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Crack Detection in a Rotor using Traditional Mode Shape Based Modal Analysis Methods and Experimental Evaluation

Ashtiani, Mohammad Reza | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48716 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Mohammad Navazi, Hossein
  7. Abstract:
  8. Fatigue crack growth can have harmful effects on the reliability rotary machine. While an early warning to crack, can be used to extend the life of these expensive machines and increase reliability.Structural Vibration Condition Monitoring as a primary fault detection method, achieved to a lot amazing result and for this reason studies vibration behavior of cracked rotational shaft is a big issue for engineers of dynamic machine.In this research, first check the fault detection methods based on structural vibration condition monitoring, mode shape methods were extracted. Then by modeling rotational shaft in computer and creation of crack on it, fault detection quality of these methods have been tested. Finally, by making experimental rotor model and cut out rotor in real dimensions, operation efficiency of these methods have been tested.The results indicated that most fault detection techniques based on modal mode shape have acceptable efficiency in stasis state. As well as some of them are acceptable in rotational state. Finally, it can be concluded that Mode Shape Curvature Square (MSCS) method is the best and most reliable method of fault detection based on mode shape. Although Mode Shape Slope (MSS) method and Mode Shape Curvature (MSC) method had fault detection capabilities in stasis state but they don’t have fault detection capabilities in rotational state
  9. Keywords:
  10. Vibration ; Modal Analysis ; Fault Detection ; Cracked Rotor ; Mode Shapes ; Structural Vibration

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