표제지
목차
요약 10
1. 서론 12
1.1. 연구 배경 12
1.2. 국내외 연구 동향 13
1.2.1. 정밀 가스압력제어기술 13
1.2.2. 정밀 온도제어기술 15
1.3. 연구 목표 20
2. 이론적 배경 22
2.1. 압력제어식 루프 히트 파이프(PCLHP) 작동온도제어 22
3. 실험장치 구성 및 실험방법 26
3.1. 기계 구동식 가스압력제어기(MDGPC) 26
3.1.1. MDGPC 구성 26
3.1.2. MDGPC 제어방법 28
3.2. PCLHP 및 실험장치 구성 31
3.3. 실험 방법 35
3.3.1. MDGPC 최적 제어이득 결정 및 압력제어특성 평가 35
3.3.2. PCLHP 기반 압력제어식 온도제어특성 평가 38
4. 실험결과 및 토의 42
4.1. MDGPC 의 압력제어특성 42
4.2. 밀폐형 압력제어식 온도제어특성 46
4.3. 대용량 MDGPC 압력제어특성 49
4.4. 대용량 MDGPC 적용 밀폐형 압력제어식 온도제어특성 60
5. 결론 65
6. 참고문헌 68
영문 초록 74
Table 1. Design parameters of the PCLHP 34
Table 2. Control characteristics of the MDGPC to ±1 kPa step changes in set-point values at various proportional gains (KP)[이미지참조] 50
Fig. 1. Schematic of the heat pipe 16
Fig. 2. Schematic of the gas-controlled heat pipe 17
Fig. 3. Schematic of the LHP 22
Fig. 4. Thermodynamic operation curve of the LHP 23
Fig. 5. Schematic of the PCLHP 24
Fig. 6. Thermodynamic operation curve of the PCLHP 24
Fig. 7. Volume change of the variable-volume bellows chamber during expansion and compression processes 26
Fig. 8. Photograph of the MDGPC 27
Fig. 9. Block diagram of the gas pressure control process of the MDGPC with the stepped proportional control 28
Fig. 10. Block diagram of the gas pressure control process with the proportional control 29
Fig. 11. Block diagram of the gas pressure control process with the proportional integral control 30
Fig. 12. Structure and dimensions of the wick 31
Fig. 13. Structure and dimensions of the isothermal region(The section views show the internal shape.) 32
Fig. 14. Schematic of the PCLHP 33
Fig. 15. Schematic of the test setup 39
Fig. 16. Stability of the MDGPC with the proportional control 42
Fig. 17. Resolution of the MDGPC with the proportional control 43
Fig. 18. Response of the MDGPC to external pressure disturbances 44
Fig. 19. Response of the MDGPC to stepwise set-point value changes 45
Fig. 20. Change in the stability of the pneumatically-controlled temperature of the isothermal region 46
Fig. 21. Comparison of the stability characteristics between the commercial GPC and MDGPC 47
Fig. 22. Stepwise temperature control with the MDGPC 48
Fig. 23. Responses of the MDGPC with different gains to stepwise set-value changes 52
Fig. 24. Pressure stability changes inside the variable-volume chamber before and after the MDGPC operation.... 53
Fig. 25. Response of the MDGPC to increasing pressure steps 54
Fig. 26. Response of the MDGPC to external pressure disturbances with the P and PI controls 56
Fig. 27. Response of the MDGPC to stepwise set-value changes 57
Fig. 28. Comparison between the P and PI controls 59
Fig. 29. Dimensions of the dry-block comparator 60
Fig. 30. Large-scale stepwise pressure changes generated by the MDGPC 61
Fig. 31. Horizontal temperature uniformity of the working space of the isothermal region 62
Fig. 32. Vertical temperature uniformity of the working space of the isothermal region 63