Detection of structural heteregoneities by the wavelet technique

• Autorzy: Marcinowski J.
• Języki publikacji: EN

Abstrakty

EN

This paper deals with a special technique of a structural damage detection. To detect the location of the damage the source signal in the form of a structural response signal must be known. A displacement, strains or temperature distribution measured in a structural member are examples of such signals. The typical signal registered on an actual structure is not distinct enough to facilitate the localization of structural or material heterogeneities in a structural member. The wavelet anaIysis acts as a kind of a magnifying glass. It enables the detection of locaI disturbances not visible for the naked eye. In this paper, the effectiveness of discrete wavelet transform in a determination of local disturbances of a source signal caused by structural heterogeneities was presented. The source signal was obtained from the numerical simulation of bending of steel beam in which a narrow notch was cut. It was shown that as a result of the procedure adopted the location of the notch was determined very accurately.

Słowa kluczowe

EN

damage detection; structural heterogeneities; wavelet transform; numerical simulation

PL

wytrzymałość materiałów; dyskretna transformacja fali elementarnej

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2007
• Tom: Vol. 12, no 2
• Strony: 487--495
• Opis fizyczny: Bibliogr. 8 poz., rys., wykr.

Twórcy

autor

Marcinowski J.

• University of Zielona Góra, Institute of Structural Engineering ul. prof. Z. Szafrana 2,65-516 Zielona Góra, POLAND,

Bibliografia

• Białasiewicz J. (2000): Wavelets and approximations (in Polish). - Warszawa: WNT.
• Chang Chih-Chieh and Chen Lien-Wen (2005): Detection of the location and size of cracks in the multiple cracked beam by spatial wavelet based approach. - Mechanical Systems and Signal Processing, vol.19, No.1, pp.139-155.
• Daubechies I., (1990): The wavelet Transform, Time-Frequency Localization and Signal Analysis. - IEEE Trans. On Information Theory, vol.36, pp.961-1005.
• Douka E., Loutridis S. and Trochidis A. (2003): Crack identification in beams using wavelet analysis. - International Journal of Solids and Structures, vol.40, No.13-14, pp.3557-3569.
• Douka E., Loutridis S. and Trochidis A. (2004): Crack identification in plates using wavelet analysis. - Journal of Sound and Vibration, vol.270, No.1-2, pp.279-295.
• Loutridis S., Douka E. and Trochidis A. (2004): Crack identification in double-cracked beams using wavelet analysis. - Journal of Sound and Vibration, vol.277, No.4-5, pp.1025-1039.
• Mallat S. (1989): A Theory for Multiresolution Signal Decomposition: the Wavelet Representation. - IEEEE Trans. Pattern Anal. and Machine Intell., vol.11, pp.674-693.
• Wang Q. and Deng X. (1999): Damage detection with spatial wavelets. - International Journal of Solids and Structures, vol.36, pp.3443-3468.