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Torsional Vibration Online Monitoring Design and Manufacturing

Samavatian, Mohammad | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47205 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Behzad, Mahdi
  7. Abstract:
  8. All rotating machines (such as internal combustion engines, reciprocating compressors, propulsion systems, etc.) experience torsional vibration during Start up, continuous working conditions and blackout. Torsional vibrationis due to pressure rhythms, engine dynamic torques, etc. All components of a rotating system must convey dynamic torque in addition to the static torque.Excessive Torsional vibrations cause wear and damage such as gears, gear teeth damage and failure to the main shaft.Online monitoring of torsional vibrations of the machine can be displayed machine condition at any moment and consider the risk in early diagnosis. Shaft torsional vibration monitoring can detect cracks in the early stages of the formation, monitoring blades and propeller attached to the shaft, impeller cavitation monitoring, monitoring of static and dynamic torque transfer from couplings. It can be an information systems to defects such as lack of combustion in the cylinder can causing excessive torsional vibration amplitude.The project aims to build an online monitoring system that monitor the static and dynamic torque on the shaft by shaft torsional vibration signal, at any time. Two general methods for monitoring vibration of torsional vibration is used-contact and non-contact. In this project by using contact method a torsional vibration signal can be transfer from rotor to stator by using fluid transformer measure torsional vibration of a two degrees of freedom system. A system with two degrees of freedom with torsional vibration transformer by a strain gauge to check the feasibility of the transfer signal from rotor to stator by fluidwas designed and manufactured.Finally, it was observed that in this method because of low noise and no need for a power supply mounted on the shaft and Insensitivity to lateral vibrations compared to other contact methods is more advantage
  9. Keywords:
  10. Rotors ; Strain Gages ; Online Monitoring ; Torsional Vibration ; Signal Transferring ; Ionic Fluid

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