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Dynamic Behavior and Stability Analysis of Rotor-Seal System

Azarakhsh, Pooria | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52818 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Mohammmad Navazi, Hossein
  7. Abstract:
  8. The present research aims to achieve two main objectives in the Rotordynamic. The first one is, study and calculate the linear dynamic coefficients of a tapered gas seal, and the second one is, analysis the dynamic behavior and stability of the Timoshenko rotor supported with tapered gas seal. Classical Reynolds equation is used to calculate the dynamic coefficients of tapered gas seal. At first, using the perturbation method, the perturbed equations for gas film thickness and pressure are obtained. The finite difference method (FDM) is utilized to transfer the obtained PDEs to the algebraic system of equations. The algebraic system of equations then solved, and the zeroth and first-order pressure distribution are obtained. The dynamic coefficients are calculated. The dynamic coefficients are used as rotational springs and damper at both ends of the multi-stepped rotating shafts. The Timoshenko beam theory (TBT) is used to modeling the dynamic equations of the rotor. Complex eigenvalues of the rotor-seal system are obtained, as well as, stability analysis is performed. Also, the frequency response diagram shows that the amplification factor in the rotor-seal system is less than the simply supported boundary coditions
  9. Keywords:
  10. Reynolds Equation ; Galerkin Method ; Frequency Response ; Timoshenko Rotor ; Rotor Stability ; Tapered Gas Seal ; Rotor Dynamics

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