Proceedings of the Korean Society for Noise and Vibration Engineering Conference (한국소음진동공학회:학술대회논문집)
- 2004.11a
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- Pages.311-316
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- 2004
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- 1598-2548(pISSN)
Application of a Continuous Wavelet Transform to the Impact Location Estimation in Plate Type Structures
연속웨이블렛변환을 이용한 평판구조물에서의 충격위치 추정
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Park, Jin-Ho
(Korea Atomic Energy Research Institute) ;
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Lee, Jeong-Han
(Korea Atomic Energy Research Institute) ;
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Park, Gee-Yong
(Korea Atomic Energy Research Institute)
- Published : 2004.11.01
Abstract
For the location estimation in the conventional LPMS(Loose Parts Monitoring System), it is popular to employ a group delay among the acoustic sensors installed within a 3 ft range from the impact source. However, there exists inherent error in determining the arrival time differences of the generated wave group among the neighboring sensors. To overcome this problem in this study, the two dimensional approach has been proposed and applied to effectively estimate the arrival time differences by using a continuous wavelet transform which is one of the linear time-frequency analysis methods. The experiment has been performed to both the plate model and the real steam generator in a nuclear power plant. It is expected that the reliability of the location estimation could be enhanced when the proposed time-frequency method is introduced into the LPMS system.
Keywords
- Group delay;
- Impact location estimation;
- Time-frequency analysis;
- Continuous Wavelet Transform;
- Loose Parts Monitoring System