A new wave front shape-based approach for acoustic source localization in an anisotropic plate without knowing its material properties

Novonil Sen, Tribikram Kundu

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

Estimating the location of an acoustic source in a structure is an important step towards passive structural health monitoring. Techniques for localizing an acoustic source in isotropic structures are well developed in the literature. Development of similar techniques for anisotropic structures, however, has gained attention only in the recent years and has a scope of further improvement. Most of the existing techniques for anisotropic structures either assume a straight line wave propagation path between the source and an ultrasonic sensor or require the material properties to be known. This study considers different shapes of the wave front generated during an acoustic event and develops a methodology to localize the acoustic source in an anisotropic plate from those wave front shapes. An elliptical wave front shape-based technique was developed first, followed by the development of a parametric curve-based technique for non-elliptical wave front shapes. The source coordinates are obtained by minimizing an objective function. The proposed methodology does not assume a straight line wave propagation path and can predict the source location without any knowledge of the elastic properties of the material. A numerical study presented here illustrates how the proposed methodology can accurately estimate the source coordinates.

Original languageEnglish (US)
Pages (from-to)20-32
Number of pages13
JournalUltrasonics
Volume87
DOIs
StatePublished - Jul 2018

Keywords

  • Acoustic source localization
  • Anisotropic structures
  • Elastic wave propagation
  • Elliptical wave front
  • Non-elliptical wave front
  • Wave front shape

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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