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- Title
NONLINEAR DYNAMICAL ANALYSIS OF ABRUPT WELDING TEXTURE CHANGE.
- Authors
Shuguang Wu; Yiqing Zhou
- Abstract
Purpose. Owing to its diversity, the texton of weld image is not very salient, and weld defects are difficult to detect automatically. The goal of this work is to identify the weld image texture change for such flaw detection and to determine the optimal number of elements, in particular, in a chaotic dynamic mode. Methodology. The texture is characterized by the approximate entropy, which is calculated in phase space. The time series are reconstructed with the entropy of sub-image values for choosing the proper texture parameters. Applying the chaotic theory, we proposed the abrupt texture change area detection method. Findings. We first get the approximate entropy in phase space, and then by using the abrupt texture change area detection method, we obtained the abrupt texture change area. Originality. We pursued a study of the abrupt texture change area. We discussed a reconstruction of the principle of time series, approximate entropy mutation threshold determination. The research on this aspect has not been conducted before. Practical value. In practice,itis essentialto reconstructthe time series with the entropy ofsub-image valuesin a first step, these results of approximate entropy in phase space are much more accurate within abrupt texture change areas.
- Subjects
WELDING defects; ENTROPY minimization; WELDING inspection; QUALITY standards; DYNAMIC models
- Publication
Scientific Bulletin of National Mining University, 2016, Issue 5, p125
- ISSN
2071-2227
- Publication type
Article