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Guided Ultrasonic Wave Propagation through Inaccessible Damage in a Folded Plate using Sensor-Actuator Network

Geetha, Kolappan G and Mahapatra, Roy D and Gopalakrishnan, S (2013) Guided Ultrasonic Wave Propagation through Inaccessible Damage in a Folded Plate using Sensor-Actuator Network. In: Conference on Health Monitoring of Structural and Biological Systems , 11-14, 2013, San Diego,.

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Official URL: http://dx.doi.org/10.1117/12.2010519

Abstract

Rapid diagnostics and virtual imaging of damages in complex structures like folded plate can help reduce the inspection time for guided wave based NDE and integrated SHM. Folded plate or box structure is one of the major structural components for increasing the structural strength. Damage in the folded plate, mostly in the form of surface breaking cracks in the inaccessible zone is a usual problem in aerospace structures. One side of the folded plate is attached (either riveted or bonded) to adjacent structure which is not accessible for immediate inspection. The sensor-actuator network in the form of a circular array is placed on the accessible side of the folded plate. In the present work, a circular array is employed for scanning the entire folded plate type structure for damage diagnosis and wave field visualization of entire structural panel. The method employs guided wave with relatively low frequency bandwidth of 100-300 kHz. Change in the response signal with respect to a baseline signal is used to construct a quantitative relationship with damage size parameters. Detecting damage in the folded plate by using this technique has significant potential for off-line and on-line SHM technologies. By employing this technique, surface breaking cracks on inaccessible face of the folded plate are detected without disassembly of structure in a realistic environment.

Item Type: Conference Proceedings
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Additional Information: Copyright for this article belongs to the SPIE-INT SOC OPTICAL ENGINEERING
Keywords: Lamb wave; sensor-actuator network; folded plate; damage; crack; aircraft; wavelet; circular array
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 04 Oct 2013 05:43
Last Modified: 22 Nov 2013 07:33
URI: http://eprints.iisc.ernet.in/id/eprint/47531

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