Damage Identification by Using a Self-Synchronizing Multipoint Laser Doppler Vibrometer
Joint Authors
Fu, Y.
Yang, Chong
Yuan, Jianmin
Guo, Min
Yan, Keyu
Liu, Huan
Zhu, Changchun
Miao, Hong
Source
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-01-14
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
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.
American Psychological Association (APA)
Yang, Chong& Fu, Y.& Yuan, Jianmin& Guo, Min& Yan, Keyu& Liu, Huan…[et al.]. 2015. Damage Identification by Using a Self-Synchronizing Multipoint Laser Doppler Vibrometer. Shock and Vibration،Vol. 2015, no. 2015, pp.1-9.
https://search.emarefa.net/detail/BIM-1078170
Modern Language Association (MLA)
Yang, Chong…[et al.]. Damage Identification by Using a Self-Synchronizing Multipoint Laser Doppler Vibrometer. Shock and Vibration No. 2015 (2015), pp.1-9.
https://search.emarefa.net/detail/BIM-1078170
American Medical Association (AMA)
Yang, Chong& Fu, Y.& Yuan, Jianmin& Guo, Min& Yan, Keyu& Liu, Huan…[et al.]. Damage Identification by Using a Self-Synchronizing Multipoint Laser Doppler Vibrometer. Shock and Vibration. 2015. Vol. 2015, no. 2015, pp.1-9.
https://search.emarefa.net/detail/BIM-1078170
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1078170