Dynamic characteristics of rotating cantilever plates with active constrained layer damping treatments

In this paper, the dynamic characteristics and vibration control of a rotating cantilever plate with fully covered active constrained layer damping (ACLD) treatments are investigated. The cantilever plate is rotating at different constant angular velocities about its normal to the horizontal plane. The model is based on the Kirchhoff classical laminated theory. The second kind of Lagrange formulation in conjunction with the finite element method (FEM) is developed to derive the governing equations of motion. Then the effects of different rotating angular velocities on modal characteristics of regular, passive constrained layer damping (PCLD) and ACLD treated-plate systems are investigated. In particular, frequency loci veering and crossing phenomena are exhibited and discussed in this work. Furthermore, the numerical simulation results of transient responses of regular, piezo-treated, PCLD and ACLD treated non-rotating and rotating plates in time domain are presented, respectively. Comparison of the performance of piezo, PCLD and ACLD treatments clearly demonstrate the merits of using ACLD as an effective means for suppressing the vibration of rotating cantilever plates. The results of this work are useful for system identification and vibration suppression of rotating flexible structures.