A variable kinematic Ritz formulation for vibration study of quadrilateral plates with arbitrary thickness

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Natural frequencies of sandwich plates with FGM core via variable-kinematic 2-D Ritz models (2013, methodology): “The work can be considered as an extension of the variable-kinematic Ritz method presented in [31,32], which were limited to isotropic and laminated composite plates, respectively.”
Accurate free vibration analysis of thermo-mechanically pre/post-buckled anisotropic multilayered plates based on a refined hierarchical trigonometric Ritz formulation (2013, result): “Note that a similar behavior was found in a previous variable-kinematics Ritz formulation employed for quadrilateral isotropic plates [58].”
A Numerical Investigation on the Natural Frequencies of FGM Sandwich Shells with Variable Thickness by the Local Generalized Differential Quadrature Method (2017, methodology): “On the other hand, a variable kinematic Ritz approach was employed by Dozio and Carrera [78] to evaluate the vibrational behavior of quadrilateral plates with arbitrary thickness.”
On the application of the Ritz method to free vibration and buckling analysis of highly anisotropic plates (2018, methodology): “Within the CUF framework, different sets of boundary conditions were considered by the authors, using polynomial functions [35], Chebyshev [36,37] and Legendre polynomials [38,39].”