Learning material defect patterns by separating mixtures of independent component analyzers from NDT sonic signals
Autor: | Addisson Salazar, Luis Vergara, Raul Llinares |
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Rok vydání: | 2010 |
Předmět: |
Signal processing
Engineering Artificial neural network business.industry Mechanical Engineering Aerospace Engineering Perceptron Linear discriminant analysis Independent component analysis Computer Science Applications Mixture theory Control and Systems Engineering Nondestructive testing Component (UML) Signal Processing business Algorithm Civil and Structural Engineering |
Zdroj: | Mechanical Systems and Signal Processing. 24:1870-1886 |
ISSN: | 0888-3270 |
DOI: | 10.1016/j.ymssp.2010.01.007 |
Popis: | This paper introduces the application of independent component analysis mixture modelling (ICAMM) in non-destructive testing (NDT). The application consists of discriminating patterns for material quality control from homogeneous and defective materials inspected by impact-echo testing. This problem is modelled as a mixture of independent component analysis (ICA) models, representing a class of defective or homogeneous material by an ICA model whose parameters are learned from the impact-echo signal spectrum. These parameters define a kind of particular signature for the different defects. The proposed procedure is intended to exploit to the maximum the information obtained with the cost efficiency of only a single impact. To illustrate this capability, four levels of classification detail (material condition, kind of defect, defect orientation, and defect dimension) are defined, with the lowest level of detail having up to 12 classes. The results from several 3D finite element models and lab specimens of an aluminium alloy that contain defects of different shapes and sizes in different locations are included. The performance of the classification by ICA mixtures is compared with linear discriminant analysis (LDA) and with multi-layer perceptron (MLP) classification. We demonstrate that the mass spectra from impact-echo testing fit ICAMM, and we also show the feasibility of ICAMM to contribute in NDT applications. |
Databáze: | OpenAIRE |
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