wavelet analysis of crack detection experiment for aluminum alloy board

Paper number

IAC-10.C2.5.11

Author

Dr. Peng Weibin, Beijing Institute of Astronautical Systems Engineering, China

Year

2010

Abstract

A crack identification experiment for aluminum alloy board was pesented in this article. Several optical Fibers with Bragg Grating(FBG)sensors were bonded on the surface, which were used to measure static strain around the crack in the plate, and wavelet transform was applied to the received strain signal. The slight strain change near crack area was shown distinctly by low scale wavelet transform coefficients. Various crack sizes were studied, which proved the 
validity of using wavelet analysis to identify whether there was a crack and what is the size of the crack. A index that
correlated low scale wavelet transform coefficients with crack location and size was introuduced. By the experiment,
we realized that the abrupt change of the index could be used to localize crack, and the local maximum value of index increased with 
crack size increase.

Abstract document

IAC-10.C2.5.11.brief.pdf

Manuscript document

IAC-10.C2.5.11.pdf (🔒 authorized access only).

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