Abstract
A finite element (FE) model of spindle system with defect bearings is proposed. The drawbar, shaft, housing and other beam structures are modelled as Timoshenko's beams, while the pulley, sleeve and other disk components are modelled as disk elements. All the components' models are integrated together to obtain the FE model of the spindle system. The FE model is verified by carrying out modal tests on a motorised high speed spindle and the frequency response functions are measured. Good agreements between the simulation and experiment show the accuracy of the FE model. A bearing model for raceway defects is presented by considering the geometric relation between ball and raceways. The bearing model is then integrated into the FE model of spindle. Vibration responses of spindle system with different kinds of defect bearings are simulated and their vibration characteristics are analysed and discussed in both time domain and frequency domain, which may provide useful proofs for condition monitoring and fault diagnosis of spindles.
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