표제지
목차
기호설명 7
제1장 서론 16
1.1. 연구배경 16
1.2. 연구내용 19
제2장 이론해석 20
2.1. 시스템 모델 20
가) 물리적 모델 20
2.2. 수학적 모델 24
가) 수학적 모델 25
제3장 컴퓨터 시뮬레이션 41
3.1. 알고리즘 41
가) 수직실린더의 경우 41
나) 수평실린더의 경우 41
3.2. 프로그래밍 43
가) 수직실린더 43
나) 수평실린더 43
다) 유출능력계수, 누설계수 및 댐핑계수 결정 44
3.3. 고찰 44
제4장 실험 및 고찰 47
4.1. 실험 47
4.2. 고찰 50
제5장 온도특성 연구 61
5.1. 온도특성 61
5.2. 열전달 특성 및 결과고찰 71
제6장 설계에 대한 연구 74
6.1. 쿠션설계 특성 74
가) 쿠션슬리브 길이 영향 74
나) 외부하중의 영향 74
다) 스트로크의 영향 77
라) 실린더 입, 출구포트 단면적의 영향 77
마) 쿠션오리피스 단면적의 영향 77
6.2. 쿠션 성능 평가 81
6.3. 고찰 84
제7장 속도제어에 대한 연구 85
7.1. 속도제어특성 85
가) 실험방법 86
7.2. 결과고찰 89
(1) 메타인 제어 시스템의 경우 89
(2) 메타아웃 제어 시스템의 경우 94
(3) 메타인 및 메타아웃 제어 시스템의 특성비교 96
제8장 결론 100
참고문헌 101
Abstract 112
부록(1) 시뮬레이션 프로그램 114
Table 4.1. Specification of a pneumatic cushioning cylinder 48
Table 4.2. Specifications of the experimental apparatus 48
Table 4.3. Comparison of result for different supply pressure 51
Table 4.4. Comparison of result for different external load 51
Table 4.5. Comparison of result for different supply pressure 52
Table 4.6. Comparison of result for different external pressure 52
Table 6.1. Specification of cushion sleeve length 83
Table 7.1. Comparison of data for velocity control system 88
Table 7.2. Comparison of characteristics for velocity control system 88
Fig. 2.1. Physical model of a pneumatic cushioning cylinder 20
Fig. 2.2. Equivalent vibration system for a vertically mounted pneumatic cylinder 22
Fig. 2.3. Equivalent vibration system for a horizontally mounted pneumatic cylinder 23
Fig. 2.4. Mathematical model of a double acting pneumatic cushioning cylinder 24
Fig. 2.5. Schematic diagram of the orifice 25
Fig. 2.6. Schematic diagram of a single acting pneumatic spring 27
Fig. 2.7. Schematic diagram of piston orifice model 32
Fig. 2.8. Control volume for charging process 34
Fig. 2.9. Control volume for discharging process 38
Fig. 3.1. Flowchart of computational simulation model for a vertically and horizontally mounted pneumatic cylinder 42
Fig. 3.2. Program source files for a vertically and horizontally mounted pneumatic cylinder 46
Fig. 4.1. Schematic diagram of the experiment and measurement system 49
Fig. 4.2. Comparison of computational simulation and experimental results 53
Fig. 4.3. Comparison of computational simulation and experimental results 57
Fig. 5.1. Measured thermocouple time response vs air speed with respect to the wire diameters. 62
Fig. 5.2. Crosssectional view of the cap-end side 62
Fig. 5.3. Frequency response of the thermocouple 63
Fig. 5.4. Experimental and calculated results for temperature 66
Fig. 5.5. Experimental and calculated results for temperature 67
Fig. 5.6. Experimental and calculated results for temperature 68
Fig. 5.7. Experimental and calculated results for temperature 69
Fig. 5.8. Temperature response for different supply pressure 70
Fig. 5.9. Heat Transfer rate during the charging process 72
Fig. 5.10. Heat Transfer rate during the discharging process 72
Fig. 5.11. Heat Transfer rate during the charging process of the overall temperature difference area product 73
Fig. 5.12. Heat Transfer rate during the discharging process of the overall temperature difference area product 73
Fig. 6.1. Computed results for different cushion length 75
Fig. 6.2. Computed results for different attached mass 76
Fig. 6.3. Computed results for different stroke 78
Fig. 6.4. Computed results for different cylinder in/out area 79
Fig. 6.5. Computed results for different orifice area 80
Fig. 6.6. Evaluation of a cushion performance 82
Fig. 6.7. Maximum kinetic energy of a cushioning pneumatic cylinder 83
Fig. 7.1. Photogragh of a multiple orifice cushion sleeve 85
Fig. 7.2. Velocity control system of a pneumatic cylinder 87
Fig. 7.3. Experimental results of a pneumatic cylinder with meter-in system 90
Fig. 7.4. Experimental results of a pneumatic cylinder with meter-out system 94
Fig. 7.5. Cushion pressure of different supply pressure for load mass 100㎏ 91
Fig. 7.6. Displacement of different supply pressure for load mass 100㎏ 91
Fig. 7.7. Cushion pressure of different load mass for supply pressure 6bar 92
Fig. 7.8. Displacement of different load mass for supply pressure 6bar 92
Fig. 7.9. Cushion pressure of different supply pressure for load mass 100㎏ 93
Fig. 7.10. Displacement of different supply pressure for load mass 100㎏ 93
Fig. 7.11. Cushion pressure of different load mass for supply pressure 6bar 95
Fig. 7.12. Displacement of different load mass for supply pressure 6bar 95
Fig. 7.13. Comparison of the supply pressure for different velocity control system 97
Fig. 7.14. Comparison of the displacement for different velocity control system 97
Fig. 7.15. Comparison of the velocity for different velocity control system 98
Fig. 7.16. Comparison of the acceleration for different velocity control system 98
Fig. 7.17. Comparison of the load force for different velocity control system 99
Fig. 7.18. Comparison of the cushion pressure for different velocity control system 99