemporal sequence images. A local weighted modal strain energy change rate index can be calculated, and structural damage can be identified by comparing the energy change rate before and after damage. A cantilever beam was employed to test the way. The results show that the optical flow method correlates well with numerical simulation results, with a maximum error of 5% based on structure frequency. With a weighted modal strain energy change rate index, it is easier to determine the damage location; Comparing different damage degrees of the same unit yields the size of the damage degree.
Weighted Modal Strain Energy Damage Identification Based on Image Sequences
Lect.Notes Mechanical Engineering
International conference on Advancement in Materials, Manufacturing, and Energy Engineering ; 2022 ; Xi'an, China September 23, 2022 - September 25, 2022
Recent Advances in Applied Mechanics and Mechanical Engineering ; Kapitel : 21 ; 201-213
2023-08-09
13 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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