Application of 1-D and 2-D discrete wavelet transform to crack identification in statically and dynamically loaded plates

• Autorzy: Knitter-Piatkowska Anna , Guminiak Michał

Identyfikatory

DOI

10.24423/EngTrans.1115.20200304

• Języki publikacji: EN

Abstrakty

EN

The paper presents the problem of damage detection in thin plates while considering the influence of static and dynamic characteristics, especially with regard to the modes of vibration as well as the excitation by static loads. The problem of Kirchhoff plate bending is described and solved by the Boundary Element Method (BEM). Rectangular plates supported on boundary or plates supported on boundary and resting on the internal columns are examined. A defect is introduced by the additional edges forming a crack in the plate domain. The analyses of static and dynamic structural responses are carried out with the use of Discrete Wavelet Transform (DWT). Signal decomposition according to the Mallat pyramid algorithm is applied. To obtain a more adequate input function subjected to DWT the white noise disturbing the signal is considered together with the structural response. In the dynamic experiments the plate undergoes vibrations similar to natural modes. The measured variables are static deflections and vertical displacement amplitudes. All of them are established at internal collocation points distributed alongside the line parallel to selected plate edge.

Słowa kluczowe

EN

damage detection; kirchhoff plates; boundary element method; discrete wavelet transform

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Engineering Transactions
• Rocznik: 2020
• Tom: Vol. 68, iss. 2
• Strony: 137--157
• Opis fizyczny: Bibliogr. 17 poz., rys., tab., wykr.

Twórcy

autor

Knitter-Piatkowska Anna

• Institute of Structural Analysis Poznan University of Technology Piotrowo 5, 60-965 Poznan, Poland

autor

Guminiak Michał

• Institute of Structural Analysis Poznan University of Technology Piotrowo 5, 60-965 Poznan, Poland

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).