**Journal of Theoretical**

and Applied Mechanics

and Applied Mechanics

**0**, 0, pp. , Warsaw 0

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

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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