Digital Filters and Signal Processing
Digital Filters and Signal Processing
A Neural Network Diagnosis Approach for Analog Circuits
Applied Intelligence
Adaptive Blind Signal and Image Processing: Learning Algorithms and Applications
Adaptive Blind Signal and Image Processing: Learning Algorithms and Applications
Blind separation of sources that have spatiotemporal variance dependencies
Signal Processing - Special issue on independent components analysis and beyond
Stress strain modeling by transformed equations of ultrasonic wave
WSEAS Transactions on Mathematics
Stress strain modeling by transformed equations of ultrasonic wave
WSEAS Transactions on Mathematics
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The design of Non-Destructive Testing systems for fault detection in long and not accessible pipelines is an actual task in the industrial and civil environment. At this purpose the diagnosis based on the propagation of guided ultrasonic waves along the pipes offers an attractive solution for the fault identification and classification. The authors studied this problem by means of suitable Artificial Neural Network models. Numerical techniques have been used to model different kinds of pipes and faults, and to obtain several returning echoes containing the fault information. Two kinds of excitation waves have been used: longitudinal and torsional wave modes. The obtained signals have been processed in order to filter the noise, to reduce the data dimensionality, and to compute suitable features. The features selected from the signals can be further processed in order to limit the size of the Neural Network models without loss of information. At this purpose, the Principal Component Analysis has been investigated. Finally, the selected features have been used as input for the Neural Network models. In this paper, traditional feed-forward, Multi Layer Perceptron networks have been used to classify position, width, and depth of the defects.