A phase reconstruction algorithm for Lamb wave based structural health monitoring of anisotropic multilayered composite plates

Jagannathan Rajagopalan, Krishnan Balasubramaniam, C. V. Krishnamurthy

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

Platelike structures, made of composites, are being increasingly used for fabricating aircraft wings and other aircraft substructures. Continuous monitoring of the health of these structures would aid the reliable operation of aircrafts. This paper considers the use of a Lamb wave based structural health monitoring (SHM) system to identify and locate defects in large multilayered composite plates. The SHM system comprises of a single transmitter and multiple receivers, coupled to one side of the plate that send and receive Lamb waves. The proposed algorithm processes the data collected from the receivers and generates a reconstructed image of the material state of the composite plate. The algorithm is based on phased addition in the frequency domain to compensate for the dispersion of Lamb waves. In addition, small deviations from circularity of the slowness curves of Lamb wave modes, due to anisotropy, are corrected for by assuming that the phase and group velocity directions coincide locally. Experiments were performed on an anisotropic multilayered composite plate containing a single defect. Reconstruction of the defect is carried out using data for a weakly anisotropic Lamb wave mode as a proof of concept of the proposed algorithm.

Original languageEnglish (US)
Pages (from-to)872-878
Number of pages7
JournalJournal of the Acoustical Society of America
Volume119
Issue number2
DOIs
StatePublished - Feb 2006
Externally publishedYes

Fingerprint

Lamb waves
structural health monitoring
composite materials
aircraft
defects
receivers
transmitter receivers
substructures
phase velocity
group velocity
wings
health
Monitoring
Waves
Health
deviation
anisotropy
curves
Defects

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

A phase reconstruction algorithm for Lamb wave based structural health monitoring of anisotropic multilayered composite plates. / Rajagopalan, Jagannathan; Balasubramaniam, Krishnan; Krishnamurthy, C. V.

In: Journal of the Acoustical Society of America, Vol. 119, No. 2, 02.2006, p. 872-878.

Research output: Contribution to journalArticle

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