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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
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