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가속노화에 따른 BKNO<sub>3</sub>의 아레니우스 동역학 상수 분석
장승교,김준형,류병태,황정민,Jang, Seung-gyo,Kim, Jun-hyung,Ryu, Byung-tae,Hwang, Jung-min 한국추진공학회 2016 한국추진공학회지 Vol.20 No.4
Arrhenius kinetic constants, the activation energy and the pre-exponential factor, of energetic material $BKNO_3$ are estimated using Differential Scanning Calorimetry (DSC). Different from the conventional way, the activation energy was estimated more precisely through DSC aging trial, and the consumed fraction by heat was calculated by comparing the integration of heat flow. We suggested the condition of accelerated aging test for the energetic material $BKNO_3$ and reconsidered the meaning of the thermal accelerated aging.
Performance Modeling of a Pyrotechnically Actuated Pin Puller
장승교,이효남,오종윤 한국항공우주학회 2014 International Journal of Aeronautical and Space Sc Vol.15 No.1
An analytical model was developed to understand the physics and predict the functional performance of a pin puller. The formulated model is based on one-dimensional gas dynamics for an ideal gas. Resistive forces against pin shaft movement were measured in quasi-static mechanical tests, the results of which were incorporated into the model. The expansion chamber pressure and the pin shaft displacement were measured from an actual firing test and compared to the model prediction. The gas generation rate was adjusted by a correction factor, and the heat transfer rate was obtained through parametric analysis. The validity of the model is assessed for additional firing tests with different amounts of pyrotechnic charge. This model can provide knowledge on how the pin puller functions, and on which design parameters contribute the most to the actuation of the pin puller. Using this model, we estimate the functional safety factor by comparing the energy generated by the pyrotechnic charge to the energy required to accomplish the function.
장승교,김재일,류병태 한국항공우주학회 2012 한국항공우주학회 학술발표회 논문집 Vol.2012 No.11
점화제 양에 따른 고체 추진기관의 점화 지연시간을 알아보기 위하여 마이크로 모타를 이용하여 연소시험을 수행하였다. 마이크로 모타 연소 초기 압력 곡선과 비활성 모타 시험 결과를 비교하여 점화 지연시간을 추정한 결과 점화제 양이 증가할수록 점화 지연시간이 짧아짐을 확인하였다. 또한 열속과 관계된 점화 지연시간을 열 점화 이론을 통해서 얻은 계산 결과와 비교하여 큰 차이가 나타남을 확인하였는데 이는 점화기에서 공급되는 열량이 모두 효과적으로 추진제에 전달되지 않기 때문이거나, 연소실의 압력이 대기압보다 높은 경우 열 점화 이론이 적합하지 않기 때문인 것으로 판단된다. Micro motor burning tests were conducted to estimate the dependancy of ignition delay time on the amount of ignition compound used for the solid rocket motor. According to comparison the ignition transient of the micro motor to the inert motor test result the ignition delay time was estimated and it shows contraction as the amount of the ignition compound increases. Heat flux related ignition delay time differs from the calculation result based on thermal ignition theory. It is presumed that the heat flux generated from the igniter is not conducted effectively to the surface of the propellant or the thermal ignition theory is not applicable in which the combustion chamber pressure is higher than that of atmosphere.
장승교(Seung-gyo Jang),차홍석(Hong-seok Cha),강원규(Won-kyu Kang) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.5
CH-6를 이용한 격벽 착화모듈을 설계하였다. 격벽 착화모듈은 도우너 화약에 의해 발생한 충격파가 격벽을 통해 도우너 화약에 전달되었을 때 동작한다. 격벽 착화모듈의 구조적 안전성은 구조해석을 통해 확인하였고 점화 성능은 10cc 밀폐용기 시험을 통하여 검증하였다. 동작시험 결과를 토대로 통계적 처리방법인 Probit Method를 이용하여 신뢰도 분석을 하였다. 신뢰도 분석 결과를 통하여 격벽 착화모듈의 중요한 설계변수인 격벽두께를 결정하였다. A Through-Bulkhead Initiation Module(TBIM) using CH-6 was designed. The TBIM works as the shock-wave generated by a donor charge transmits to the acceptor charge. The structural safety of TBIM housing was calculated via modeling analysis, and the ignition characteristic was proved by 10 cc closed bomb test(CBT). The reliability analysis was made using Probit method on the basis of CBT results. The optimal bulkhead thickness of TBIM which is the most important design parameter was determined using reliability analysis.
장승교(Seunggyo Jang),차홍석(Hongseok Cha) 한국추진공학회 2008 한국추진공학회 학술대회논문집 Vol.2008 No.11
오링을 사용하지 않고 기밀을 유지할 수 있는 점화안전장치용 격벽 착화모듈을 설계하였다. 격벽 착화모듈은 도우너 화약에 의해 발생한 충격파가 격벽을 통해 억셉터 화약에 전달되었을 때 동작한다. 격벽 착화모듈의 구조적 안전성을 구조해석을 통해 확인하였고 점화 성능은 10cc 밀폐용기 시험을 통하여 검증하였다. 동작시험 결과를 토대로 통계적 처리방법인 Probit Method를 이용하여 신뢰도 분석을 하였다. 신뢰도 분석 결과를 통하여 격벽 착화모듈의 중요한 설계변수인 격벽두께를 결정하였다. A Through Bulkhead Initiation Module(TBIM) has been designed which guarantees the seal property without using O-ring. The TBIM works as the shock wave generated by a donor charge transmits to the acceptor charge. The structural safety of TBIM housing has been calculated via modeling analysis, and the ignition performance has been proved by 10 cc closed bomb test. The reliability analysis has been made using Probit method on the base of performance test results. According to the reliability analysis the bulkhead thickness of TBIM which is the most important design parameter has been determined.
장승교(Seung-gyo Jang),김준형(Joon-hyung Kim),류병태(Byung-tae Ryu),황정민(Jungmin Hwang) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11
시차 주사 열량계를 이용하여 BKNO₃ 화약의 아레니우스(Arrhenius) 동역학 상수인 활성화 에너지와 Pre-Exponential Factor를 구하였다. 기존의 방법과 달리 고온 가속 노화와 DSC를 병행하여 보다 정밀한 활성화 에너지를 구하였고 열 유속의 적분값을 비교하여 저장 온도에 따른 분율을 구하였다. 이를 통하여 수명 예측을 위한 BKNO₃ 화약의 가속노화 시험 조건을 제시하고 열 가속노화에 관한 의미를 재고하였다. Arrhenius kinetic constants, the activation energy and the pre-exponential factor, of energetic material BKNO3 are estimated using Differential Scanning Calorimetry(DSC). Different from the conventional way, the activation energy was estimated more precisely through DSC aging trial, and the consumed fraction by heat was calculated by comparing the integration of heat flow. We suggested the condition of accelerated aging test for the energetic material BKNO₃ and reconsidered the meaning of the thermal accelerated aging.
장승교(Seunggyo Jang),이상헌(Sanghun Lee),장현기(Hyunkee Chang) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.11
MEMS를 적용한 추진기관용 점화안전장치를 설계하고 제작하였다. MEMS는 일반적인 기계요소 설계 방식을 따라 설계하였다. 제작된 시료에 대한 검사 결과와 설계 데이터를 비교해 본 결과 스프링의 비선형 요소에 의한 영향과 가공오차 등으로 인하여 설계된 성능 값과 근사한 차이를 나타냈다. MEMS가 결합된 점화안전장치의 성능 시험을 실시함으로써 MEMS 적용 가능성을 입증하였다. Ignition Safe-Arm-Unit using micro-electromechanical systems(MEMS) for propulsion system was designed and manufactured. MEMS was designed according to the design schemes for conventional mechanical elements. By comparing the design results and the test data of the prototype, small discrepancy was found, which is due to the nonlinear characteristic of the structure and the machining accuracy. The applicability of MEMS for Safe-Arm-Unit was proved by testing MEMS which is assembled into SAU.