표제지
목차
ABSTRACT 9
I. 서론 11
1.1. 연구배경 11
1.2. 문헌조사 12
1.3. 연구 목적 및 내용 14
II. 위상 최적설계의 기본 개념 16
2.1. 균질화법을 이용한 위상 최적설계 16
2.2. 위상 최적설계의 정식화 21
2.3. 선형 정하중 문제의 정식화 24
III. 재래설계와 최적설계 과정 27
IV. 유니버설 페어리더 유한요소해석 30
4.1. 초기형상 및 시스템 30
4.2. 유한요소 모델링 및 경계조건 35
4.3. 초기모델의 유한요소 해석 결과 40
4.3.1 결과 분석 44
4.4. 위상 최적설계 수행 45
4.4.1. 문제 정식화 45
4.4.2. 설계 영역과 비설계 영역 지정 46
4.4.3. 위상 최적설계 결과 48
4.4.4. 결과 분석 50
4.5. 최적형상에 대한 유한요소 해석 수행 52
4.5.1. 최적형상의 3D 및 유한요소 모델링 52
4.5.2. 최적형상의 유한요소 해석 결과 55
4.5.3. 보강형상의 3D 및 유한요소 모델링 59
4.5.4. 보강형상의 유한요소 해석 결과 62
V. 결론 66
참고 문헌 68
감사의 글 71
Table 1. Material Properties of Universal Fairleader 32
Table 2. The Number of Element and Node 36
Table 3. Maximum stress for each part (Von-Mises) 40
Table 4. The comparison of weight between initial shape and optimized shape 51
Table 5. The Comparison of maximum stress between initial shape and optimized shape 55
Table 6. The Comparison of maximum stress among initial shape, optimized shape and optimized shape with stiffner 62
Fig. 1. A structure with composite microstructure 17
Fig. 2. Design variables a, b and c for a solid design element 18
Fig. 3. A basic concept of the topology optimization using homogenization method 20
Fig. 4. The generalized model for the topology design 22
Fig. 5. Conventional design process 27
Fig. 6. Optimum design process 28
Fig. 7. Whole 3D model of Universal Fairleader 32
Fig. 8. 3D model for Cover(left) and Bearing A(right) 33
Fig. 9. 3D model for Bearing B(left) and Bearing C(right) 33
Fig. 10. 3D model for Frame A 34
Fig. 11. 3D model for Frame B 34
Fig. 12. Finite element modeling for whole model 37
Fig. 13. Finite element modeling for Cover(left) and Bearing A(right) 37
Fig. 14. Finite element modeling for Bearing B(left) and C(right) 38
Fig. 15. Finite element modeling for Frame A 38
Fig. 16. Finite element modeling for Frame B 39
Fig. 17. FE analysis result for whole model 41
Fig. 18. FE analysis result for Cover(left) and Bearing A(right) 41
Fig. 19. FE analysis result for Bearing B(left) and C(right) 42
Fig. 20. FE analysis result for Frame A 42
Fig. 21. FE analysis result for Frame B 43
Fig. 22. Design space for Universal Fairleader 47
Fig. 23. Non-design space for Universal Fairleader 47
Fig. 24. Optimum analysis result of Universal Fairleader 49
Fig. 25. The comparison of 3D model between initial shape and optimized shape 51
Fig. 26. Optimal shape of whole model 52
Fig. 27. Finite element model of optimized whole model 53
Fig. 28. Optimal shape of Frame A 53
Fig. 29. Finite element model of optimized Frame A 54
Fig. 30. FE analysis result for optimized whole model 56
Fig. 31. FE analysis result for optimized Cover(left) and Bearing A(right) 56
Fig. 32. FE analysis result for optimized Bearing B(left) and C(right) 57
Fig. 33. FE analysis result for optimized Frame A 57
Fig. 34. FE analysis result for optimized Frame B 58
Fig. 35. Optimal shape of whole model with stiffner 59
Fig. 36. Finite element model of optimized whole model with stiffner 60
Fig. 37. Optimal shape of Frame A with stiffner 60
Fig. 38. Finite element model of optimized Frame A with stiffner 61
Fig. 39. FE analysis result for optimized whole model with stiffner 63
Fig. 40. FE analysis result for optimized Cover(left) and Bearing A(right) with stiffner 63
Fig. 41. FE analysis result for optimized Bearing B(left) and C(right) with stiffner 64
Fig. 42. FE analysis result for optimized Frame A with stiffner 64
Fig. 43. FE analysis result for optimized Frame B with stiffner 65