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21 August 2001 Lamb wave sensor optimization using differential evolution
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Recent work investigating the use of Lamb-wave propagation to detect and localize damage in composite structures has produced some very encouraging results. Lamb-waves are launched form piezoceramic actuators and the resulting signals are recorded at piezoceramic sensors at various locations on the structure. When damage is introduced into the structure, the Lamb-wave will be modified in some potentially complicated matter. The extent of this modification will be dependent upon the proximity of the damage location to the relevant actuator/sensor path. The purpose of this paper is to propose a strategy for the location of piezoceramic actuators and sensors so as to provide optimum damage detection coverage of the structure. The method used is a differential evolution algorithm constructed so as to minimize a cost function based on either an angular of Lamb-wave propagation distance approach. More complicated effects such as attenuation, edge reflection, orientation of fibers in the structure may be taken into account using this approach. Known trouble spots in the structure may also be given greater priority in a straightforward manner and also components known to cause propagation problems, such as stringers or riveted joints, can be accommodated.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Graeme Manson and Keith Worden "Lamb wave sensor optimization using differential evolution", Proc. SPIE 4326, Smart Structures and Materials 2001: Modeling, Signal Processing, and Control in Smart Structures, (21 August 2001);

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