M. Ghayour, A. Sedaghat, M. Mohammadi, Wave Propagation Approach to Fluid Filled Submerged Visco-Elastic Finite Cylindrical Shells, JAST, Vol 8, No. 1, 2011, pp. 1-11.

Wave Propagation Approach to Fluid Filled Submerged Visco Elastic Finite Cylindrical Shells

M. Ghayour A. Sedaghat M. Mohammadi

Abstract

Multi layer orthotropic nite cylindrical shells with a viscoelastic core in

contact with uids are gaining increasing importance in engineering Vibra

tional control of these structures is essential at higher modes In this study

an extended version of the wave propagation approach using rst order shear

deformation theory of shell motion is employed to examine the free vibration

of damped nite cylindrical shells in vacuum or in contact with interior or

exterior dense acoustic media For this purpose a one layered viscoelastic

nite cylindrical shell and a three layered orthotropic nite cylindrical shell

with a viscoelastic core layer were used Complex natural frequencies have been

extracted and the eects of uid coupling on real and imaginary parts of natural

frequencies have been examined The results reveal that the uid reduces the

imaginary part as much as the real part of the damped natural frequency but

that the proportion of the imaginary to the real part loss factor remains rather

unchanged Another aspect of the study involves the investigation of the eect of

shell parameter m when the circumferential mode number n increases on both

entities of damped natural frequencies It is found that by increasing n the real

part of the natural frequency follows a u shape trend however the imaginary

part reduces and levels o for higher circumferential numbers The loss factors

remain almost constant for these higher modes The results of the current

approach are nally compared with ABAQUS solutions showing superiority of

current approach

Journal Papers

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Winter

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2011

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