Dynamic Analysis Model of Spherical Roller Bearings with Defects

摘要

Rolling element bearings are essential components of rotating machinery. The sphericalroller bearing (SRB) is one variant seeing increasing use, because it is self-aligning andcan support high loads. It is becoming increasingly important to understand how the SRBresponds dynamically under a variety of conditions. This doctoral dissertation introducesa computationally efficient, three-degree-of-freedom, SRB model that was developed topredict the transient dynamic behaviors of a rotor-SRB system. In the model, bearingforces and deflections were calculated as a function of contact deformation and bearinggeometry parameters according to nonlinear Hertzian contact theory. The results revealhow some of the more important parameters; such as diametral clearance, the numberof rollers, and osculation number; influence ultimate bearing performance. Distributeddefects, such as the waviness of the inner and outer ring, and localized defects, suchas inner and outer ring defects, are taken into consideration in the proposed model.Simulation results were verified with results obtained by applying the formula for thespherical roller bearing radial deflection and the commercial bearing analysis software.Following model verification, a numerical simulation was carried out successfully for afull rotor-bearing system to demonstrate the application of this newly developed SRBmodel in a typical real world analysis. Accuracy of the model was verified by comparingmeasured to predicted behaviors for equivalent systems.