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Vibration and Stability of a Pipe Conveying Flow and Application in Firefighting UAVs

Vesaghati Javan, Mohsen | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52580 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Dehghani Firouzabadi, Rohollah
  7. Abstract:
  8. In this project, vibration and stability condition of a pipe conveying flow has been studied for use in firefighting plane. The Plane is a multi-rotor that carries the pipe to a certain height and it does the washing work there, bassed on the fluid flow from the nozzle embedded in the end of the pipe. Due to the flexibility of the pipe in this application, structure modeling is based on cable without bending stiffness. The Galerkin method is used to solve equations by considering the assumed mode shape for structure. At first, by analyzing free vibrations, different boundary conditions were considered for the pipe and the natural frequencies and natural shape modes were extracted in different states. Then, by adding the effects of internal fluid flow, the stability of the fluid carrier structure was investigated. The effects of plane elevation change and displacement of cable end, on the natural frequencies of the structure as well as the velocity and frequency of instability are discussed. Also, the time response of the system in several cases including velocities of internal flow lower and higher than the critical velocity, by using the Runge-Kutta 4th-order numerical solution. Finally, the equations of movement of the plane in coupled to the pipe conveying flow is extracted and simulated in the Simulink software and with using a number of simple controllers, controllability and stability of the plane is discussed
  9. Keywords:
  10. Vibration ; Stability ; Galerkin Method ; Plane Control ; Pipe Conveying Flow ; Time Responce

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