The vibration response simulated by the dynamic model of a bearing with spall failure mainly depends on the energy change of the rolling element as it passes through the defective area.In order to establish a dynamic model based on the energy fluctuation of the rolling body when it passes through the defective area

the motion track of the rolling body peeling fault at different slopes was deduced according to the geometric relation.Based on the Hertz contact theory and the law of conservation of energy

the corresponding time-varying energy formula was constructed.The dynamic model was introduced for simulation

and the relation between the energy change and the vibration response of the rolling body when it passed was quantified.The simula⁃tion and experimental results are in good agreement

which proves the relation between the vibration response of the bearing with spall failure and the energy fluctuation of the rolling element.The established dynamic model can effectively predict the vibration signal of the bearing with spall failure.