Open Access

ARTICLE

Identification of Internal Damage in Circular Cylinders through Laser Scanning of Vibrating Surfaces

Yisu Xi¹, Binkai Shi², Wei Xu^1,3,*, Jing Ge⁴, Huaxin Zhu⁵, Dragoslav Sumarac^6,7
1 Department of Engineering Mechanics, Hohai University, Nanjing, 210098, China
2 Department of Basic Education, Rocket Force University of Engineering, Xi’an, 710025, China
3 Jiangsu Province Wind Power Structural Engineering Research Center, Hohai University, Nanjing, 210098, China
4 Jiangsu Hongyuan Science and Technology Engineering Co., Ltd., Changzhou, 213162, China
5 Jiangsu Zhongji Engineering Technology Research Co., Ltd., Nantong, 226001, China
6 College of Civil and Architecture Engineering, Chuzhou University, Chuzhou, 23900, China
7 Department of Technical Sciences, State University of Novi Pazar, Novi Pazar, 36300, Serbia
* Corresponding Author: Wei Xu. Email:

Structural Durability & Health Monitoring 2022, 16(2), 163-177. https://doi.org/10.32604/sdhm.2022.022082

Received 20 February 2022; Accepted 25 February 2022; Issue published 25 April 2022

Abstract

With the aid of non-contact measurements of vibrating surfaces through laser scanning, operating deflection shapes (ODSs) with high spatial resolutions can be used to graphically characterize damage in plane structures. Although numerous damage identification approaches relying on laser-measured ODSs have been developed for plate-type structures, they cannot be directly applied to circular cylinders due to the gap between equations of motions of plates and circular cylinders. To fill this gap, a novel approach is proposed in this study for damage identification of circular cylinders. Damage-induced discontinuities of the derivatives of ODSs can be used to graphically manifest the occurrence of the damage, and characterize the location and size of the damage. The approach is experimentally validated on a specimen of the circular cylinder component, whose out-of-plane ODSs in an inspection region are acquired through laser scanning using a scanning laser vibrometer. The results suggest that the occurrence, location, and size of the internal damage of the circular cylinder can be identified.

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Keywords

Internal damage identification; circular cylinder; non-contact vibration measurement; laser scanning; operating deflection shape

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