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Cover
1 Introduction
I I Porous Journal Bearings
12 Discussions of the Used Models
13 Outline of Thesis
2 Formation of the Problem
21 Porous Journal Bearing Geometry
22 Modified Reynolds Equation
23 Film Forces
24 Equations of Motion, of the Journal
3 Static Characteristics
3 I Bearing Characteristics
32 Short Bearing Approximation
321 Short Bearing Characteristics
322 Film pressure and Load Capacity
323 Attitude Angle and Friction Parameter
33 Long Bearing Approximation
331 Long Bearing Characteristics
332 Compared to That of a Long Solid Bearing
333 Load Number, Attitude Angle and Friction Parameter
34 Finite Porous Journal Bearing
341 Preconditioned Conjugate Gradient Method
342 Numerical Formulation
343 Finite Bearing Characteristics
344 Effect of a
345 Compared to That of a Finite Solid Bearing
346 Film pressure and Load Capacity
347 Attitude Angle and Friction Parameter
348 Compared to the Previous Work about Slip Effect
35 Conclusion of the Static Characteristics
4 Linear Stability Analysis
41 Dynamic Coefficients and Stability Criterion
42 Short Bearing Approximation
421 Effect of a and Compared to That of a Short Solid Bearing
422 Stiffness Coefficients
423 Damping Coefficients
424 Stability Threshold Speed
43 Long Bearing Approximation
431 Compared to That of a Long Solid Bearing
432 Stiffness Coefficients
433 Damping Coefficients
434 Stability Threshold Speed
44 Finite Porous Journal Bearings
441 Compared to That of a Finite Solid Bearing
442 Stiffness Coefficients
443 Damping Coefficients
444 Stability Threshold Speed
45 Conclusion of the Dynamic Characteristics
5 Weakly Nonlinear Stability Analysis
5 I Hopf Bifurcations
52 Meaning of Sub- and Super-critical Bifurcations
53 Introducing the System Parameter
54 Application of Hopf Bifurcation
55 Compared to That of a Short Solid Bearing
56 Weak-Nonlinear Stability Regions of Short Bearings
57 Hopf Bifurcation of Short Bearings
58 Conclusion of Bifurcation Phenomena for Short Bearings
6 Strongly Nonlinear Stability Analysis
61 Transient Response of the Journal for Short Porous Bearings
62 Nonlinear Stability Boundary of Short Porous Bearings
63 Conclusion of Strongly Nonlinear stability for Short Bearings
7 Concluding Remarks
71 Review of Results
72 Conclusion
73 Suggestions on Future Research
Appendix A Deriving the Modified Reynolds Equation
AI Expressions of u, u, w and w
A 2 Expressions of A\, D{, A@ and D@
A 3 Expressions of A and B
Appendix B Characteristics of Porous Bearings by Using the SFM and DM
B I Short Bearing Approximation
B 2 Long Bearing Approximation
B 3 Finite Porous Bearings
Appendix C Effect of Linear Pressure Gradient Assumption
C I Deriving the Modified Reynolds Equation
C 2 Bearing Characteristics
C 3 Effect of LPGA
C 4 Conclusion about the Effect of LPGA
References
List of Publications
Others
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