Free vibration of circular cylindrical shell with constrained layer damping

Free vibration characteristics of circular cylindrical shell with passive constrained layer damping(PCLD) are presented.Wave propagation approach rather than finite element method,transfer matrix method,and Rayleigh-Ritz method is used to solve the problem of vibration of PCLD circular cylindrical shell under a simply supported boundary condition at two ends.The governing equations of motion for the orthotropic cylindrical shell with PCLD are derived on the base of Sanders’ thin shell theory.Numerical results show that the present method is more effective in comparison with other methods.The effects of the thickness of viscoelastic core and constrained layer,the elastic modulus ratio of orthotropic constrained layer,the complex shear modulus of viscoelastic core on frequency parameter,and the loss factor are discussed.