In this paper a method for crack identification in beam structures by analyzing the fundamental mode of cracked cantilever beam using continuous wavelet transform is presented. The crack in the beam is modeled as combination of spiral and linear springs and the coupling of bending and longitudinal vibration of cracked cantilever beam is considered. The elements of stiffness matrix are determined from the available expressions for stress intensity factor and strain energy release rates. Considering the beam as continuous to the left and right of the crack and applying boundary conditions the characteristic equation in turn natural frequencies and mode shapes are determined for free transverse vibrations. By analyzing all these results the crack location can be determined. The viability of the method is investigated both analytically and experimentally in case of a cantilever beam containing a transverse surface crack .In the light of results obtained, the advantages and limitations of the work are presented and discussed. The applicability of this method for fault diagnosis is discussed.
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