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Abstract: It
is difficult to detect flaws in multi-layered structures of aircraft
fuselage lap splices. Pulsed eddy current (PEC) is the effective method
that has been demonstrated to be capable of quantifying this defect.
Time frequency analysis techniques are used to quantify cracks appearing
in aircraft structure. With the purpose of overcoming the problem of low
accuracy of PEC in the cracks classification, a new feature, termed as
frequency spectrum separating point, is proposed to enhance the accuracy
in classification of defects. The agreement between theory and
experiment shows that the present method is correct.
Key words: Scanned
pulsed eddy current Aircraft structure Crack Quantification Defect
classification
CLC No: TG115
Received
20050227, received in revised form 20050710 |