표제지
목차
약기호표 10
국문요약 13
Abstract 14
제1장 서론 15
1.1. 연구배경 및 연구목적 15
1.2. 연구동향 18
제2장 이론적 배경 19
2.1. 증발가스 압축기 구조 및 작동 원리 19
2.2. 밸브 유동 해석 21
2.2.1. 전달 유량 22
2.2.2. 밸브 운동방정식 30
2.3. 밸브 부품 탄성변형 예측 35
2.3.1. 스프링 강도 해석 36
제3장 밸브 유동특성 및 동특성에 따른 수치해석 37
3.1. 수치해석 37
3.1.1. 밸브 계 모델링 37
3.2.1. 고유진동수 해석 39
3.2.2. 고유진동수 해석 결과 43
3.3.1. 피로해석 49
3.3.2. 피로해석 결과 49
3.4.1. 밸브 시트의 충격을 가정한 STS Bar 충격 해석 50
3.4.2. 밸브 플레이트와 밸브 시트 충격 해석 결과 51
3.5.1. 밸브 플레이트 모션 해석 57
3.5.2. 밸브 플레이트 모션 해석 결과 59
3.6.1. 밸브 플레이트에 작용하는 최대 차압 조건에서 밸브 플레이트의 개도 정도에 따른 유량, 유속 해석 61
3.6.2. 밸브 플레이트에 작용하는 최대 차압 조건에서 밸브 플레이트가 열리는 정도에 따른 유량, 유속 해석 결과 61
3.7.1. 밸브 플레트가 1mm 열릴 때 밸브 플레이트에 작용하는 차압에 따른 정도에 따른 유량, 유속 해석 64
3.7.2. 밸브 플레트가 1mm 열릴 때 밸브 플레이트에 작용하는 차압에 따른 정도에 따른 유량, 유속 해석 결과 64
제4장 고찰 67
4.1. 재질, 두께 변화에 따른 고유진동수 67
4.2. 밸브 플레이트 동적해석 67
4.3. 밸브 유동해석 68
제5장 결론 69
참고문헌 71
Table. 1. BOG compressor cause failure distribution 16
Table. 2. Natural frequency value's comparison of valve plate & damping plate 43
Table. 3. Natural frequency value's comparison in the valve plate thickness 1t 44
Table. 4. Natural frequency value's comparison in the valve plate thickness 1.5t 45
Table. 5. Natural frequency value's comparison in the valve plate thickness 2.0t 46
Table. 6. Natural frequency value's comparison in the valve plate thickness 2.5t 47
Table. 7. Natural frequency value's comparison in the valve plate thickness 3.0t 48
Table. 8. Result of impact of the material analysis 51
Table. 9. Input value of the spring 58
Table. 10. Valve opening rate according to the height of the valve plate, a velocity, an acceleration, a reaction force spring 59
Table. 11. Flow rate, flow velocity of the valve opening rate according to the height of the valve plate 61
Table. 12. Flow rate, flow velocity, receiving power according to the differential pressure acting on the valve plate 65
Fig. 1. Installed BOG compressor 15
Fig. 2. BOG compressor suction/discharge valve 17
Fig. 3. BOG compressor 21
Fig. 4. Orifice Flow 23
Fig. 5. Valve seat & plate, Orifice flow 23
Fig. 6. A schematic of valve system 30
Fig. 7. Valve plate's mode of the cantilever 34
Fig. 8. Valve seat, Guard, Valve plate, Damping plate 38
Fig. 9. Valve plate's mesh 39
Fig. 10. Natural frequency value of valve plate mode 1 40
Fig. 11. Natural frequency value of valve plate mode 2 40
Fig. 12. Natural frequency value of valve plate mode 3 41
Fig. 13. Natural frequency value of valve plate mode 4 41
Fig. 14. Natural frequency value of valve plate mode 5 42
Fig. 15. Natural frequency value's comparison of valve plate & damping plate 43
Fig. 16. Natural frequency value's comparison in the valve plate thickness 1t 44
Fig. 17. In the first mode natural frequency changes according to the thickness of the stainless steel ANSI304 45
Fig. 18. Natural frequency value's comparison in the valve plate thickness 1.5t 45
Fig. 19. Natural frequency value's comparison in the valve plate thickness 2.0t 46
Fig. 20. Natural frequency value's comparison in the valve plate thickness 2.5t 47
Fig. 21. Natural frequency value's comparison in the valve plate thickness 3.0t 48
Fig. 22. Natural frequency value's comparison to the mode in the valve plate 3t 48
Fig. 23. Fatigue damage ratio according to the valve plate 49
Fig. 24. Fatigue life due to the valve plate 50
Fig. 25. Mesh for impact analysis 51
Fig. 26. Impact stress of the material (von-Mises stress) 52
Fig. 27. Z-Axis displacement, substantial strain according to the material 52
Fig. 28. Result of impact stress of the stainless steel ANSI 304 (von Mises stress) 53
Fig. 29. Z-Axis displacement according to time of stainless steel ANSI 304 53
Fig. 30. Z-Axis displacement according to time of aluminum alloys ANSI 4302 54
Fig. 31. Z-Axis displacement according to time of copper aluminum alloys 54
Fig. 32. von Mises stress according to time of stainless steel ANSI 304 55
Fig. 33. von Mises stress according to time of aluminum alloys ANSI 4302 55
Fig. 34. von Mises stress according to time of copper aluminum alloys 56
Fig. 35. Motion analysis 57
Fig. 36. A velocity of the valve opening rate according to the height of the valve plate 59
Fig. 37. An acceleration of the valve opening rate according to the height of the valve plate 60
Fig. 38. A reaction force spring of the valve opening rate according to the height of the valve plate 60
Fig. 40. Flow velocity of the valve opening rate according to the height of the valve plate 62
Fig. 41. Flow Simulation (CFD) 63
Fig. 42. Flow rate according to the differential pressure acting on the valve plate 65
Fig. 43. Flow velocity according to the differential pressure acting on the valve plate 66
Fig. 44. Receiving power according to the differential pressure acting on the valve plate 66