“…78 Besides analytical approaches, a great number of numerical 79 simulation methods [7 -10] have been employed to study the 80 Lamb wave propagation. Willberg et al [10] 81 state-of-the-art numerical simulation methods used in guided 82 wave-based SHM. These approaches include finite element 83 analysis [11][12][13][14][15][16][17][18][19][20][21][22][23][24], finite difference equations [25][26][27], finite 84 strip element [28,29], boundary element method [30,31], 85 semi-analytical finite element analysis [32][33][34][35][36][37][38][39][40], global matrix 86 methods [41], spectral element approaches [42][43][44][45][46][47][48], mass-spring 87 lattice models [49,50], the local interaction simulation approach 88 (LISA) …”