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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Zhong, Shuncong Oyadiji, S. Olutunde |
| Copyright Year | 2007 |
| Abstract | In this paper, a new wavelet-based approach for crack identification in beam-like structures is presented and applied to simply-supported beams with single or multiple cracks. A novel damage index, based on finding the difference between two sets of detail coefficients obtained by the use of the Stationary Wavelet Transform (SWT) of two reconstructed sets of modal displacement data of the cracked beam-like structure, is proposed for single crack detection or multiple crack detection. These two sets of mode shape data represent the left half and the modified right half of the modal data of the structure. Currently, SWT is widely used in the field of image processing for image noise reduction and image quality improvement. However, because it can provide an accurate estimate of the variances at each scale and facilitate the identification of salient features in a signal, SWT has great potential in the field of structural damage detection. In this paper, the modal responses of the damaged simply supported beams used are computed using the finite element method (FEM). The modal data generate is decomposed by SWT into a smooth curve, called approximation coefficient, and detail coefficient. It is shown that the detail coefficient includes crack information that is useful for structural damage detection. Therefore, a novel damage index, the difference of the SWT detail coefficients of two reconstructed sets of modal displacement data, is proposed and employed. The numerical simulation results show that the proposed wavelet-based method has a good anti-noise ability and it does not require the modal parameters of an intact structure as a baseline for crack detection. Therefore, it can be recommended for real applications in structural health monitoring and damage detection. |
| Sponsorship | Design Engineering Division and Computers and Information in Engineering Division |
| Starting Page | 461 |
| Ending Page | 469 |
| Page Count | 9 |
| File Format | |
| ISBN | 0791848027 |
| DOI | 10.1115/DETC2007-35632 |
| e-ISBN | 0791838064 |
| Volume Number | Volume 1: 21st Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C |
| Conference Proceedings | ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference |
| Language | English |
| Publisher Date | 2007-09-04 |
| Publisher Place | Las Vegas, Nevada, USA |
| Access Restriction | Subscribed |
| Subject Keyword | Wavelet transforms Approximation Computer simulation Image processing Crack detection Fracture (materials) Structural health monitoring Finite element methods Noise control Displacement Mode shapes Noise (sound) Wavelets Simply supported beams Signals Damage |
| Content Type | Text |
| Resource Type | Article |
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