쌍발 초음속 항공기 전기체 구조시험 구속시스템 기법 연구 = A Study on Restrain System of Full-Scale Airframe Test for Twin Engine Supersonic Aircraft

다국어 초록 (Multilingual Abstract)

This paper contains study result of restraint system of full-scale airframe test for twin engine supersonic aircraft. To avoid over-restraint on x-direction when applied spring link system that was used for legacy full-scale airframe test, applying displacement-controlled restraint system using two-hydraulic cylinders with a servo valve was studied. To verify concept of displacement-controlled restraint system, simulation test using plate and hinge assembly was conducted. Before simulation, test article and fixture were designed and analyzed and quantity and specification of test equipment was determined by the result of analysis. In respect of test loading sequence and test result tolerance, test load profile and error limit that was used to legacy airframe full-scale test was applied. Reaction forces on displacement controlled hydraulic cylinders were measured by applying simulated load with respect to the x-direction. Test result satisfied design criteria of the test system mostly. But in case of applying moment, reaction force between two hydraulic cylinders were different significantly from predicted value, and this difference showed a tendency to be increased as applying load increased. To reduce difference, hydraulic cylinder type was changed by low friction sealed cylinder, and also capacity of servo valve was increased. It was shown from the simulation result that restraint system adopting spring link and hydraulic cylinder is available on full-scale airframe test for twin engine supersonic aircraft.

목차 (Table of Contents)

• Ⅰ. 서 론 1
• 1.1 연구배경 1
• 1.2 문헌조사 4
• Ⅱ. 시험 기법 8
• 2.1 유압 실린더를 활용한 쌍발 초음속 항공기 X방향 구속 시스템 기법 8
• 2.2 X 방향 구속 시스템 개념 검증 모의시험 방안 12
• 2.2.1 시험체 설계 및 유한요소 해석 13
• 2.2.2 시험 장비 선정 24
• 2.2.3 시험 수행 절차 25
• Ⅲ. 시험 결과 및 검토 32
• 3.1 X 방향 구속 시스템 기법 검증 모의시험 결과 32
• 3.1.1 LC#001 대칭하중조건 시험 결과 32
• 3.1.2 LC#002 대칭하중조건 시험 결과 34
• 3.1.3 LC#003 비대칭하중조건 시험 결과 36
• 3.1.4 LC#004 비대칭하중조건 시험 결과 38
• 3.2 X 방향 구속 시스템 개념검증 모의시험 1차 성능개선 결과 40
• 3.2.1 LC#003 비대칭하중조건 유압 실린더 교체 후 시험 결과 43
• 3.2.2 LC#004 비대칭하중조건 유압 실린더 교체 후 시험 결과 45
• 3.3 X 방향 구속 시스템 개념검증 모의시험 2차 성능개선 결과 47
• 3.3.1 LC#004 비대칭하중조건 유압 실린더 및 서보 교체 후 시험 결과 49
• Ⅳ. 결 론 52
• 참고문헌 53