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Control of Cable Vibration under Rain-wind Induced Vibration with Magneto-rheologycal Jacketing

Turkesh, Purya | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51017 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Haddadpour, Hassan
  7. Abstract:
  8. The present thesis follows two aims in the phenomenon of vibration and control of cable of cable-stayed bridge under rain-wind induced vibration (RWIV). The first one is to study the response of the cable and consequently the second one aims to control these vibrations that occurred in the cable. The assumed continuous cable has lateral, in plane bending (IP), out of plane bending (OOP) and torsion mode. The effect of rainfall on the cable has been modeled with mobile upper rivulet on the cable surface and the effect and shape of lower rivulet have been neglected. RWIV is not vortex-induced vibration (VIV), nor wake galloping, because the dominant frequency of RWIV is lower than VIV and amplitudes (peak to peak) are bigger than its. In this thesis a cable has been modeled linear and non-linear under quasi-aerodynamic and upper rivulet motion. After finding wind speed rang that RWIV occurred, then, parametric study was examined and we realized the elasto-geometry parameter of cable has a great roll on IP and OOP amplitudes. After that semi-active damper for control of vibration was used. For semi-active damper, Magneto-rheological fluid is used with modified Dahl model and for the control logic, Modulated homogeneous friction algorithm is used. Results show that the use of MR damper has significantly more effect than viscous damper
  9. Keywords:
  10. Magnetorheological Damper ; Quasi Steady Aerodynamics ; Cables ; Semiactive Damper ; Rain-Wind Indued Vibration ; Upper Rivulet

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