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Vibration of Circular Plate with Multiple Eccentric Circular Perforations by the Rayleigh Ritz Method Essay Preview: Vibration of Circular Plate with Multiple Eccentric Circular Perforations by the Rayleigh Ritz Method Report this essay Abstract The free vibration of a circular plate with multiple perforations is analyzed by using the Rayleigh Ritz Method. Admissible functions are.