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UBC Theses and Dissertations

The classification of acoustic emission signals via artificial neural network Yang, Jian


Automatic identification of wood species is a long desired goal in the pulp and paper industry. Motivated by this, researchers have investigated Pattern Recognition (PR) for the classification of wood chip species based on acoustic emission signals. In this thesis, a new Artificial Neural Network (ANN) approach is proposed to perform this task. One of the purposes of the thesis is to explore the connection between traditional methods of statistics and modern approaches of neural networks regarding pattern recognition. We attempt to understand how the neural networks perform signal processing functions such as the Karhunen-Loeve Transform (KLT) and pattern recognition functions such as the Principal Component Analysis (PCA). The configuration of the classifier is a multilayer feed forward network in which the supervised and unsupervised learning algorithms are implemented. Based on the established orthogonal data space, feature extraction and data compression are accomplished through the training process. The reconstructed data, which is in orthogonal and compressed form with maximal variance, are used to improve the classification efficiency. Since the primary goal of the thesis is to identify wood species from their acoustic emission, simulations are used to characterize classification accuracy, classification efficiency, noise immunity, and generalization capability.

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