표제지
목차
Abstract 6
Terminology 11
제1장 서론 13
1.1. 연구의 배경 13
1.2. 연구의 목적 17
1.3. 연구의 내용 및 구성 18
제2장 선행연구 고찰 20
2.1. 전심의 정의 20
2.2. 전심의 위치 변화 요인 26
2.2.1. 횡저항 중심의 이동 26
2.2.2. 수저항력의 변화 33
제3장 쌍추진 선박의 전심 위치 변화 분석 38
3.1. 2축2타 나선 프로펠러 조종특성 분석 40
3.1.1. FPP 2축 나선 프로펠러 선박 40
3.1.2. CPP 2축 나선 프로펠러 선박 42
3.2. Water Jet 조종특성 분석 43
3.2.1. DRB(Double Reverse Bucket) 노즐 조향방식 45
3.2.2. SRB(Single Reverse Bucket) 버켓 조향방식 50
3.2.3. DRB 노즐 조향방식과 SRB 버켓 조향방식 비교 54
3.2.4. SRB 버켓 조향방식 Push-Pull Mode 조종의 문제점 58
3.3. 선박조종시뮬레이션을 통한 전심 위치 분석 60
3.3.1. 시뮬레이터 제원 및 대상선박 60
3.3.2. 횡추력에 의한 전심의 위치 변화 64
3.3.3. Push-Pull Mode에서 추력 분석 72
3.3.4. Push-Pull Mode 종류별 전심 위치 분석 80
3.4. 소결론 90
제4장 전심 위치를 활용한 Push-Pull Mode 제안 92
4.1. Push-Pull Mode에 전심 위치 적용 92
4.1.1. 2축2타 Push-Pull Mode에서 전심 변화 92
4.1.2. 나선 프로펠러와 Water Jet 횡이동 비교 분석 95
4.2. 전심 위치를 활용한 Push-Pull Mode 제안 100
4.2.1. 접·이안 상황별 전심 위치 적용 100
4.2.2. 쌍추진기 종류별 조종 모델 제시 109
4.3. 소결론 118
제5장 결론 120
참고문헌 122
Table 1. Existing pivot point's theory 20
Table 2. Comparison of pivot point's definition with numerical formula 25
Table 3. Simulator specification and SHS condition 61
Table 4. Tested ship information for ship handling simulation 63
Table 5. SHS test items for twin propulsion water jet 80
Table 6. Xp change for test item (b) 84
Table 7. Applications by berthing-unberthing situation 100
Table 8. Analysis of pros and cons in fore spring tension 101
Table 9. Analysis pros and cons when unberthing the stern first 104
Table 10. Analysis advantage in one type of push-pull mode 105
Table 11. Maneuvering model for propulsion type 109
Fig. 1. Sideways motion and rotation on friction free surface 22
Fig. 2. Elements for pivot point's definition 24
Fig. 3. Model of rotation moment (r) generation by COLR 27
Fig. 4. COLR and position change 30
Fig. 5. Variation of COLR and dependent pivot point with UKC 33
Fig. 6. Change of pivot point depending on acting point of force 34
Fig. 7. Rotation in the opposite direction by SGSC 36
Fig. 8. Shoulder moment in push-pull mode 39
Fig. 9. Characteristic of reverse & stop in DRB nozzle steering type 45
Fig. 10. Characteristic of stop & steering in DRB nozzle steering type 46
Fig. 11. Push-pull mode in DRB nozzle steering (Case 1) 47
Fig. 12. Push-pull mode in DRB nozzle steering (Case 2) 48
Fig. 13. Steering comparison of DRB and SRB (Case 1) 50
Fig. 14. Steering comparison of DRB and SRB (Case 2) 51
Fig. 15. Maneuvering with bucket control lever in SRB steering type 52
Fig. 16. Comparison of maneuverability in 2 types of water jet (Case 1) 55
Fig. 17. Comparison of maneuverability in 2 types of water jet (Case 2) 56
Fig. 18. Shoulder moment reduction in push-pull with steering wheel 58
Fig. 19. Analysis of pivot point's position by bow thruster 65
Fig. 20. Xp change curve by u in situation of Fig. 19 66
Fig. 21. Analysis of pivot point's position by stern thruster 67
Fig. 22. Xp change curve by u in situation of Fig. 21 68
Fig. 23. Test with increased VF in situation of Fig. 19 (A) 70
Fig. 24. Xp which varies according to propulsion strength 72
Fig. 25. Analysis of thruster elements for crabbing 74
Fig. 26. Comparison of two kinds of push-pull mode for crabbing 77
Fig. 27. Test for weather condition capable of crabbing 79
Fig. 28. Xp change for test items (a), (d) 81
Fig. 29. Acting point of lateral force depends on push-pull mode 82
Fig. 30. DRB nozzle steering type characteristic with Xp 85
Fig. 31. Xp change for test items (b), (e), (f) 86
Fig. 32. Crabbing SHS for test item 89
Fig. 33. Different pivot point by acting point of lateral force 92
Fig. 34. Comparing thrust generation to make crabbing (Case 1) 95
Fig. 35. Comparing thrust generation to make crabbing (Case 2) 97
Fig. 36. Comparing thrust generation of water jet and propeller 98
Fig. 37. Push-pull model for reducing tension of fore spring 101
Fig. 38. Push-pull model for safe distance between ship's bow & pier 103
Fig. 39. Pivot point's change by steering angle in push-pull mode 105
Fig. 40. Positions of action of force according to rudder angle 107
Fig. 41. Sideway berthing model through push-pull mode 110
Fig. 42. Harbor maneuvering model for DRB nozzle steering type 113
Fig. 43. Harbor maneuvering model for SRB bucket steering type 115