| Abstract | 第5-6页 |
| 1. Introduction | 第9-17页 |
| 1.1 Background and significance of research | 第9-10页 |
| 1.2 Research status | 第10-15页 |
| 1.3 Main work of the thesis | 第15-17页 |
| 2. Vibration mechanism of rolling bearing and common diagnostic methods | 第17-30页 |
| 2.1 Structure of rolling bearing | 第17-18页 |
| 2.2 Main forms of rolling bearing failure | 第18-20页 |
| 2.3 Rolling bearing fault detection method | 第20-25页 |
| 2.4 Vibration mechanism and fault frequency characteristic of rolling bearing | 第25-30页 |
| 2.4.1 Vibration mechanism of rolling bearing | 第25-26页 |
| 2.4.2 Natural frequency and characteristic frequency of rolling bearings | 第26-30页 |
| 3. Fractal characteristics of vibration signal of rolling bearing | 第30-34页 |
| 3.1 Introduction | 第30-31页 |
| 3.1.1 The definition and characteristics of fractal theory | 第30-31页 |
| 3.2 Fractal characteristics of vibration signal of dynamic bearing | 第31-33页 |
| 3.2.1 Fractal self similarity analysis of vibration signals of rolling bearings | 第31-32页 |
| 3.2.2 Scaling invariance of vibration signal of rolling bearing | 第32-33页 |
| 3.3 Chapter summary | 第33-34页 |
| 4. Mode decomposition theory | 第34-47页 |
| 4.1 Introduction | 第34-35页 |
| 4.2 Empirical Mode Decomposition | 第35-38页 |
| 4.3 Variational Mode Decomposition | 第38-42页 |
| 4.3.1 The bandwidth estimation method of IMF | 第39-40页 |
| 4.3.2 Multiplication operator alternate method | 第40-42页 |
| 4.4 TEO Demodulation | 第42-45页 |
| 4.4.1 The principle of TEO Demodulation | 第43页 |
| 4.4.2 Teager Energy Operator Demodulation | 第43-45页 |
| 4.5 Fault feature extraction of rolling bearing based on VMD and TEO | 第45-46页 |
| 4.6 Chapter summary | 第46-47页 |
| 5. Simulation analysis | 第47-55页 |
| 5.1 Introduction | 第47-48页 |
| 5.2 Simulation signal and decomposition result | 第48-49页 |
| 5.3 EMD for simulation signal | 第49-51页 |
| 5.3.1 Hilbert transformation for the results of EMD | 第49-50页 |
| 5.3.2 TEO Demodulation for EMD results | 第50-51页 |
| 5.4 VMD for simulation signal | 第51-54页 |
| 5.4.1 Hilbert transformation for the results of VMD | 第51-52页 |
| 5.4.2 TEO Demodulation for VMD results | 第52-54页 |
| 5.5 Chapter summary | 第54-55页 |
| 6 Experimental analysis | 第55-74页 |
| 6.1 Fault diagnosis experiment of rolling bearing | 第55-62页 |
| 6.1.1 EMD combined with Hilbert transform | 第57-59页 |
| 6.1.2 VMD combined with TEO Demodulation | 第59-62页 |
| 6.2 Fault diagnosis method verification of rolling bearing | 第62-73页 |
| 6.3 Chapter summary | 第73-74页 |
| Conclusions and outlooks | 第74-75页 |
| Conclusions | 第74页 |
| Outlooks | 第74-75页 |
| Acknowledgements | 第75-76页 |
| References | 第76-82页 |
| Paper and result published during the master | 第82页 |
