기계적 파단 특성을 고려한 회전익 항공기 연료차단밸브의 자체밀봉분리형 커플링 설계

국문 초록 (Abstract)

회전익 항공기 연료차단밸브용 자체밀봉분리형 커플링(self-sealing breakaway coupling)은 항공기 내부에 연료탱크-연료공급배관 및 연료공급배관-엔진 사이에 장착되어 있다. 이는 연료공급배관에 임계 점 이상의 하중을 받게 되면 양단으로 분리되면서 내부 연료 공급을 차단시켜 2차 사고발생을 예방하는 역할을 한다. 이때 커플링에 작용하는 파단하중 모드는 인장과 굽힘이며, 이로 인해 발생되는 파단을 고려한 설계 조건은 MIL-STD-1290A 규격을 적용하였다. 본 연구에서는 파단 특성을 고려한 설계 조건을 만족하는 적절한 커플링 파단핀 직경과 파단면 노치(notch) 각도에 대한 설계를 수행하였다. 이를 위해 유한요소해석과 파단 시험을 수행하여 자체밀봉분리형 커플링의 파단특성을 고찰하였다. 이를 통해 파단핀 직경 Ø2.5 ㎜, 파단면 노치 각도 7.0°~8.0°로 설계 하중을 만족하는 설계안을 제안하였다.

다국어 초록 (Multilingual Abstract)

A self-sealing breakaway coupling for a rotary-wing aircraft fuel shut-off valve is installed between the fuel tank–fuel supply pipe and fuel supply pipe-engine interfaces. This coupling separates into two parts if loading that surpasses a specific critical point is applied to the fuel supply pipe. This separation prevents secondary accidents by shutting off the fuel supply. At this time, the loading modes for coupling separation are bending and tensile. This coupling design follows the MIL-STD-1290A standard to meet design conditions considering fracture characteristics. In this study, the appropriate fracture pin diameter and fracture surface angle are obtained to satisfy design conditions considering fracture characteristics. We investigate the coupling fracture characteristics via finite element analysis and fracture surface experiments. To satisfy the loading conditions, the suggested design for the fracture pin is a 2.5 ㎜ diameter and a fracture surface angle between 7.0° and 8.0°.

목차 (Table of Contents)

• 초록
• Abstract
• 1. 서론
• 2. 회전익 항공기용 연료차단밸브
• 3. 유한요소해석
• 4. 파단 시험
• 5. 결론
• 참고문헌(References)

참고문헌 (Reference)

1 Kong, Y. S., "Structure Analysis of Key Components of Butterfly Valve for 1000A" 23 (23): 140-145, 2009

2 Kil, G. S., "Performance Test of Fuel Isolation Valve for Launch Vehicle" 975-978, 2016

3 "MIL-STD-1290A, Light Fixed and Rotary Wing Aircraft Crash Resistance"

4 Arimoto, S., "Linear Controllable Systems" 135 : 18-27, 1990

5 Lee, J. D, "Introduction of Thrust Vector Control System and Control Valve Development for Space Launch Vehicles" 613-615, 2009

6 Kim, S. J., "Fracture Strength Analysis of Self-Sealing Breakaway Valve" 359-362, 2014

7 Liwen, W., "Fault Modeling and Simulation of Aviation Engine Fuel Return Valve" 6 : 1197-1204, 2014

8 Jeong, S. H., "Development of Topology Optimization Method Considering Static Failure Theories of Ductile and Brittle Materials" 531-535, 2011

9 Lee, H. R, "Design of Solenoid Valve for FCV Cylinder Considering Airtightness Characteristic" 1-, 2017

10 Kong, G., "Design of Joint Test Device for Fuel Delivery Shut-off Valve" 744 (744): 012027-, 2020

11 Zhang, S., "Design and Research of Mechanical Gas Timing Shut-off Device" 692 (692): 042094-, 2021

12 Kil, G. S, "Design and Manufacture of Fuel Isolation Valve" 739-742, 2019

13 Dassault Systems, "CATIA V5R20 Online Documents, Dassault Systems"

14 Jang, J. S., "Analysis of Operation Characteristics of Fuel Isolation Valve" 1047-1052, 2016

15 Wi, H. -S., "An Investigation of Icing in a Liquid Petroleum Gas Liquid Phase Fuel Injector with a Shut-Off Valve" 226 (226): 659-666, 2011

16 Zhao, Y, "Abrasion of On-Off Valve Side for Fuel System" 32-34, 2012

17 ANSYS, "ANSYS Mechanical User’s Guide 18.2"

18 한원희, "A Study on the Prevention of Spill of Fuel Oils and Lubricating Oils for Sunken Ships" 해양환경안전학회 21 (21): 309-314, 2015

19 Heney, P. J., "A Perfect Couple Pneumatic Quick-Acting Couplings Provide A Fast, Convenient Way to Repeatedly Connect and Disconnect Air Lines" 57 (57): 24-37, 2004

20 Beak, N., "A Numerical Study on Thermal Analysis of Fuel Shut-off Valve" 559-564, 2011