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Simulation of Vortex Induced Vibration and Limit Cycle Oscillation on Flexible tall towers and Suspended Cables

Imaninejad, Ehsan | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42603 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Department
  6. Advisor(s): Dehghani Firoozabadi, Rouhollah
  7. Abstract:
  8. Vibration of flexible slender structures under vortex induced vibrations is one of the important subjects in the different fields of engineering such as overhead electricity transmission cables, columns, tall towers and suspended bridges. During passes of flow around bluff bodies, in the certain range of velocity, the Von Karman vortices sheds unsynchronized from two sides of bluff bodies. When structure frequency closed to the vortex shedding frequency, resonant vibrations happen and one can observe vibrations with limited amplitude. Simulations of these phenomenons are so complicated and time consuming prosess, but there is an engineering method for simulating this phenomenon. The aim of this project is to present and develop an engineering method for simulation of this phenomenon (which is famed as lock-in) for suspended cables and tall towers. For this propose, Tamura engineering aerodynamic model with second order nonlinear equations for structure’s vibration is used. Then, with explanation of flow forces according to structure’s displacements, interaction of structures and flow’s equations are obtained. The governing equations are solved with modal method, then instability domain and limited amplitude vibrations are analyzed
  9. Keywords:
  10. Nonlinear Vibration ; Locking ; Shedding Vortex ; Non-Aerodynamic Section

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