Passive impact localisation for the structural health monitoring of new airframe materials

Jacob Ward*, Anthony Croxford, Christophe Paget

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

2 Citations (Scopus)

Abstract

This experimental work considers the use of permanently attached sensors for the detection and location of impacts to a carbon fibre reinforced plastic panel with stringers. Deterministic knowledge of the propagation of Lamb waves in the structure is not used. Instead a statistical measure of the signal is used to determine the arrival time of elastic waves propagating in the structure as a result of the impact. A comparison is made between a conventional method and the statistical method. The conventional method, which has been routinely used in industry for acoustic emission imaging, uses the timing of a peak in the recorded signal. The statistical method uses the Rayleigh maximum likelihood estimator. The statistical method is shown to provide both more precise and robust estimates of the elastic wave arrival time. An array of just four sensors is used to locate the impacts. The accuracy of the localisations is used to visualise the effectiveness of the two methods for the low sensor density used. Low sensor density is necessary for minimising system weight and cost. The equivalent net sensor density used in this experiment was five sensors permeter squared. Carbon fibre reinforced plastic is today used for both exterior surfaces and primary structure of airframes entering service. The industrial relevance of this work is to mitigate the diminishing role of visual inspection for evaluating the health of aerospace structures, where impact damage may not be visible.

Original languageEnglish
Title of host publication11TH ANGLO-FRENCH PHYSICAL ACOUSTICS CONFERENCE (AFPAC 2012)
EditorsN Saffari, M Lowe, A Lhemery
Place of PublicationBRISTOL
PublisherDeutsche Physikalische Gesellschaft & IOP Publishing Ltd
Number of pages11
ISBN (Print)*****************
DOIs
Publication statusPublished - 2013
Event11th Anglo-French Physical Acoustics Conference (AFPAC) - Brighton, United Kingdom
Duration: 18 Jan 201220 Jan 2012

Publication series

NameJournal of Physics Conference Series
PublisherIOP PUBLISHING LTD
Volume457
ISSN (Print)1742-6588

Conference

Conference11th Anglo-French Physical Acoustics Conference (AFPAC)
CountryUnited Kingdom
Period18/01/1220/01/12

Keywords

  • ACOUSTIC-EMISSION
  • DAMAGE

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