声明
摘要
Abstract
Content
Chapter 1 Introduction
1．1 Research Background
1．2 Structural composition and failure modes of motor bearings
1．3 Rolling bearing tribological failure
1．4 Appearances and manifestations of the different wear types
1．4．1 Abrasive wear
1．4．2 Adhesive wear
1．4．3 Surface fatigue wear
1．4．4 Erosive wear
1．4．5 Fretting wear
1．4．6 Corrosive wear
1．4．7 The electric source-shaft voltage
1．4．8 Magnetic flux asymmetry
1．4．9 Electrostatic effects
1．4．10 Non-circulating current
1．5 Fault tree analysis(FTA)
1．6 Lubrication of electrical contacts
1．6．1 Conductive Lubricant
1．7 Main research content
Chapter 2 preparation and characterization of materlals
2．1Preparation of lubrication(film)
2．2 Characterization of lubrication
2．2．1 Tribological friction test
2．2．2 Surface analysis
Chapter 3 Properties of lithium grease to analysis effect of few layer graphene additive on the tribological study
3．1 Introduction
3．2 Materials and Method
3．2．1 Materials
3．2．2 Preparation of lubricating grease
3．2．3 Friction test and characterization analysis of the friction surface
3．3 Result and Discussion
3．3．1 Characterization of FLG
3．3． 2 Tribological characteristic of the greases
3．3．3 Analysis of the worn surface
3．3．4 Discussion
3．4 Conclusion
Chapter 4 analysis on thermal functioning of ball bearing in the traction motor of a high-speed electric multi-unit
4．1 Introduction
4．2 Model establishment
4．2．1 Establishment of a finite element transient temperature solution model
4．2．2 Heat generation calculation
4．2．3 Convective heat transfer of bearings
4．2．4 Problem analysis
4．3 Correction of mathematical model
4．3．1 Correction method of empirical formula
4．4 Correction process
4．4．1 Selection of transient evaluation index
4．4．2 Empirical formula correction
4．5 Investigation of the thermal performance and temperature field
4．5．1 Investigation of the temperature distribution of the rolling bearing
4．5．2 Influence of speed and load on bearing temperature
4．6 Conclusion
Chapter 5 study for auto repairing effect of ionic liquids used as rolling element to enhance the performance of bearing operating under contaminate lubrication condition
5．1 Introduction
5．2 Experimental procedure
5．2．1 Material details
5．2．2 Procedure for creating artificial pit
5．2．3 Bearing life test
5．2．4 Finite element analysis
5．3 Result and discussion
5．3．1 Bearing life test results
5．3．2 Used oil analysis
5．3．3 Failure analysis of Sample 1 bearing using FEA
5．3．4 Repairing mechanism of Si3N4 balls
5．4 Conclusion
Chapter 6 Conclusion and Prospect
6．1 Conclusion
6．2 Prospect
References
Paper and other results published during the master’s degree
Acknowledgments
华北电力大学华北电力大学(北京);
