Structural damage identification of plates based on modal data using 2D discrete wavelet transform

Bagheri, Abdollah; Amiri, G. Ghodrati; Khorasani, Mohsen Kariman; Bakhshi, Hossein

doi:10.12989/sem.2011.40.1.013

Cited by 30 publications

(11 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two-dimensional WT was obtained by the product of one-dimensional WT. Basic functions of the two-dimensional WT are two-dimensional mother wavelets including ψ H ( x , y ) , ψ V ( x , y ) , and ψ D ( x , y ) ; and a scaling function ϕ ( x , y ) as follows (Bagheri et al, 2011)…”

Section: Multi-resolution Transformsmentioning

confidence: 99%

“…By applying the two-dimensional WT on signal f ( x , y ) for the first level, four subsignals are obtained. These subsignals include a level- j approximation, level- j horizontal detail, level- j vertical detail, and level- j diagonal detail of signal (Bagheri et al, 2011). This procedure is continued in approximation part of the signal.…”

Section: Multi-resolution Transformsmentioning

confidence: 99%

See 1 more Smart Citation

Comparisons of wavelets and contourlets for vibration-based damage identification in the plate structures

Vafaie

Salajegheh

2019

Advances in Structural Engineering

View full text Add to dashboard Cite

The objective of the present study is to compare a new approach based on contourlet transform and a traditional method based on wavelet transform to demonstrate curve damages in plate structures. The contourlet transform approach, as a novel two-dimensional development of wavelet transform, was extended to deal with inherent restrictions of wavelets. According to previous studies, wavelets have indicated poor performance to detect curve damages due to its basic elements. Therefore, this study utilized contourlet transform as a new method having an efficient performance to display this kind of discontinuities. In this research, contourlet transform and wavelet transform have been applied to a plate using four fixed boundary conditions including circle damages with arbitrary specifications and location in order to demonstrate their performance in damage identification. Comparing damage shape attained from contourlet transform and wavelet transform, it was revealed that contourlet transform could be utilized as an accessible and useful technique to detect damage with curvature.

show abstract

Section: Multi-resolution Transformsmentioning

confidence: 99%

Section: Multi-resolution Transformsmentioning

confidence: 99%

Comparisons of wavelets and contourlets for vibration-based damage identification in the plate structures

Vafaie

Salajegheh

2019

Advances in Structural Engineering

View full text Add to dashboard Cite

show abstract

“…However, they could not assess the level of damage [7]. In 2011, Bagheri et al proposed a new method for detection of linear flaws in plate structures by 2D discrete wavelet transform [8].…”

Section: Introductionmentioning

confidence: 99%

Signal processing based damage detection of concrete bridge piers subjected to consequent excitations

Naderpour¹,

Ezzodin²,

Kheyroddin³

et al. 2017

J. vibroeng.

View full text Add to dashboard Cite

Damage detection at an early stage is of great importance especially for infrastructures since the cost of repair is considerably less than that of reconstruction. The change in stiffness and frequency could obviously indicate the occurrence of damage and its severity. Wavelet transform is a powerful mathematical tool for signal processing which provides more details compared to Fourier transform. In this paper, a model-free output-only wavelet-based damage detection analysis has been performed in order to achieve perturbation of detailed function of acceleration response in bridge piers. First, a nonlinear time-history finite element analysis was performed using 9 consequent earthquake records; from which, time-history acceleration response was derived. Also pushover and hysteresis curves were drawn based on the results. Furthermore, applying wavelet transform to structural response, some irregularities appeared in decomposed detailed function which imply on damage presence in the models. Finally, peak values of details could lead us to time instants of damage.

show abstract

“…Since the introduction of wavelet denoising, satisfactory performance has been shown and has been applied in many research areas. [11][12][13] In some papers, 11,14,15 researchers have compared the empirical Bayes shrinking method, the universal hard threshold and the soft shrinking rule. Using the empirical Bayes shrinking method, not all but most of the noise can be eliminated, and the main spatial characteristics of the signal can be maintained.…”

Section: Introductionmentioning

confidence: 99%

Vibration analysis for slab track at different train speeds using Bayes wavelet denoising

Yue

Wang

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

With increasing train speed, it is necessary to study the relation between slab track vibration and travelling speed. In this paper, a wireless sensor network system is deployed on a typical ballastless slab track in China, which uses acceleration nodes to collect vibration information when the train is passing by at different constant speeds. Then, after comparing the denoising effects of a hard threshold method, a soft threshold method and a Bayes wavelet method, the Bayes wavelet denoising method is used to remove the noise, while the spatial variability characteristics of the signal are preserved. Finally, the wavelet energy spectrum is adopted to obtain the duration and energy of the non-stationary vibration data. The time-frequency function curve is obtained to further analyse the physical behaviour of the vehicletrack system. A hammering experiment is conducted to show the importance of the results. This work facilitates a better understanding of the track vibration characteristics for monitoring the status of the track.

show abstract

Structural damage identification of plates based on modal data using 2D discrete wavelet transform

Cited by 30 publications

References 21 publications

Comparisons of wavelets and contourlets for vibration-based damage identification in the plate structures

Comparisons of wavelets and contourlets for vibration-based damage identification in the plate structures

Signal processing based damage detection of concrete bridge piers subjected to consequent excitations

Vibration analysis for slab track at different train speeds using Bayes wavelet denoising

Contact Info

Product

Resources

About