On The Stability of Spinning Composite Cylindrical Shells Partially Filled With Liquid

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Permoon, Mohammad Reza | 2010

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 40597 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Haddadpour, Hassan; Dehghani Firoozabadi, Rohollah
Abstract:
In the present project an analytical model is proposed for the instability of spinning composite cylindrical shells partially filled with fluid. For this purpose, using the linearized Navier-Stokes equation for the incompressible flow, a 2-D model is developed for fluid motion at each section of the cylinder. The resultant pressure exerted on the cylinder wall as the result of the fluid motion, are calculated in terms of elastic displacements of the cylinder. Applying the Hamilton principle, the governing equations of motion of the cylinder are derived and then combined with the equations describing the fluid pressure to obtain the coupled-field equations of the structural-fluid motion. Using the obtained model, the stability boundaries of the cylinder are determined. The effect of material viscoelasticity and structural damping on the stability boundaries of the cylinder is investigated. Furthermore some test cases are used to study the effect of the important parameters on the critical spinning speed of the problem. For a number of examples the results of the stability analysis are presented and some conclusions are outlined.
Keywords:
Fluid-Structure Interaction ; Shells ; Instability ; Spinning Frequency ; Cylinder Partially Filled with Liquid

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