Axisymmetric vibration and damping analysis of rotating annular plates with constrained damping layer treatments

The axisymmetric vibration and damping of rotating annular plates with constrained damping layer treatments are analyzed in the present paper. The discrete layer annular finite element method is employed to derive the equations of motion for the rotating composite plate where the geometry stiffness matrix induced by rotation is evaluated from solutions of static problems. The viscoelastic material in the central layer is assumed to be incompressible, and the extensional and shear moduli are described by complex quantities. Complex-eigenvalued problems are then solved, and the frequencies and modal loss factors of the composite plate are extracted. The effects of stiffness and thickness of the viscoelastic and constraining layers on the natural frequencies and modal loss factors of rotating composite plates are presented. Also, the composite plates with various boundary conditions and partial treatments are discussed.