WAVE PROPAGATION APPROACH TO FLUID FILLED SUBMERGED VISCO-ELASTIC FINITE CYLINDRICAL SHELLS

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GHAYOUR N.; SEDAGHAT A.; MOHAMMADI M.

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Journal: Journal of Aerospace Science and Technology Year:2011 | Volume:8 | Issue:1 Page(s): 57-67

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Title

WAVE PROPAGATION APPROACH TO FLUID FILLED SUBMERGED VISCO-ELASTIC FINITE CYLINDRICAL SHELLS

Author(s)

GHAYOUR N. | SEDAGHAT A. | MOHAMMADI M. | Issue Writer Certificate

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Abstract

Multi-layer orthotropic finite cylindrical shells with a viscoelastic core in contact with fluids 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 first-order shear deformation theory of shell motion is employed to examine the free vibration of damped finite cylindrical shells in vacuum or in contact with interior or exterior dense acoustic media. For this purpose, a one-layered viscoelastic finite cylindrical shell and a three-layered orthotropic finite cylindrical shell with a viscoelastic core layer were used. Complex natural frequencies were extracted and the effects of fluid coupling on the real and imaginary parts of natural frequencies were examined. The results reveal that the fluid 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 effect 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 finally compared with ABAQUS solutions showing superiority of the current approach.

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APA: Copy

GHAYOUR, N., SEDAGHAT, A., & MOHAMMADI, M.. (2011). WAVE PROPAGATION APPROACH TO FLUID FILLED SUBMERGED VISCO-ELASTIC FINITE CYLINDRICAL SHELLS. JOURNAL OF AEROSPACE SCIENCE AND TECHNOLOGY (JAST), 8(1), 57-67. SID. https://sid.ir/paper/291003/en

Vancouver: Copy

GHAYOUR N., SEDAGHAT A., MOHAMMADI M.. WAVE PROPAGATION APPROACH TO FLUID FILLED SUBMERGED VISCO-ELASTIC FINITE CYLINDRICAL SHELLS. JOURNAL OF AEROSPACE SCIENCE AND TECHNOLOGY (JAST)[Internet]. 2011;8(1):57-67. Available from: https://sid.ir/paper/291003/en

IEEE: Copy

N. GHAYOUR, A. SEDAGHAT, and M. MOHAMMADI, “WAVE PROPAGATION APPROACH TO FLUID FILLED SUBMERGED VISCO-ELASTIC FINITE CYLINDRICAL SHELLS,” JOURNAL OF AEROSPACE SCIENCE AND TECHNOLOGY (JAST), vol. 8, no. 1, pp. 57–67, 2011, [Online]. Available: https://sid.ir/paper/291003/en

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