Title Page
Abstract
요약
Contents
NOMENCLATURE 16
SUBCRIPTS 17
GREEK LETTER SYMBOLS 18
CHAPTER 1. Introduction 19
1.1. Research Background 19
1.1.1. The air compressor development 19
1.1.2. The purpose of research 21
1.1.3. The methodology of research 22
1.2. Scope of Research 23
1.2.1. Compressor performance analysis 24
1.2.2. Transient structural analysis 24
CHAPTER 2. Theoretical Basic and The Mathematical and Numerical Approach 25
2.1. Mathematical formulation and computer simulation program 25
2.1.1. Kinematic 25
2.1.2. Valve Dynamic 26
2.1.3. Mass flow equation 28
2.1.4. Thermodynamic modelling 29
2.1.5. Heat transfer modeling 31
2.2. The Finite Element Method and Numerical Modelling for Air Compressor 32
2.2.1. The Finite Element Method 32
2.2.2. Numerical modelling 34
CHAPTER 3. The Mathematical Model and Computational Model Setup 36
3.1. The air compressor model test 36
3.2. The Mathematical Model of Air Compressor 39
3.3. The numerical model of air compressor 45
3.3.1. The geometry and mesh of air compressor model 45
3.3.2. The transient structural setup for air compressor model 46
3.3.3. The natural torsional analysis setup for air compressor model 47
CHAPTER 4. Results and Discussion 50
4.1. Overviews 50
4.2. The performance of air compressor model 50
4.3. The structural analysis of air compressor 53
4.3.1. Equivalent stress on Piston No.1 53
4.3.2. Equivalent stress on Piston No.2 54
4.3.3. Equivalent stress on Connecting rod No.1 55
4.3.4. Equivalent stress on Connecting rod No.2 56
4.3.5. Total deformation on Piston No.1 57
4.3.6. Total deformation on Piston No.2 58
4.3.7. Total deformation on Connecting rod No.1 59
4.3.8. Total deformation on Connecting rod No.2 61
4.3.9. Safety factor of Pistons No.1 and No.2 63
4.3.10. Safety factor of Connecting Rods No.1 and No.2 64
4.4. The natural torsional analysis 66
CHAPTER 5. Experimental Apparatus, Procedure and Results 71
5.1. Experimental Apparatus 71
5.2. Experimental Procedure and Results 75
CHAPTER 6. Conclusions 79
6.1. Conclusions 79
6.2. Future research 80
APPENDICES 81
REFERENCES 91
Table 3.1. General geometry 37
Table 3.2. Material Descriptions 38
Table 3.3. Operating conditions 38
Table 3.4. Air Compressor Materials Properties 46
Table 4.1. Natural Torsional Mode of air compressor 70
Table 4.2. API 618 criteria comparison 70
Table 5.1. Compressed Air Unit Testing Results 77
Table 5.2. Comparison between targets and performances 78
Fig. 1.1. Air compressor types 19
Fig. 2.1. Slider Crank Mechanism model 25
Fig. 2.2. Dynamic model of suction and discharge valves 27
Fig. 2.3. The P-V diagram for compressor 29
Fig. 2.4. Control volume of compressor cylinder 30
Fig. 3.1. The air compressor main body 36
Fig. 3.2. Flowchart for reciprocating air compressor simulation using first law... 41
Fig. 3.3. Flowchart for reciprocating air compressor simulation using first law... 42
Fig. 3.4. Flowchart for reciprocating air compressor simulation using first law... 43
Fig. 3.5. Flowchart for reciprocating air compressor simulation using first law... 44
Fig. 3.6. Model of air compressor for transient structural analysis 45
Fig. 3.7. Meshing Geometry of air compressor for transient structural analysis 45
Fig. 3.8. The load applied on air compressor 47
Fig. 3.9. Shaft system of GBS-70 air compressor 48
Fig. 3.10. Point mass replacement of GBS-70 air compressor 48
Fig. 3.11. Pressure on piston No.1 and No.2 diagram 49
Fig. 4.1. Pressure signal in cylinder of air compressor 50
Fig. 4.2. Temperature signal in cylinder of air compressor 51
Fig. 4.3. Suction valve displacement in cylinder of air compressor 52
Fig. 4.4. Discharge valve displacement in cylinder of air compressor 52
Fig. 4.5. Maximum equivalent stress on Piston No.1 53
Fig. 4.6. Maximum equivalent stress contour on Piston No.1 54
Fig. 4.7. Maximum equivalent stress on Piston No.2 54
Fig. 4.8. Maximum equivalent stress contour on Piston No.2 55
Fig. 4.9. Maximum equivalent stress on Connecting rod No.1 56
Fig. 4.10. Maximum equivalent stress contour on Connecting rod No.1 56
Fig. 4.11. Maximum equivalent stress on Connecting rod No.2 57
Fig. 4.12. Maximum total deformation on Piston No.1 57
Fig. 4.13. Maximum total deformation contour on Piston No.1 58
Fig. 4.14. Maximum total deformation on Piston No.2 58
Fig. 4.15. Maximum total deformation contour on Piston No.2 59
Fig. 4.16. Maximum total deformation on Connecting rod No.1 59
Fig. 4.17. Maximum total deformation contour of Connecting Rod No.1 (at 135˚) 60
Fig. 4.18. Maximum total deformation contour of Connecting Rod No.1 (at 225˚) 60
Fig. 4.19. Maximum total deformation on Connecting rod No.2 61
Fig. 4.20. Maximum total deformation contour of Connecting Rod No.2 (at 135˚) 61
Fig. 4.21. Maximum total deformation contour of Connecting Rod No.2 (at 225˚) 62
Fig. 4.22. Safety factor of piston No.1 63
Fig. 4.23. Safety factor of piston No.2 64
Fig. 4.24. Safety factor of connecting rod No.1 64
Fig. 4.25. Safety factor of connecting rod No.2 65
Fig. 4.26. (a) (b) 1st torsional vibration mode of compressor system at f = 0.41033...(이미지참조) 66
Fig. 4.26. (c) (d) 1st torsional vibration mode of compressor system at f = 0.41033...(이미지참조) 66
Fig. 4.27. (a) (b) 2nd torsional vibration mode of compressor system at f = 515.69...(이미지참조) 67
Fig. 4.27. (c) (d) 2nd torsional vibration mode of compressor system at f = 515.69...(이미지참조) 67
Fig. 4.28. (a) (b) 3rd torsional vibration mode of compressor system at f = 517.2...(이미지참조) 68
Fig. 4.28. (c) (d) 3rd torsional vibration mode of compressor system at f = 517.2...(이미지참조) 68
Fig. 4.29. (a) (b) 4th torsional vibration mode of compressor system at f = 1782.8...(이미지참조) 69
Fig. 4.29. (c) (d) 4th torsional vibration mode of compressor system at f = 1782.8...(이미지참조) 69
Fig. 5.1. The experimental air compressor unit diagram 71
Fig. 5.2. Iinternal parts of air compressor 72
Fig. 5.3. The air compressor box 73
Fig. 5.4. Compressed Air Supply Unit Experiment 73
Fig. 5.5. The measurement equipment of air compressor 74
Fig. 5.6. The measurement equipment results in 3rd test(이미지참조) 76