Characteristic of Axisymmetric Free Vibration of Viscoelastic Sandwich Circular Plate

Axisymmetric free vibration characteristics of viscoelastic sandwich circular plate was presented.Based on the basic assumption of elastic thin circular plate and Kelvin-Viogt constitutive equation,the vibration control equation of the viscoelastic circular plate was established.Eigen equations of free vibration were obtained by using Galerkin truncation method.The influence of core ratio on natural frequency and loss factor was discussed using numerical method.The results showed that the natural frequency increases at first,then decreases with the increase of core ratio.The loss factor always increases with the increase of core ratio.