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ARTICLE
Experimental damage assessment of support condition for plate structures using wavelet transform
1
Construction Research Centre, Universiti Teknologi Malaysia, Johor, Malaysia
2
School of Civil Engineering, Universiti Teknologi Malaysia, Johor, Malaysia
3
Institute of Noise and Vibration, Universiti Teknologi Malaysia, Kuala Lumpur, Malaysia
4
Forensic Engineering Center, Universiti Teknologi Malaysia, Johor, Malaysia
Submission date: 2017-07-05
Acceptance date: 2019-02-03
Publication date: 2019-04-15
Journal of Theoretical and Applied Mechanics 2019;57(2):501-518
KEYWORDS
ABSTRACT
Wavelet transforms (WTs) have gained popularity due to their ability to identify singu-
larities by decomposing mode shapes of structures. In VBDD, the support condition of a
structure influences structural responses and modal properties. In fact, the structural re-
sponses 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 di-
stance 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 accu-
rate 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 ca-
ses. 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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