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Self Alignment Rolling Bearing Lifetime Prognosis with Damage Mechanics Method

Mirzaei Rafsanjani, Hesam | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39008 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Behzad, Mehdi; Mehdigholi, Hamid
  7. Abstract:
  8. The ability to predict the remaining life of bearings is one of main aspects for improvement of reliability of bearings. However, techniques to predict the lifetime of a bearing under the practical operating conditions have not been well developed. In this thesis, prognostic model for bearing systems based on vibration response analysis is considered as a single-degree-of-freedom vibratory system. As the bearing system is considered as a single-degree-of-freedom vibratory system, its acceleration amplitude at the natural frequency can be related to the system stiffness. Moreover, the relationship between failure lifetime, running time and stiffness variation can be established from the damage mechanics. The damage mechanic equation can be written in linear and nonlinear approaches. Combining the above two, the natural frequency and the acceleration amplitude of a bearing system can be related to its running time and failure lifetime. Thus, the failure lifetime of a bearing system can be predicted on-line based on vibration measurement Experiments have been performed to compare the accuracy of linear and nonlinear equations and validate the proposed model. In this thesis, primary tests have been performed to comparison of linear and nonlinear equations and find the nonlinear equation is better than linear equation. Finally, two tests were done to validate the results of the project and illustrated that the nonlinear approach can be used to predict the remaining life of bearing
  9. Keywords:
  10. Remaining Useful Life ; Vibration ; Fracture Mechanics ; Rolling Bearing

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