표제지
목차
Abstract 12
제1장 서론 17
1.1. 연구 배경 및 목적 17
1.2. 논문 구성 21
제2장 선박 추진축계의 종·비틀림 연성진동 23
2.1. 연료절약형 선박용 엔진 개발 동향 23
2.2. 선박용 엔진의 기진력 요소 28
2.2.1. 비틀림진동 기진력 28
2.2.2. 종진동 기진력 37
2.2.3. 엔진의 기진모멘트 및 불평형우력 41
2.3. 종·비틀림 연성진동 49
2.3.1. 다실린더 엔진의 종·비틀림 연성진동 49
2.3.2. 크랭크 축계 각부의 종·비틀림 연성 강성계수 55
2.3.3. 축계 전체의 강성 매트릭스와 질량 매트릭스 62
2.4. 종·비틀림 연성진동 해석 66
2.4.1. 자유진동 해석 66
2.4.2. 강제진동 해석 70
2.5. 종·비틀림 연성진동 대책 76
2.5.1. 종·비틀림 연성진동 특성과 평가 76
2.5.2. 종비틀림 연성진동 대책 76
제3장 실험 및 고찰 78
3.1. 개요 78
3.1.1. 진동 측정 방법 78
3.1.2. 진동 측정 조건 82
3.2. 사례 연구 1 (70㎝ 급 내경 엔진) 84
3.2.1. 엔진 주요 요목 84
3.2.2. Model A (6S70MC-C7) 엔진 진동 측정 85
3.2.3. Model B (W6X72) 엔진 진동 측정 88
3.2.4. 소결론 92
3.3. 사례 연구 2 (80㎝ 급 내경 엔진) 95
3.3.1. 엔진 주요 요목 95
3.3.2. Model C (7RTX82T) 엔진 진동 측정 96
3.3.3. Model D (7G80ME-C9.2) 엔진 진동 측정 100
3.3.4. 소결론 107
3.4. 사례 연구 3 (90㎝ 급 내경 엔진) 111
3.4.1. 엔진 주요 요목 111
3.4.2. Model E (11G90ME-C10.5) 엔진 진동 측정 112
3.4.3. Model F (11S90ME-C9.2) 엔진 진동 측정 121
3.4.4. 소결론 124
제4장 결론 129
4.1. 결론 129
4.2. 향후연구 131
참고문헌 132
Table 2.1. Partitions number of crankshaft FEM model 56
Table 3.1. Specification of Model A and B Engine 84
Table 3.2. Natural frequencies of torsional vibration(6S70MC-C7, Model A) 92
Table 3.3. Natural frequencies of torsional vibration(W6X72, Model B) 92
Table 3.4. Specification of Model C and D Engine 95
Table 3.5. Natural frequencies of torsional vibration(7RTX82T, Model C) 107
Table 3.6. Natural frequencies of torsional vibration(7G80ME-C9.2, Model D) 107
Table 3.7. Natural frequencies of axial vibration(7G80ME-C9.2, Model D) 109
Table 3.8. Specification of Model E and F Engine 111
Table 3.9. Natural frequencies of torsional vibration(11G90ME-C10.5, Model E) 124
Table 3.10. Natural frequencies of torsional vibration(11S90ME-C9.2, Model F) 124
Table 3.11. Natural frequencies of axial vibration(11G90ME-C10.5, Model E) 126
Figure 1.1. First Diesel Engine (MAN 25/40) 18
Figure 1.2. Fractured intermediate shaft 19
Figure 2.1. One of two Burmeister & Wain DM8150X engines... 25
Figure 2.2. MAN 12S90ME engine 26
Figure 2.3. Fuel saving type engine 26
Figure 2.4. Proportional Valve 27
Figure 2.5. Tangential force of crankshaft[원문불량;p.13] 29
Figure 2.6. Radial force of crankshaft[원문불량;p.22] 38
Figure 2.7. Direction of the reaction moments and displacements... 40
Figure 2.8. Guide force of crankshaft and connection rod[원문불량;p.26] 42
Figure 2.9. X-moment for diesel engine[원문불량;p.28] 44
Figure 2.10. External force of one cylinder engine[원문불량;p.31] 47
Figure 2.11. Model of crankshaft 49
Figure 2.12. FEM model of crank throw 56
Figure 2.13. The result of FEM model 57
Figure 2.14. Division of a single crank throw 59
Figure 2.15. Matrix of a single crank throw 59
Figure 2.16. Model method of crank throw[원문불량;p.45] 61
Figure 3.1. Illustrated intermediate shaft 80
Figure 3.2. Strain gauge 80
Figure 3.3. Wheatstone bridge 81
Figure 3.4. Schematic diagram for torsional and axial vibration measurement 81
Figure 3.5. Position of vibration measurement 83
Figure 3.6. Torsional stress between turning wheel and flange... 85
Figure 3.7. The order tracking result for torsional stress between turning... 85
Figure 3.8. Torsional stress between turning wheel and flange in No. 4... 86
Figure 3.9. The order tracking result for torsional stress between turning... 86
Figure 3.10. Axial displacement amplitude of crankshaft free end in... 87
Figure 3.11. The order tracking result for axial displacement amplitude of... 87
Figure 3.12. Calculated torsional stress at intermediate shaft 88
Figure 3.13. Measured torsional stress at intermediate shaft 88
Figure 3.14. Calculated torsional stress at intermediate shaft 89
Figure 3.15. Measured torsional stress at intermediate shaft 89
Figure 3.16. Measured axial displacement amplitude of crankshaft free... 90
Figure 3.17. Measured torsional stress at intermediate shaft... 90
Figure 3.18. Measured torsional stress at intermediate shaft... 91
Figure 3.19. Torsional stress at intermediate shaft in normal firing... 96
Figure 3.20. Torsional stress at intermediate shaft in normal firing... 96
Figure 3.21. The waterfall graph for torsional stress at intermediate shaft... 97
Figure 3.22. Calculated torsional stress at intermediate shaft... 97
Figure 3.23. Measured torsional stress at intermediate shaft... 98
Figure 3.24. The waterfall graph for torsional stress at intermediate shaft... 98
Figure 3.25. The order tracking result for axial displacement amplitude of... 99
Figure 3.26. The waterfall graph for axial displacement amplitude of... 99
Figure 3.27. Torsional stress at intermediate shaft in normal firing... 100
Figure 3.28. Torsional stress at intermediate shaft in normal firing... 100
Figure 3.29. Calculated torsional stress at intermediate shaft... 101
Figure 3.30. Measured torsional stress at intermediate shaft... 101
Figure 3.31. Measured torsional stress at intermediate shaft during the... 102
Figure 3.32. Measured torsional stress at intermediate shaft during the... 102
Figure 3.33. Mass spring system for axial vibration 103
Figure 3.34. Axial displacement amplitude at crankshaft free end 103
Figure 3.35. Axial displacement amplitude at thrust bearing (calculation) 104
Figure 3.36. Thrust variation force at thrust bearing (calculation) 104
Figure 3.37. Axial displacement amplitude at crankshaft free end 105
Figure 3.38. Axial displacement amplitude at intermediate shaft 105
Figure 3.39. Thrust variation force based on measured axial displacement... 106
Figure 3.40. Calculated torsional stress at intermediate shaft 112
Figure 3.41. Measured torsional stress at intermediate shaft 112
Figure 3.42. Calculated torsional stress at intermediate shaft 113
Figure 3.43. Measured torsional stress at intermediate shaft 113
Figure 3.44. Torsional vibration stress at chain drive (crankshaft) 114
Figure 3.45. Angular displacement amplitude at propeller 114
Figure 3.46. Mass spring system for axial vibration 115
Figure 3.47. Mode shape for axial vibration 115
Figure 3.48. Axial displacement amplitude at crankshaft free end 116
Figure 3.49. Thrust force at axial damper 116
Figure 3.50. Axial displacement amplitude at thrust bearing 117
Figure 3.51. Thrust force at thrust bearing 117
Figure 3.52. Axial displacement amplitude at crankshaft free end (measurement) 118
Figure 3.53. Axial displacement amplitude at intermediate shafe (measurement) 118
Figure 3.54. Velocity amplitude of main engine fore-top at longitudinal... 119
Figure 3.55. Velocity amplitude of main engine fore-top accessary... 119
Figure 3.56. Recalculated axial displacement amplitude including the 2nd...(이미지참조) 120
Figure 3.57. Recalculated thrust force including the 2nd order excitation...(이미지참조) 120
Figure 3.58. Calculated torsional stress at intermediate shaft 121
Figure 3.59. Measured torsional stress at intermediate shaft 121
Figure 3.60. Calculated torsional stress at intermediate shaft 122
Figure 3.61. Measured torsional stress at intermediate shaft 122
Figure 3.62. Measured axial amplitudes at crankshaft free end 123