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Dynamic Analysis of Rotating Stiffened Cylindrical Shell Using Improved Finite Element Method

Jamshidi Afarani, Saeed | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52835 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Kouchakzadeh, Mohammad Ali
  7. Abstract:
  8. In this research, the dynamic behavior of a rotating stiffened cylindrical shell has been investigated using the refined finite element method. Refined FEM means decreasing degrees of freedom based on decoupling the structure to longitudinal and layerwise directions. The refined FEM has been used to solve the 3D rotor dynamics equations. The natural frequencies and the corresponding modes have been calculated and verified for some existed data and problems. In addition, the effects of the shell geometry dimensions on the natural frequencies and mode shapes have been studied. Also, the relationship between the length to radius ratio, radius to thickness ratio, rotational speed, Aspect ratio and number of stiffeners and the natural frequency have been studied. Finally, the dynamic behavior of the rotating stiffened cylindrical shell is improved and the campbell diagram is presented.In the parametric study section, it is shown that the shell dimensions have a significant effect on the natural frequencies of the shell, such that by decreasing 4 times the thickness of the shell, some frequencies are reduced by 70% and increasing 4 times the length of some shells, some frequencies increases up to 90%. Increasing the stiffeners area and rotational speed will always increase the natural frequencies of the shell. By improving the shell's dynamic behavior, some natural frequencies can be increased by up to 23%
  9. Keywords:
  10. Dynamic Behavior ; Rotating Cylindrical Shell ; Refined Finite Element Method ; Stiffened Cylindrical Shell ; Modal Analysis

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