Skidding behavior of cylindrical roller bearings under time-variable load conditions

摘要

Highlights?A nonlinear dynamic model is proposed to predict the skidding behavior.?Various effects are considered for roller bearings under time-variable load.?Local skidding for each roller could still be found and vary periodically.?Time-variable load lead to the frequency of time-varying slipping velocity change.?The results are useful for design and monitoring of rotating machinery.Graphical abstractDisplay OmittedAbstractConsidering the radial clearance, roller crown profile and discontinuous contact between the roller and cage, a nonlinear dynamic model for skidding behavior of the cylindrical roller bearing is established based upon the Hertz contact theory and elastohydrodynamic lubrication. Through comparisons with both reference and experimental results, the proposed model is verified. Various load conditions are considered for their effects on single roller’s skidding behavior. It is shown that local skids exist and periodically vary with the roller revolution, especially for the roller entering and leaving the load region. Increasing the values of radial load, bending moment or amplitude of time-variable load all reduces the maximum roller slipping velocity, which means that the roller skids are attenuated. After considering the time-variable radial load, the frequency of time-varying slipping velocity is not the orbital speed but the combination of the inner race frequency and orbital speed.]]>