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Enhancement of Lamb Wave Imaging Resolution by Step Pulse Excitation and Prewarping
Joint Authors
Fu, Zhi-Kai
Shi, Li-Hua
Fu, Shang-Chen
Zhou, Yinghui
Source
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-02-22
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
For the purpose of improving the damage localization accuracy, a prewarping technology is combined with step pulse excitation and this method is used in Lamb wave imaging of plate structures with adjacent damages.
Based on the step pulse excitation, various narrowband or burst response can be derived by signal processing technology and this method provides flexibility for further prewarping approach.
A narrowband signal warped with a preselected distance is then designed, and the dispersion in the response of this prewarping signal will be greatly reduced.
However, in order to calculate the distance for prewarping, the first arrival needs to be estimated from the burst response.
From the step-pulse response, narrowband responses at different central frequencies can be obtained, and by averaging peak-value time of their first arrivals, a more accurate estimation can be calculated.
By using the prewarping method to the damage scattering signals before imaging, the imaging resolution of the delay-and-sum method can be highly enhanced.
The experiment carried out in an aluminum plate with adjacent damages proves the efficiency of this method.
American Psychological Association (APA)
Fu, Shang-Chen& Shi, Li-Hua& Zhou, Yinghui& Fu, Zhi-Kai. 2015. Enhancement of Lamb Wave Imaging Resolution by Step Pulse Excitation and Prewarping. Shock and Vibration،Vol. 2015, no. 2015, pp.1-8.
https://search.emarefa.net/detail/BIM-1077995
Modern Language Association (MLA)
Fu, Shang-Chen…[et al.]. Enhancement of Lamb Wave Imaging Resolution by Step Pulse Excitation and Prewarping. Shock and Vibration No. 2015 (2015), pp.1-8.
https://search.emarefa.net/detail/BIM-1077995
American Medical Association (AMA)
Fu, Shang-Chen& Shi, Li-Hua& Zhou, Yinghui& Fu, Zhi-Kai. Enhancement of Lamb Wave Imaging Resolution by Step Pulse Excitation and Prewarping. Shock and Vibration. 2015. Vol. 2015, no. 2015, pp.1-8.
https://search.emarefa.net/detail/BIM-1077995
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1077995