21 July 2004 Automated structural health monitoring system using acoustic emission and modal data
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Abstract
This paper is concerned with the detection and characterization of hidden defects in advanced structures before they grow to a critical size. A methodology for automatic damage identification and localization is developed using a combination of vibration and wave propagation data. The structure is assumed to be instrumented with an array of actuators and sensors to excite and record its dynamic response, including vibration and wave propagation effects. A damage index, calculated from the measured dynamical response of the structure in a reference state and the current state, is introduced as a determinant of structural damage. The indices are used to identify low velocity impact damages in composite as well as aluminium plates for different arrangements of the source and the receivers. The potential applications of the approach in developing health monitoring systems in defects-critical structures is discussed.
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Ajit K. Mal, Sauvik Banerjee, Fabrizio Ricci, "Automated structural health monitoring system using acoustic emission and modal data", Proc. SPIE 5394, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III, (21 July 2004); doi: 10.1117/12.539194; http://dx.doi.org/10.1117/12.539194
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KEYWORDS
Composites

Sensors

Wave propagation

Receivers

Structural health monitoring

Aluminum

Acoustic emission

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