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Abstrakty
A method for crack detection in beams by time-frequency analysis of flexural waves is described. Two different time-frequency representations, namely the continuous wavelet transform and the smoothed pseudo-Wigner distribution are employed. Simulated and measured exural waves in a cracked beam are analysed and both the location and size of the crack are accurately determined. The location of the crack is estimated using the arrival time of reflected waves with different group velocities. The ratio of the reflected wave energy to the incident wave one is calculated and used as an indicator of the crack size. Wave experiments in a slender brass beam are in good agreement with predictions verifying the effciency of the method. In view of the results obtained, the advantages and shortcomings of the time-frequency representations employed are presented and discussed.
Wydawca
Czasopismo
Rocznik
Tom
Strony
941--954
Opis fizyczny
Bibliogr. 11 poz., rys., tab.
Twórcy
autor
- Aristotle University of Thessaloniki, Faculty of Engineering, Physics Division GR-54124, Thessaloniki, Greece
autor
- Aristotle University of Thessaloniki, Faculty of Engineering, Mechanics Division
autor
- Aristotle University of Thessaloniki, Faculty of Engineering Department of Electrical and Computer Engineering Division of Telecommunications
autor
- Aristotle University of Thessaloniki, Faculty of Engineering, Physics Division GR-54124, Thessaloniki, Greece
autor
- Aristotle University of Thessaloniki, Faculty of Engineering, Physics Division GR-54124, Thessaloniki, Greece
Bibliografia
- [1] MALLAT S., Wavelet Tour of Signal Processing, Academic Press, New York 1998.
- [2] T. ONSAY, A. G. HADDOW, Wavelet transform analysis of transient wave propagation in a dispersive medium, Journal of the Acoustical Society of America, 95, 3, 1441-1449 (1994).
- [3] H. INOUE, K. KISHIMOTO, T. SHIBUYA, Experimental wavelet analysis of flexural waves in beams, Experimental Mechanics, 36, 3, 212-217 (1996).
- [4] K. KISHIMOTO, H. I. M. HAMADA, T. SHIBUYA, Time-frequency analysis of dispersive waves by means of wavelet transform, Journal of Applied Mechanics, Transactions of the ASME, 62, 4, 841-846 (1995).
- [5] Y. Y. KIM, E. H. KIM, Effectiveness of continuous wavelet transform in the analysis of some elastic dispersive waves, Journal of the Acoustical Society of America, 110, 1, 86-94 (2001).
- [6] J. Y. TIAN, Z. LI, X. SU, Crack detection in beams by wavelet analysis of transient flexural waves, Journal of Sound and Vibration, 261, 4, 715-727 (2003).
- [7] S. T. QUEK, Q. WANG, L. ZHANG, K. H. ONG, Practical issues in the detection of damage in beams using wavelets, Smart Materials and Structures, 10, 5, 1009-1017 (2001).
- [8] Z. LI, S. XIA, J. WANG, X. SU, Damage detection of cracked beams based on wavelet transform, International Journal of Impact Engineering, 32, 7, 1190-1200 (2006).
- [9] I. K. KIM, Y. Y. KIM, Damage size estimation by the continuous wavelet ridge analysis of dispersive bending waves in beam, Journal of Sound and Vibration, 287, 4-5, 707-722 (2005).
- [10] COHEN L., Time-frequency distributions - a review, Proceedings of the IEEE, 77, 7, 941-981 (1989).
- [11] OKAMURA H., LIU H.W., SHU C.-S., LIEBOWITZ H., A cracked column under compression, Engineering Fracture Mechanics, 1, 3, 547-564 (1969).
Typ dokumentu
Bibliografia
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