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Title: Damage identification by using a self-synchronizing multipoint laser doppler vibrometer
Authors: Miao, Hong
Zhu, Changchun
Yang, Chong
Fu, Yu
Yuan, Jianmin
Guo, Min
Yan, Keyu
Liu, Huan
Keywords: DRNTU::Engineering::Mechanical engineering
Damage Identification
Laser Doppler Vibrometers
Issue Date: 2015
Source: Yang, C., Fu, Y., Yuan, J., Guo, M., Yan, K., Liu, H., . . . & Zhu, C. (2015). Damage identification by using a self-synchronizing multipoint laser doppler vibrometer. Shock and Vibration, 2015, 476054-. doi:10.1155/2015/476054
Series/Report no.: Shock and Vibration
Abstract: The vibration-based damage identification method extracts the damage location and severity information from the change of modal properties, such as natural frequency and mode shape. Its performance and accuracy depends on the measurement precision. Laser Doppler vibrometer (LDV) provides a noncontact vibration measurement of high quality, but usually it can only do sampling on a single point. Scanning LDV is normally used to obtain the mode shape with a longer scanning time. In this paper, a damage detection technique is proposed using a self-synchronizing multipoint LDV. Multiple laser beams with various frequency shifts are projected on different points of the object, reflected and interfered with a common reference beam. The interference signal containing synchronized temporal vibration information of multiple spatial points is captured by a single photodetector and can be retrieved in a very short period. Experiments are conducted to measure the natural frequencies and mode shapes of pre- and postcrack cantilever beams. Mode shape curvature is calculated by numerical interpolation and windowed Fourier analysis. The results show that the artificial crack can be identified precisely from the change of natural frequencies and the difference of mode shape curvature squares.
ISSN: 1070-9622
DOI: 10.1155/2015/476054
Schools: School of Mechanical and Aerospace Engineering 
Organisations: MINDEF
Research Centres: Temasek Laboratories 
Rights: © 2015 Chong Yang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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