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Development of Non-destructive Evaluation Method for Composite Structures using Tapping Sound  

황준석 (서울대학교 기계항공공학부, 대학원)
김승조 (서울대학교 기계항공공학부)
Publication Information
Composites Research / v.17, no.1, 2004 , pp. 1-9 More about this Journal
Abstract
A new non-destructive evaluation method using tapping sound is proposed. This method, named Tapping Sound Analysis, is using the difference between tapping sound data of healthy structure and defective structure as the criteria of determination of internal defect of composite structure. For the characterization of tapping sound, a feature extraction method based on wavelet packet transform is proposed. And a feature index is defined for the decision of existence of internal defects. To prove the possibility of proposed method as a non-destructive evaluation method, experimental study is performed. The tapping sound data of healthy structure and defective structure are measured and compared based on the proposed decision method. The experimental results showed that the feature index is a good indicator for the determination of internal defects.
Keywords
non-destructive evaluation; tapping sound; wavelet packet transform; composite structure;
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