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Vibration Analysis of Spur and Helical Geared-rotor System under Residual Shaft Bow Effect

Hojaji Najafabadi, Davood | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54117 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Haddadpour, Hassan
  7. Abstract:
  8. The purpose of this study is to establish a lateral-torsional-axial dynamic model for spur and helical geared rotor systems subject to shaft bow manufacturing error. Timoshinko shaft element, elastic bearings and rigid disks used to simulate different element in the model. Tooth contacts is modeled with linear spring and damper along the pressure line.Results show that the vibration pattern of the unbalanced load and shaft bow effect is different. These obtained patterns might help with the fault diagnostics of rotating machinery. The vibration will be lowest if the unbalanced load and the shaft bow amplitude locates out of phase. The previous researches show that different pattern of the shaft bow might occur in the manufacturing process. In this work different shaft bows assumed, and their different vibration pattern obtained. For example, 2nd order shaft bows stimulate the backward conical modes and odd-order shaft bows activate the cylinderical forward modes.In the previous works, the tooth contacts modeled with a stiffness along the pressure line. In this study, the tooth contact model includes torsional stiffness as well. This torsional stiffness assumed for modeling non-uniform pressure distribution due to angular misalignment. The results show that in systems with soft bearings this torsional stiffness has a great influence on the critical speed of coupled modes. But in the system with hard bearings the effect of this stiffness is negligible
  9. Keywords:
  10. Dynamic Analysis ; Finite Element Analysis ; Power Transmission System ; Spur Gear ; Critical Velocity ; Helical Geared-Rotor

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