Effect of Preload on the Vibrations of EHL Angular Contact Ball Bearings: Theoretical and Experimental Results

The vibrations of a shaft in rotary mechanical systems supported by angular contact ball bearings are investigated theoretically and experimentally for various preloads this paper. In the theoretical part study, dynamic bearing model is presented, rigid EHL has been modelled as 5 DoF. Non-linear equations motion solved numerically Runge–Kutta method. second an experimental setup that enables performing different operating cases designed to validate results. Theoretical data compared both time frequency domains results compared. It observed from studies preload significant effect on vibration behaviour. Results show increase reduces amplitude variable compliance frequencies bearing, natural system shifted higher value, using signal processing with envelope spectrum gives better spectral analysis; small deviations occur between due modulation noise machine elements such gear, motor, misalignment, waviness, etc. Therefore, presented can be used reasonable accuracy examine shaft-bearing system.