표제지
목차
Abstract 12
제1장 서론 13
1.1. 연구의 목적과 개요 13
1.2. 선박 특성 14
1.2.1. 선종 및 선급 14
1.2.2. 주요 제원 14
1.2.3. 추진기 14
1.2.4. 타 14
1.2.5. 조타기 15
제2장 유동해석 16
2.1. 개요 16
2.2. 유체력 추정 16
2.2.1. 해석모델 16
2.2.2. 해석 조건 17
2.2.3. 해석 지표 18
2.2.4. 해석 결과 18
2.3. 해석모델과 격자 18
2.3.1. 해석모델 18
2.3.2. 격자 19
2.4. 해석 방법 21
2.4.1. 물리적 모델 21
2.4.2. 해석영역 및 경계조건 21
2.5. 타각 0˚ 결과 22
2.5.1. 타에 작용하는 유체력 22
2.5.2. 해석 결과 24
2.6. 타각 35˚ 결과 (좌현) 27
2.6.1. 타에 작용하는 유체력 27
2.6.2. 해석 결과 29
2.7. 타각 10˚ 결과 (좌현) 31
2.7.1. 타에 작용하는 유체력 31
2.7.2. 해석 결과 33
2.8. 결론 36
제3장 유한요소해석 37
3.1. 참고 도면 37
3.2. 좌표계 37
3.3. 단위 37
3.4. 해석 프로그램 37
3.5. 유한요소 모델링 38
3.5.1. 유한요소 모델 38
3.5.2. 요소 타입 41
3.5.3. 격자 모델링 41
3.5.4. 물성치 43
3.5.5. 허용응력 43
3.5.6. 경계조건 43
3.5.7. 하중조건 44
3.5.8. 조타기 45
3.5.9. 연결부 46
제4장 구조강도해석 48
4.1. 타각 0˚ 48
4.2. 타각 35˚ (port turn) 59
제5장 동해석 69
5.1. 베어링의 등가강성(Equivalent stiffness) 69
5.2. 고유진동수와 모드형상 70
5.2.1. 타각 0˚ 70
5.2.2. 타각 35˚ 74
5.3. 과도응답 78
5.3.1. 타각 0˚ 79
5.3.2. 타각 35˚ 86
제6장 결론 94
참고문헌 97
Bibliography 98
Appendix 99
Table 1. Initial guess for the steady state calculations 22
Table 2. Number of elements and nodes at 0˚ 41
Table 3. Number of elements and nodes at 10˚ 42
Table 4. Number of elements and nodes at 35˚ 42
Table 5. Allowable Von Mises stress 43
Table 6. Deviation between class-rule requirements and analysis result 94
Fig. 1. Blade position as per defined in CAD files rudder angle=0˚ 17
Fig. 2. Calculation domain 19
Fig. 3. Meshing (global view) 20
Fig. 4. Meshing (stationary and rotating) 20
Fig. 5. Meshing (boundary layer) 20
Fig. 6. Boundary conditions 21
Fig. 7. Axial force on rudder 23
Fig. 8. Transverse force on rudder 23
Fig. 9. Vertical force on rudder 24
Fig. 10. Absolute pressure field on the rudder 25
Fig. 11. velocity field in ship wake 25
Fig. 12. velocity field on the rudder 26
Fig. 13. Streamlines in the ship wake 26
Fig. 14. Streamlines on the rudder surface (oil flow) 27
Fig. 15. Axial force on rudder 27
Fig. 16. Transverse force on rudder 28
Fig. 17. Vertical force on rudder 28
Fig. 18. Absolute pressure field on the rudder 29
Fig. 19. velocity field in ship wake 30
Fig. 20. velocity field on the rudder 30
Fig. 21. Streamlines in the ship wake 31
Fig. 22. Streamlines on the rudder surface (oil flow) 31
Fig. 23. Axial force on rudder 32
Fig. 24. Transverse force on rudder 32
Fig. 25. Vertical force on rudder 33
Fig. 26. Absolute pressure field on the rudder 34
Fig. 27. (a) velocity field in ship wake 34
Fig. 27. (b) velocity field in ship wake 35
Fig. 28. Streamlines on the rudder surface (oil flow) 35
Fig. 29. FEM model 38
Fig. 30. 0˚ angle FEM model 39
Fig. 31. 35˚ angle FEM model 39
Fig. 32. Rudder model 40
Fig. 33. Hull beneath steering gear deck 40
Fig. 34. Boundary conditions 43
Fig. 35. Buoyancy force 44
Fig. 36. Fluid mesh - angle 0˚ 44
Fig. 37. Fluid mesh - angle 35˚ 45
Fig. 38. Steering gear 45
Fig. 39. Vertical support and upper bearing 46
Fig. 40. Lower bearing 47
Fig. 41. Rudder angle 0˚ - Deformed model (scale factor deformation: 200) 48
Fig. 42. Rudder angle 0˚ - Deformed model (scale factor deformation: 200) 49
Fig. 43. Rudder angle 0˚ - Deformed model (scale factor deformation: 200) 49
Fig. 44. Rudder angle 0˚ - Contact area between stock and disk bearing 50
Fig. 45. Rudder angle 0˚ - Contact pressure between stock and disk bearing 50
Fig. 46. Rudder angle 0˚ - Contact area between stock and upper bearing 51
Fig. 47. Rudder angle 0˚ - Contact pressure between stock and upper bearing 51
Fig. 48. Rudder angle 0˚ - Contact area between stock and lower bearing 52
Fig. 49. Rudder angle 0˚ - Contact pressure between stock and lower bearing 52
Fig. 50. Rudder angle 0˚ - Von Mises stresses in steering gear deck 53
Fig. 51. Rudder angle 0˚ - Von Mises stresses in hull below steering gear deck 53
Fig. 52. Rudder angle 0˚ - Von Mises stresses in skeg 54
Fig. 53. Rudder angle 0˚ - Von Mises stresses in rudder blade (greater than 10 MPa) 54
Fig. 54. Rudder angle 0˚ - Von Mises stresses in skeg and rudder blade 55
Fig. 55. Rudder angle 0˚ - Von Mises stresses in rudder stock 56
Fig. 56. Rudder angle 0˚ - Von Mises stresses in the lower bearing 57
Fig. 57. Rudder angle 0˚ - Von Mises stresses in upper bearing (greater than 10 MPa) 58
Fig. 58. Rudder angle 0˚ - Von Mises stresses in lower bearing (greater than 10 MPa) 58
Fig. 59. Rudder angle 35˚ - Deformed model (scale factor deformation: 50) 59
Fig. 60. Rudder angle 35˚ - Deformed model (scale factor deformation: 50) 59
Fig. 61. Rudder angle 35˚ - Deformed model (scale factor deformation: 50) 60
Fig. 62. Rudder angle 35˚ - Area of contact between stock and disk bearing 60
Fig. 63. Rudder angle 35˚ - Contact pressure between stock and disk bearing 61
Fig. 64. Rudder angle 35˚ - Area of contact between stock and upper bearing 61
Fig. 65. Rudder angle 35˚ - Contact pressure in the upper bearing 62
Fig. 66. Rudder angle 35˚ - Area of contact between stock and lower bearing 62
Fig. 67. Rudder angle 35˚ - Contact pressure in the lower bearing 63
Fig. 68. Rudder angle 35˚ - Von Mises stresses in steering gear deck 63
Fig. 69. Rudder angle 35˚ - Von Mises stresses in hull below steering gear deck 64
Fig. 70. Rudder angle 35˚ - Von Mises stresses in skeg and rudder blade 64
Fig. 71. Rudder angle 35˚ - Von Mises stresses in rudder blade (greater than 10 MPa) 65
Fig. 72. Rudder angle 35˚ - Von Mises stresses in skeg 66
Fig. 73. Rudder angle 35˚ - Von Mises stresses in rudder stock 66
Fig. 74. Rudder angle 35˚ - Von Mises stresses in upper bearing 67
Fig. 75. Rudder angle 35˚ - Von Mises stresses in upper bearing (greater than 10 MPa) 67
Fig. 76. Rudder angle 35˚ - Von Mises stresses in upper bearing (greater than 10 MPa) 68
Fig. 77. Rudder angle 35˚ - Von Mises stresses in lower bearing (greater than 10 MPa) 68
Fig. 78. Equivalent springs in the lower bearing - Rudder angle 0˚ 70
Fig. 79. Equivalent springs in the bearings - Rudder angle 35˚ 70
Fig. 80. Rudder angle 0˚ - 1st mode - f=2.27 Hz 71
Fig. 81. Rudder angle 0˚ - 2nd mode - f=4.14 Hz 72
Fig. 82. Rudder angle 0˚ - 3rd mode - f=5.26 Hz 73
Fig. 83. Rudder angle 0˚ - 4th mode - f=7.68 Hz 74
Fig. 84. Rudder angle 35˚ - 1st mode - f=2.73 Hz 75
Fig. 85. Rudder angle 35˚ - 2nd mode - f=5.03 Hz 76
Fig. 86. Rudder angle 35˚ - 3rd mode - f=5.72 Hz 77
Fig. 87. Rudder angle 35˚ - 4th mode - f=9.77 Hz 78
Fig. 88. Rudder angle 0˚ - Von Mises stresses in the structure 79
Fig. 89. Rudder angle 0˚ - Von Mises stresses in the structure 79
Fig. 90. Rudder angle 0˚ - Von Mises stresses in skeg and rudder blade 80
Fig. 91. Rudder angle 0˚ - Von Mises stresses in skeg and rudder blade 80
Fig. 92. Rudder angle 0˚ - Von Mises stresses in skeg 81
Fig. 93. Rudder angle 0˚ - Von Mises stresses in skeg and rudder blade 81
Fig. 94. Rudder angle 0˚ - Von Mises stresses in rudder blade 82
Fig. 95. Rudder angle 0˚ - Von Mises stresses in rudder stock 83
Fig. 96. Rudder angle 0˚ - Von Mises stresses in rudder stock 84
Fig. 97. Rudder angle 0˚ - Von Mises stresses in the upper bearing 85
Fig. 98. Rudder angle 0˚ - Von Mises stresses in the lower bearing 85
Fig. 99. Rudder angle 35˚ - Von Mises stresses in the structure 86
Fig. 100. Rudder angle 35˚ - Von Mises stresses in the structure 86
Fig. 101. Rudder angle 35˚ - Von Mises stresses in the steering gear deck 87
Fig. 102. Rudder angle 35˚ - Von Mises stresses in hull below steering gear deck 87
Fig. 103. Rudder angle 35˚ - Von Mises stresses in skeg 87
Fig. 104. Rudder angle 35˚ - Von Mises stresses in skeg and rudder blade 88
Fig. 105. Rudder angle 35˚ - Von Mises stresses in rudder blade 89
Fig. 106. Rudder angle 35˚ - Von Mises stresses in rudder stock with sleeves 90
Fig. 107. Rudder angle 35˚ - Von Mises stresses in rudder stock without sleeves 91
Fig. 108. Rudder angle 35˚ - Von Mises stresses in rudder stock without sleeves 92
Fig. 109. Rudder angle 35˚ - Von Mises stresses in the upper bearing 92
Fig. 110. Rudder angle 35˚ - Von Mises stresses in the lower bearing 93