Wavelet transforms (WTs) have gained popularity due to their ability to identify singularities by decomposing mode shapes of structures. In VBDD, the support condition of a
structure influences structural responses and modal properties. In fact, the 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 are carried out. The estimated appropriate distance is 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 have
been introduced by releasing bolts at 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 was necessary for accurate damage detection, and both, CWT and DWT could provide reliable outputs. However,
the first- and fourth-level detail coefficients of DWT failed 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 increased as the
scale decreased.
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