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Stability of Fractional Viscoelastic Pipes Conveying Fluid in the External Cross Flow

Shahali, Pooriya | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48975 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Hosseini Kordkhaili, Ali; Haddadpour, Hassan
  7. Abstract:
  8. In this thesis, the dynamic behavior of a pinned-pinned fractional viscoelastic pipe conveying fluid is examined in the external cross flow. The Galerkin method is employed to discretize the nonlinear coupled equations of motion for viscoelastic pipe conveying fluid in the external cross flow. Consequently, four modes of system are obtained. In addition, direct perturbation method of multiple scale is used to solve the governing nonlinear coupled equations of motion for the fractional viscoelastic pipe conveying pulsating fluid in the external cross flow. Moreover, time response diagrams are drawn in order to investigate under effects of the internal fluid velocity, external fluid reduced velocity, viscoelastic coefficient, fractional order and detuning parameter on the Peak amplitude of system. The results of the present study show that the peak amplitude of system increases and then decreases by enhancing external fluid reduced velocity. Furthermore, the peak amplitude of system decreases during lock in condition by increasing internal fluid velocity, viscoelastic coefficient and fractional order. Also, the vibration amplitude of system increases through enhancement of the amplitude of flow velocity fluctuation. Finally, the results of multiple scale method are validated by means of the Galerkin method
  9. Keywords:
  10. Fluid-Structure Interaction ; Cross Flow ; Multiple Scales Method (MMS) ; Locking ; External Cross Flow ; Fractional Viscoelastic Pipe

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