SHM in complex structural components

Anthony J. Croxford, Paul D. Wilcox, Charles R.P. Courtney, Bruce W. Drinkwater

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding

4 Citations (SciVal)


The use of permanently attached arrays of sensors has made it clear that guided waves can be used for the SHM of structures. The approaches developed have relied on the use of reference signal subtraction to indicate changes to the state of the structure, such as the appearance of damage. The limit of performance of any system is defined by the post subtraction noise.In order to confirm the basic principles at work the majority of this work has been carried out on simple metallic plates. While important to confirm the levels of understanding, this is not sufficient for practical use. This paper looks at the application of SHM techniques in more complex structures, more typical of those any system would be used on in practise. A rib from a BaE 146 aircraft is used to demonstrate the practical difficulties of applying guided wave SHM methods to densely featured structures. A model system comprising a plate with a single stringer is used to demonstrate a method for normalizing signals to give responses directly related to the scattering properties of the change in the system, mitigating the effect of the position of the change, and a method is proposed to generalize the approach to complex systems. Preliminary tests in the region of the stringer are used to identify the experimental challenges to realizing the calibration on complex systems.

Original languageEnglish
Title of host publicationHealth Monitoring of Structural and Biological Systems 2009
Publication statusPublished - 2009
EventHealth Monitoring of Structural and Biological Systems 2009 - San Diego, CA, USA United States
Duration: 9 Mar 200912 Mar 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceHealth Monitoring of Structural and Biological Systems 2009
Country/TerritoryUSA United States
CitySan Diego, CA

Bibliographical note

Copyright 2009 Elsevier B.V., All rights reserved.


  • Calibration
  • Complex Structures
  • Guided Waves
  • SHM

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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