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|Title:||Studying the Impact of Localized Defects Associated with Angular-Contact Ball Bearings on the Vibration Characteristics of High-Speed Rigid Rotor Spindle System||Authors:||Mohammad Khalifa Al-Mutairi||Supervisor:||Dr. Mohammed Alfares||Keywords:||Localized||Issue Date:||2018||Publisher:||Kuwait university - college of graduate studies||Abstract:||In this thesis, a high-speed dynamic model of ball bearings, with localized surface defects, is proposed theoretically to investigate the impact of the ball bearing defects on a grinding machine's spindle dynamics and on its vibration behavior. A theoretical model with five degrees of freedom, which represents the spindle-bearing system, was developed. Then, the analytical model was used to simulate and predict the effects of the localized bearing defects on both races. The impact of the localized defects on the vibration of the grinding machine’s spindle was studied especially at the edge of the grinding wheel. Time and frequency domains were used to present the results of the defect-free bearings and the localized defects (i.e., dent and bump) on the raceways. The vibration frequencies, due to the localized defects, were mainly comprised of the outer race ball passage frequency (BPFO) and its harmonics for the outer race defect, and the inner race ball passage frequency (BPFI) and its harmonics plus BPFI±s and 2BPFI±s for the inner race defect. The effects of varying bearing preload force, contact angle, defect size, and defect location on the proposed model were investigated. Further, multi defects and defect type were applied to the model, and their effect were considered. Furthermore, the shaft speed (ω_s) variation effect was analyzed in this thesis. The simulation results were compared with the results of the prior studies for validation.||URI:||http://hdl.handle.net/123456789/733|
|Appears in Programs:||0630 Mechanical Engineering|
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