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

Published online by Cambridge University Press:  03 February 2016

H. Gao  and
J. L. Rose
H. Gao
Affiliation:
hgao@innerspec.com, Research and Development, Innerspec Technologies, Lynchburg, Viginia, USA
J. L. Rose
Affiliation:
krp12@engr.psu.edu, Department of Engineering Science and Mechanics, Penn State University, Pennsylvania, USA
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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.

Type
Research Article
Information
The Aeronautical Journal , Volume 114 , Issue 1151 , January 2010 , pp. 49 - 56
Copyright
Copyright © Royal Aeronautical Society 2010 

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