Published 2014
“…Interpretation of propagated high frequency stress wave signals in steel tubes is noteworthy for
defect identification.This paper demonstrated a successful new
approach for autonomous
defect detection in steel tubes using
classification analysis of high frequency stress waves.
Classification analysis using Principal Component
Analysis (PCA)
algorithm involved feature extraction to reduce the dimensionality of the complex stress waves propagation path.Two
defective tubes containing a slot
defect of different orientation and a reference tube are inspected using Vibration Impact Acoustic Emission (VIAE) technique.The tubes are externally excited using impact
hammer.The variation of stress wave transmission path are captured by high frequency Acoustic Emission sensor.The propagated stress waves in the steel tubes are classified
using PCA
algorithm.
Classification results are graphically illustrated using a dendrogram that
demonstrated the arrangement of the natural
clusters of the stress wave signals.The inspection of steel tubes showed good recognition of
defect in circumferential and longitudinal orientation.This approach successfully classified stress wave signals from VIAE testing and provide fast and accurate
defect identification of
defective steel tubes from non-
defective tubes.
…”
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