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Balancing of a Flexible Rotor During Operation

Kamari, Morteza | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50389 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Mohammad Navazi, Hossein
  7. Abstract:
  8. In this project, a system designed for balancing a flexible rotor, without any need for shutting down the rotor. Then, functionality of this system, studied with experimental assessments. The method used in this plan, is classified into active online balancing methods of rotors which can change the mass distribution of the rotor, to improve the balancing condition, during operation. In order to reach this goal, a balancer plane is designed that by angular displacement of two nonconcentric masses, each driven with an electrical actuator, sets a desired unbalancy vector. Then, a rotor designed, which after mounting balancer plane, could be classified into the flexible rotors according to ISO11342, also, requirement of stopping for balancing, is eliminated. With installing an acceleration transducer beside the bearing and using 4-run balancing method, a primary balance is performed and therefore, the rotor is ready for testing the balancer plane. Due to operating speed of the rotor that is near to first flexible critical speed, one balancing plane is selected in the middle of the shaft and balancer plane is located in this position. Final results of running the rotor and testing the balancer plane, shows that vibration amplitude of the rotor is significantly reduced after performing 4-run method, without shutting down the rotor. In the next step after proving functionality of the balancer plane, a new balancing method is preferred that specially is for rotors having the ability to actively balance themselves. This method, is based on the continuous variation of the position of the trial mass and is simplifier and quicker than 4-run balancing method. Tests showed that after balancing the rotor using this procedure, the vibration amplitude of the rotor is reduced to one-eighth of its first run
  9. Keywords:
  10. Balance ; Rotors ; Flexible Rotor ; Online Balancing ; Active Balancing ; Four-Run Method ; Trial Mass

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