Vibration control of a sandwich annular plate with an electrorheological fluid core layer

摘要

A free vibration analysis of an annular plate with an electrorheological ( ER) fluid core and a constraining layer is presented in this study. A discrete finite element method is used to investigate the vibrational characteristics of the sandwich annular plate. The extensional and shear moduli of the ER fluid layer are described by complex quantities. Complex eigenvalues are then found numerically, and from these, both frequencies and loss factors are extracted. When applying an electric field, the rheological properties of the ER fluid materials, such as viscosity, plasticity, and elasticity can be changed. When the electric field is applied to the sandwich structure, the damping of the system is more effective. The ER fluid core is found to have a significant effect on the vibrational behavior of the sandwich annular plate. The effects of ER layer thickness, constraining layer stiffness and thickness on natural frequencies and modal loss factors are also presented.