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Ultrasonic Guided Wave Based Damage Detection Using Low-dimensional Data from Laser Doppler Scan

Geetha, Ganesh K and Mahapatra, Roy D (2015) Ultrasonic Guided Wave Based Damage Detection Using Low-dimensional Data from Laser Doppler Scan. In: 10th International Workshop on Structural Health Monitoring (IWSHM), SEP 01-03, 2015, Stanford Univ, Stanford, CA, pp. 2647-2654.

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Abstract

In the current state of the art, it remains an open problem to detect damage with partial ultrasonic scan data and with measurements at coarser spatial scale when the location of damage is not known. In the present paper, a recent development of finite element based model reduction scheme in frequency domain that employs master degrees of freedom covering the surface scan region of interests is reported in context of non-contact ultrasonic guided wave based inspection. The surface scan region of interest is grouped into master and slave degrees of freedom. A finite element wise damage factor is derived which represents damage state over distributed areas or sharp condition of inter-element boundaries (for crack). Laser Doppler Vibrometer (LDV) scan data obtained from plate type structure with inaccessible surface line crack are considered along with the developed reduced order damage model to analyze the extent of scan data dimensional reduction. The proposed technique has useful application in problems where non-contact monitoring of complex structural parts are extremely important and at the same time LDV scan has to be done on accessible surfaces only.

Item Type: Conference Proceedings
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Additional Information: Copy right for this article belongs to the DESTECH PUBLICATIONS, INC, 439 DUKE STREET, LANCASTER, PA 17602-4967 USA
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 06 Jan 2016 05:40
Last Modified: 06 Jan 2016 05:40
URI: http://eprints.iisc.ernet.in/id/eprint/53067

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