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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 대한기계학회 Journal of Mechanical Science and Technology Journal of Mechanical Science and Technology Vol.20 No.12
- 발행연도
- 2006.12
- 수록면
- 2,147 - 2,158 (12page)
이용수
초록· 키워드
오류제보하기
The continuous wavelet transform (CWT) has a frequency-adaptive time-frequency tiling property, which makes it popular for the analysis of dispersive elastic wave signals. However, because the time-frequency tiling of CWT is not signal-dependent, it still has some limitations in the analysis of elastic waves with spectral components that are dispersed rapidly in time. The objective of this paper is to introduce an advanced time-frequency analysis method, called the dispersion-based continuous wavelet transform (D-CWT) whose time-frequency tiling is adaptively varied according to the dispersion relation of the waves to be analyzed. In the D-CWT method, time-frequency tiling can have frequency-adaptive characteristics like CWT and adaptively rotate in the time-frequency plane depending on the local wave dispersion. Therefore, D-CWT provides higher time-frequency localization than the conventional CWT. In this work, D-CWT method is applied to the analysis of dispersive elastic waves measured in waveguide experiments and an efficient procedure to extract information on the dispersion relation hidden in a wave signal is presented. In addition, the ridge property of the present transform is investigated theoretically to show its effectiveness in analyzing highly time-varying signals. Numerical simulations and experimental results are presented to show the effectiveness of the present method.
목차
1. Introduction
2. Dispersion-Based Continuous Wavelet Transform
3. Numerical Investigation
4. Experimental Verification
5. Conclusions
Acknowledgments
References
참고문헌 (23)
참고문헌 신청
Angrisani, L. and D'Arco, M., 2002, "A Measurement Method Based on a Modified Version of the Chirplet Transform for Instantaneous Frequency Estimation," IEEE Transactions on Instrumentation and Measurement, Vol.51, pp.704~711.
Auger, F. and Flandrin, P., 1995, "Improving the Readability of Time-Frequency and Time Scale Representations by the Reassignment Method," IEEE Transactions on Signal Processing, Vol.43, pp.1068~1089.
Baraniuk, R. G. and Jones, D. L., 1996, "Wigner-Based Formulation of the Chirplet Transform," IEEE Transactions on Signal Processing, Vol.44, pp.3129~3135.
Cho, S. H., Sun, K. H., Lee, J. S. and Kim, Y. Y., 2004, "The Measurement of Elastic Waves in a Nonferromagnetic Plate by a Patch-Type Magnetostrictive sensor," Proceedings of the SPIE, Vol.5384, pp.120~130.
Daubechies, I., 1992, Ten Lectures on Wavelets, Philadelphia: SIAM.
Auger, F. and Flandrin, P., 1995, "Improving the Readability of Time-Frequency and Time Scale Representations by the Reassignment Method," IEEE Transactions on Signal Processing, Vol.43, pp.1068~1089.
Baraniuk, R. G. and Jones, D. L., 1996, "Wigner-Based Formulation of the Chirplet Transform," IEEE Transactions on Signal Processing, Vol.44, pp.3129~3135.
Cho, S. H., Sun, K. H., Lee, J. S. and Kim, Y. Y., 2004, "The Measurement of Elastic Waves in a Nonferromagnetic Plate by a Patch-Type Magnetostrictive sensor," Proceedings of the SPIE, Vol.5384, pp.120~130.
Daubechies, I., 1992, Ten Lectures on Wavelets, Philadelphia: SIAM.
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