Acoustic emission source location in composite structure by Voronoi construction using geodesic curve evolution

Gangadharan, R and Prasanna, G and Bhat, MR and Murthy, CRL and Gopalakrishnan, S (2009) Acoustic emission source location in composite structure by Voronoi construction using geodesic curve evolution. In: Journal Of The Acoustical Society Of America, 126 (5). pp. 2324-2330.

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Abstract

Conventional analytical/numerical methods employing triangulation technique are suitable for locating acoustic emission (AE) source in a planar structure without structural discontinuities. But these methods cannot be extended to structures with complicated geometry, and, also, the problem gets compounded if the material of the structure is anisotropic warranting complex analytical velocity models. A geodesic approach using Voronoi construction is proposed in this work to locate the AE source in a composite structure. The approach is based on the fact that the wave takes minimum energy path to travel from the source to any other point in the connected domain. The geodesics are computed on the meshed surface of the structure using graph theory based on Dijkstra's algorithm. By propagating the waves in reverse virtually from these sensors along the geodesic path and by locating the first intersection point of these waves, one can get the AE source location. In this work, the geodesic approach is shown more suitable for a practicable source location solution in a composite structure with arbitrary surface containing finite discontinuities. Experiments have been conducted on composite plate specimens of simple and complex geometry to validate this method.

Item Type:	Journal Article
Publication:	Journal Of The Acoustical Society Of America
Publisher:	Acoustical Society of America
Additional Information:	Copyright for this article belongs to Acoustical Society of America.
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	01 Dec 2009 06:18
Last Modified:	19 Sep 2010 05:52
URI:	http://eprints.iisc.ac.in/id/eprint/25009

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