الفهرس 
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Abstract
The present thesis is intended to establish a new methodology to predict the actual fatigue life of rolling element bearings. Experimental modal analysis is conducted on the bearings
to determine the vibration modal parameters. Fatigue life theory of rolling element bearings is used to correlate the fatigue life with both the dynamic applied load and the dynamic load rating. In this thesis, statistical analysis has been conducted to correlate the modal parameters to dynamic load ratings. The relationship between the vibration modal parameters and the dynamic applied load is finally verified. An experimental modal analysis test setup is especially built up to test the modal parameters of the bearings. The statistical analysis is conducted using XLST AT software, Microsoft® Excel add-in. Iris found that the vibration modal parameters (natural frequency, damping ratio and value of Frequency Response Function at resonance) can represent the dynamic load rating of each individual bearing. Although bearings with the same manufacturing code have the same dynamic load rating and the same calculated life according to Lundberg-Palmgren theory, they showed significant differences in their vibration modal parameters. Hence, the
importance of dynamic test for each bearing. A rigid equation of bearing absolute life is established as a function of the vibration modal parameters and the operating conditions. The developed methodology can be used as a unique bearing acceptance test since it could be used to select the bearing with the longest predicted life from a batch of shipped
bearings.