• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.10
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• pp.962-968
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• 2008

An experimental study of the aerodynamic characteristics of a stealth configuration, the test techniques developed for the testing in the Low Speed Wind Tunnel of Agency for Defense Development(ADD-LSWT), and the lessons learned have been presented. The main objectives of this test are to determine the aerodynamic characteristics of a stealth configuration and to measure the flow field characteristics with a 5-hole pressure probe. The test results are discussed and the effect of the leading edge shape on the aerodynamic characteristics is also given.

• Journal of the Korea Society of Computer and Information
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• v.24 no.10
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• pp.1-9
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• 2019

Fighter pilots are taking 'Advanced Pilot Training' courses to perform their missions perfectly even under adverse conditions. However, there are accidents that fall due to problems with the human body's equilibrium in the acceleration of flight, falling into the 'Vertigo, Spatial disorientation' phenomenon. As such, accidents that fighters fall due to spatial disorientation frequently occur not only in Korea but also abroad. In this study, we implemented the 'Vertigo' warning function in the fighter. First, we analyzed the aircraft's mission computer and the currently implemented warning functions. And we studied the coordinate system to utilize the aircraft attitude information. Based on this, we wanted to provide a visual warning to the HUD when the fighter flies over a certain time in the inverted flight position. Implementing this feature is expected to improve pilot flight safety. In addition, based on the results of this study, we propose a method to implement warning functions through linkage with other subsystems.

• Aerospace Industry
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• s.88
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• pp.50-51
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• 2005

국내 첫 초음속기 T-50 양산 1호기 출고/국산 전술통제기 1호기 KO-1출고/대한항공,대파된 미 공군 HH-60G 탐색구조헬기조기 수리 납품 달성/대한항공, B717 기수동체 최종호기 납품/국산 스텔스 무인전투기 개발/토종 기상위성 첫 수출/국내 첫 우주발사체 추적소 제주에 건설

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.50 no.1
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• pp.47-57
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• 2022

UAVs have been deployed various missions such as deception, reconnaissance and attack since they have been applied in battlefield and achieved missions successfully instead of man. In the past, it is impossible for UAVs to conduct autonomous missions or cooperative mission between manned aircraft due to the limitation of the technology. However, theses missions are possible owing to the advance in communication and AI Technology. In this research, we identified the possible cooperative missions between manned and unmanned team based on air-to-air mission. We studied cooperative manned and unmanned tactics about fighter sweep mission which is the core and basic operation among various air-to-air missions. We also developed cooperative tactics of manned and unmanned team by classifying nonstealth and stealth confrontational tactics. Hereafter, we verified the validity of the suggested tactics using computer simulations.

• Journal of the Korean Society of Propulsion Engineers
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• v.17 no.2
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• pp.84-93
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• 2013

Stealthy, high maneuverability and super cruise abilities are required for the next generation fighter and unmanned aircraft. Thrust vector control technique currently come into use to meet these requirements. In this experimental study, axial and pitch thrust were measured and Schlieren visualization were carried out using the scaled two dimensional thrust vector nozzles under various pitch deflection angle, pitch flap length and height. From the study, we could get the supersonic flow characteristics and draw an optimum geometric configuration of the two dimensional thrust vector nozzle.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.46 no.4
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• pp.297-305
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• 2018

The role of UCAV is to carry out various missions in hostile situations such as penetration and attack on the enemy territory. To this end, application of RF stealth technology is indispensable so as not to be caught by enemy radar. The X-47B UCAV with blended wing body configuration is a representative aircraft in which modern RCS reduction schemes are heavily applied. In this study, a model UCAV was first designed based on the X-47B platform and then an extensive RCS analysis was conducted to the model UCAV in the high-frequency regime using the Ray Launching Geometrical Optics (RL-GO) method. In particular, the effects of configuration of UCAV considering IR reduction on RCS were investigated. Finally, the effects of RAM optimized for the air intake of the model UCAV were analyzed.

• The Optical Journal
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• s.158
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• pp.61-64
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• 2015

드론(drone)이라 불리는 무인항공기(UAV)가 무인전투기, 무인정찰기 등 군사용도를 벗어나 일상생활의 다양한 영역에서 그 쓰임새를 빠르게 찾아가고 있다. 미국 아마존과 구글, 독일 DHL, 중국 알리바바 등이 배달전용 드론을 시범 운영하고 있다. 미국 미네소타 주에 위치한 메이요(Mayo) 병원은 주변 소재 작은 병원에 수혈용 피를 운반하는데 드론을 이용하고 있다. 미국의 경우 수혈용 피 대부분이 대형 병원에 비축되어 있다. 지역의 작은 병원의 경우 1-2명의 환자를 위한 응급 피를 보관하고 있을 뿐이다. 이런 상황에서 혈액 배달 드론은 유용하게 기능할 수 있다. 그렇다고 벌떼처럼 드론이 도심을 떠다니는 일은 당분간 없을 것이다. 미국의 경우 드론사업과 관련하여 현재까지 매우 엄격한 '사전허가'가 요구된다. 그 누구도 하늘을 떠다니는 드론이 폭풍과 같은 기상 이변을 만나 자신의 머리 위로 또는 주택 위로 떨어지는 것을 원치 않기 때문이다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.46 no.1
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• pp.1-9
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• 2018

Lambda wing type Unmanned Combat Aerial Vehicle(UCAV) which adopts Blended Wing Body(BWB) has relatively less drag and more stealth performance than conventional aircraft. However, Pitching moment is rapidly increased at a specific angle of attack affected by leading edge vortex due to leading edge sweep angle. Wind tunnel testing and numerical analysis were carried out with UCAV 1303 configuration on condition of 50 m/s of flow velocity, $-4^{\circ}{\sim}28^{\circ}$ of the range of angle-of-attack. The effect of wing twist for longitudinal stability at the various angles of attack was verified in this study. When negative twist is applied on the wing, Pitch-break was onset at higher angle of attack due to delayed flow separation on outboard of the wing. On the other hand, pitch-break was onset at lower angle of attack and lift-to-drag ratio was increased when positive twist is applied on the wing.

• Aerospace Industry
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• v.81
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• pp.4-11
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• 2003

지난 5월 22일 산업자원부(미래전략산업분과위원회)가 주최하고 전자부품연구원이 ''''미래전략산업 발전전략 세미나''''에서는 21세기의 급변하는 세계 경제상황과 치열한 경쟁속에서 국가경쟁력 강화를 위한 차세대 성장동력을 발굴, 선정하여 미래 전략산업 분야의 발전비전이 제시되었다. 다음은 산업연구원 안영수 연구위원이 항공우주분야에 차세대 성장동력으로 선정된 다목적헬기, 차세대 전투기, 소형 여객기, 무인항공기, 인공위성의 5개 분야를 중심으로 발표한 항공우주산업 발전전략을 정리한다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.39 no.7
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• pp.652-659
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• 2011

A computational system to predict flowfield and infrared signature in aircraft exhaust system is developed. As the first step, a virtual mission profile is considered and an engine is selected through a performance analysis. Then a nozzle that meets the requirement of each mission is designed. The internal flow in the exhaustion nozzle at the maximum thrust is analyzed using a state-of-the-art CFD code. In addition, a system to combine information of the skin temperature distribution of the nozzle and after-body surface with an infrared prediction code is developed. Finally, qualitative results for the infrared signature reduction design are obtained by investigating the infrared signature level under various conditions.