Modelling deep groove ball bearing localized defects inducing instantaneous angular speed variations

Abstract Instantaneous angular speed (IAS) analysis has been presented as an advantageous tool for non-stationary machinery surveillance. The physical analysis indicates that the instantaneous rotating speed variations are caused by torque perturbations. In a previous work, a method for introducing angular periodic disturbances in rotating systems dynamic models was presented. This analysis was based on the introduction of a parametric perturbation applied to the system as an external torque. The current work introduces an original formulation to induce tangential forces to the shaft due to the bearing components dynamics by means of a Hertzian contact roller bearing model. The methodology takes into account rotational bearing races and rolling elements degrees of freedom, making the model suitable for non-stationary conditions.