The dimensionless parameter Gs ¼ rg0, called theGabor shaping factor, was introduced to find an optimal form of w(t) in Eq. (41). The Gabor wavelet withGs¼ 5:0 is known as the (complex) Morlet wavelet.However, in this study Gs ¼ 3:5 was proposed since itresulted into smaller interference between the incidentand reflected waves. For damage extent estimation, thewave reflection and transmission are depicted in thebeam model shown in Fig. 9. The vertical displacementof the beam before and after the cut are denoted by v1and v2, respectively, which can be written as [46]