“…Currently, research has mainly focused on three aspects: the region segmentation, the equivalent substitution, and the separation of cutouts and plate domains. Then, to examine the vibration characteristics of the rectangular plate with cutouts, semi-analytical methods generally used are the Rayleigh-Ritz methods (RRM) [2,13,14], the multi-term extended Kantorovich method (MEKM) [15], the extension of Hencky bar-net method [16], Chebyshev-Lagrangian method [17], the Green function method [18], the superposition method, the assumed mode method [19,20], the improved Fourier series method [21,22], the Dynamic Stiffness Method (DSM) [23], and the Spectro-Geometric Method (SGM) [24].…”