Damage detection in beams using wavelet transform on higher vibration modes

Rucka, M.

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Tytuł artykułu

Damage detection in beams using wavelet transform on higher vibration modes

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Rucka M.

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Wykrywanie uszkodzeń w konstrukcjach belkowych za pomocą transformaty falkowej na bazie wyższych postaci drgań

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Abstrakty

Technical difficulties prevented so far wider applications of higher mode shapes in damage detection. Yet these modes carry on a lot of, so much needed, information on damage inflicted to a structure. However, recent scanning laser-based vibration measurement techniques allow one to utilize these higher modes in damage detection effectively. This paper deals with the wavelet-based damage detection technique on a cantilever beam with damage in the form of a single notch of depth 20%, 10% and 5% of the beam height. The purpose of the study is to present the results of experimental and numerical analyses of damage detection based on higher order modes. The first eight modes are considered and the influence of the mode order on the effectiveness of damage detection by the continuous wavelet transform is analysed in detail.

Niniejsza praca poświęcona jest technice diagnostyki konstrukcji bazującej na transformacie falkowej. Badany obiekt to belka wspornikowa z uszkodzeniami w firmie nacięcia o głębokości 20%, 10% oraz 5% wysokości belki. Pomiary postaci drgań wykonano za pomocą nowoczesnego wibrometru laserowego. Celem pracy jest przed- stawienie eksperymentalnych i numerycznych analiz wpływu wyższych postaci drgań na efektywność wykrywania uszkodzeń metodą ciągłej transformaty falkowej.

Słowa kluczowe

damage detection wavelet transform higher vibration modes scanning laser vibrometer

Wydawca

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Czasopismo

Journal of Theoretical and Applied Mechanics

Rocznik

2011

Tom

Vol. 49 nr 2

Strony

399--417

Opis fizyczny

Bibliogr. 30 poz., rys.

Twórcy

autor

Rucka M.

Gdansk University of Technology, Faculty of Civil and Environmental Engineering, Gdańsk, Poland, mrucka@pg.gda.pl

Bibliografia

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3. Chang C.-C., Chen L.-W., 2003, Vibration damage detection of a Timoshenko beam by spatial wavelet based approach, Applied Acoustics, 64, 1217-1240
4. Chang C.-C., Chen L.-W., 2004, Damage detection of a rectangular plate by spatial wavelet based approach, Applied Acoustic, 65, 819-832
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9. Knitter-Piątkowska A., Pozorski Z., Garstecki A., 2006, Application of discrete wavelet transformation in damage detection. Part I: Static and dynamic experiments, Computer Assisted Mechanics and Engineering Sciences (CAMES), 13, 21-38
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30. Ziopaja K., Pozorski Z., Garstecki A., 2006, Application of discrete wavelet transformation in damage detection. Part II: Heat transfer experiments, Computer Assisted Mechanics and Engineering Sciences (CAMES), 13, 39-51

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Bibliografia

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