Abstract：The vibration modeling is a key link to explore the cognitive rules in fault diagnosis. In order to foresee the vibration characteristics accurately and efficiently, the transfer path and dynamic contact among joint interfaces are well studied. A novel methodology for dynamic modeling of 6DOF systems with bearing inner race-outer race- housing is presented based on the theories of Hertzian contact. The progressive processes of single and compound multi-defects are described by using practical kinematics of rolling bearings. The model provides the vibrations in time and frequency domains. Computed results from the model are validated with experimental results, which are generated using defective deep groove ball bearings. The complexities of vibration signal change with the emergence, and growth of faults. In this paper a new method of quantitatively describing the running condition of rolling bearings, based on nonlinear dynamics theory, is introduced. The Lempel-Ziv complexity measure is used to characterize the complexity of single and compound multi-defects signals. Results show that the complexity measure used as a quantitative criterion can effectively appraise the running condition of rolling bearings.
2013, Vol. 32 
