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

R Gangadharan1, G Prasanna, M R Bhat

  • 1Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560012, India.

The Journal of the Acoustical Society of America
|November 10, 2009
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Summary

This study introduces a geodesic approach for pinpointing acoustic emission (AE) sources in complex composite structures. This method offers a practical solution for locating AE events, overcoming limitations of traditional techniques.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Applied Physics

Background:

  • Conventional acoustic emission (AE) source localization methods, like triangulation, are limited to simple planar structures.
  • Complex geometries and anisotropic materials in composite structures pose significant challenges for traditional AE analysis.
  • Existing analytical velocity models struggle with intricate structural designs and material properties.

Purpose of the Study:

  • To develop and validate a novel geodesic approach for accurate AE source localization in composite structures.
  • To address the limitations of conventional methods in handling complex geometries and anisotropic materials.
  • To provide a robust and practicable solution for AE event detection in advanced materials.

Main Methods:

  • A geodesic approach utilizing Voronoi construction is proposed for AE source location.
  • Geodesics are computed on the meshed surface using graph theory and Dijkstra's algorithm.
  • Virtual reverse wave propagation from sensors along geodesic paths identifies the AE source location.

Main Results:

  • The geodesic approach demonstrates suitability for AE source location in composite structures with arbitrary surfaces and discontinuities.
  • Experimental validation on composite plates of varying complexity confirms the method's efficacy.
  • The proposed method overcomes the geometric and material complexities that hinder traditional techniques.

Conclusions:

  • The geodesic approach offers a significant advancement in AE source localization for complex composite materials.
  • This method provides a reliable and efficient tool for structural health monitoring in advanced engineering applications.
  • The study validates the practical applicability of the geodesic method in real-world composite structures.