Journal of Theoretical
and Applied Mechanics

0, 0, pp. , Warsaw 0

Experimental damage assessment of support condition for plate structures using wavelet transform

Muyideen Abdulkareem, N. Bakhary, M. Vafaei, N. Md Noor, R. Abd Samat
Wavelet transforms (WTs) have gained popularity among researchers as tools for
identifying damage in structures using vibration-based damage detection (VBDD) techniques, owing
to their ability to identify singularities by decomposing mode shapes structural responses of the
structure. In VBDD, the support condition of a structure influences the structural responses and modal
properties. In fact, structural responses and modal properties are a lot more sensitive to changing
boundary conditions than to crack and fatigue damage, resulting in inaccurate damage detection
results. Therefore, in this study, sensitivity tests to estimate a suitable distance range which allows
damage detection by imposing single support damage were carried out. The estimated appropriate
distance was then applied to detect damage at multiple supports. This involved the applicability of
response acceleration of plate structures to support assessment by applying continuous wavelet
transform (CWT) and discrete wavelet transform (DWT). The damage cases were introduced by
releasing bolts at the specified fixed supports of the plate to simulate the damage. The response
accelerations of the rectangular plate at points close to the supports were measured and decomposed
using CWT and DWT to assess the structural integrity of each support. The results showed that an
appropriate distance range is necessary for accurate damage detection, and both, CWT and DWT can
provide reliable outputs. However, the first- and fourth-level detail coefficients of DWT fail to
indicate damage in some cases. A more detailed investigation of the effect of different wavelet scale
ranges on damage detection using CWT demonstrated that the accuracy of damage detection increases
as the scale decreases.
Keywords: Support; Damage; Plate; Continuous wavelet transform; Discrete wavelet transform


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