Goodness dispersion curves for ultrasonic guided wave based SHM: A sample problem in corrosion monitoring

H. Gao, J. L. Rose

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Ultrasonic guided wave techniques have great potential for structural health monitoring applications. Appropriate mode and frequency selection is the basis for achieving optimised damage monitoring performance. In this paper, several important guided wave mode attributes are introduced in addition to the commonly used phase velocity and group velocity dispersion curves while using the general corrosion problem as an example. We first derive a simple and generic wave excitability function based on the theory of normal mode expansion and the reciprocity theorem. A sensitivity dispersion curve is formulated based on the group velocity dispersion curve. Both excitability and sensitivity dispersion curves are verified with finite element simulations. Finally, a goodness dispersion curve concept is introduced to evaluate the tradeoffs between multiple mode selection objectives based on the wave velocity, excitability and sensitivity.

Original languageEnglish (US)
Pages (from-to)49-56
Number of pages8
JournalAeronautical Journal
Volume114
Issue number1151
DOIs
StatePublished - Jan 2010

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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