Sound radiation from finite ring-stiffened cylindrical shells coated with viscoelastic layer

Sound radiation from finite ring-stiffened cylindrical shell coated with viscolelastic layed are discussed.Theviscoelastic layer motion is described by means of Navier equations.Numerical results are given that exhibit the influenceof viscoelastic layer on the vibroacoustic behavior of the shell.From the viewpoint of noise-reducing,some viscoelasticlayer's parameters are taken into account:Young modulus,the Possion ratio,the density and the structural loss factor.