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Defect classification in pipes by neural networks using multiple guided ultrasonic wave features extracted after wavelet processing
- Source :
- Journal of Pressure Vessel Technology. August, 2005, Vol. 127 Issue 3, p294, 10 p.
- Publication Year :
- 2005
-
Abstract
- This paper casts pipe inspection by ultrasonic guided waves in a feature extraction and automatic classification framework. The specific defect under investigation is a small notch cut in an ASTM-A53-F steel pipe at depths ranging from 1% to 17% of the pipe cross-sectional area. A semi-analytical finite element method is first used to model wave propagation in the pipe. In the experiment, reflection measurements are taken and six features are extracted from the discrete wavelet decomposition of the raw signals and from the Hilbert and Fourier transforms of the reconstructed signals. A six-dimensional damage index is then constructed, and it is fed to an artificial neural network that classifies the size and the location of the notch. Overall the wavelet-based multifeature analysis demonstrates good classification performance and robustness against noise and changes in some of the operating parameters. [DOI: 10.1115/1.1990213] Keywords: Pipe Inspection, Guided Waves, Wavelet Transform, Feature Extraction, Neural Networks
Details
- Language :
- English
- ISSN :
- 00949930
- Volume :
- 127
- Issue :
- 3
- Database :
- Gale General OneFile
- Journal :
- Journal of Pressure Vessel Technology
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.136458187