Calculation of guided wave dispersion characteristics using a three-transducer measurement system

Borja Hernandez Crespo, Charles R.P. Courtney, Bhavin Engineer

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Guided ultrasonic waves are of significant interest in the health monitoring of thin structures, and dispersion curves are important tools in the deployment of any guided wave application. Most methods of determining dispersion curves require accurate knowledge of the material properties and thickness of the structure to be inspected, or extensive experimental tests. This paper presents an experimental technique that allows rapid generation of dispersion curves for guided wave applications when knowledge of the material properties and thickness of the structure to be inspected are unknown. The technique uses a single source and measurements at two points, making it experimentally simple. A formulation is presented that allows calculation of phase and group velocities if the wavepacket propagation time and relative phase shift can be measured. The methodology for determining the wavepacket propagation time and relative phase shift from the acquired signals is described. The technique is validated using synthesized signals, finite element model-generated signals and experimental signals from a 3 mm-thick aluminium plate. Accuracies to within 1% are achieved in the experimental measurements.

Original languageEnglish
Article number1253
JournalApplied Sciences (Switzerland)
Volume8
Issue number8
Early online date29 Jul 2018
DOIs
Publication statusPublished - 31 Aug 2018

Keywords

  • Dispersion curves
  • Group velocity
  • Guided waves
  • Lamb wave
  • Phase velocity
  • Signal processing

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

Fingerprint Dive into the research topics of 'Calculation of guided wave dispersion characteristics using a three-transducer measurement system'. Together they form a unique fingerprint.

Cite this