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최신 전투기 사례를 통한 T-50 FFP 시스템 최적 설계 연구
남용석,김태환,정년수,Nam, Yong-seog,Kim, Tae-hwan,Jeong, Nyeon-su 항공우주시스템공학회 2010 항공우주시스템공학회지 Vol.4 No.1
The Fuel system of T-50 Advanced Trainer is equipped with two boost pump and fuel flow proportioner for feeding fuel to turbo jet engine. when an unexpected failure occurs, they can feed the fuel to turbo jet engine which fuel quantity required. fuel quantity control method is applied for minimizing the center of gravity change. and fuel quantity control method is controlled by FQMS(Fuel Quantity Measuring System) and FFP(Fuel Flow Proportioner). This paper presents life cycle extension plans of FFP hydraulic motor by design improvements of connecting and arrangement of pipe comparing with KF-16.
T-50 비행시험을 통한 환경제어계통 콘덴서 빙결방지 설계 검증
남용석,김윤희,송석봉,서동연,손원익,박성순,Nam, Yong-Seog,Kim, Yeonhi,Song, Seok-Bong,Seo, Dong-Yun,Son, Won-Ik,Park, Sung-Soon 항공우주시스템공학회 2008 항공우주시스템공학회지 Vol.2 No.3
T-50 ECS(environment control system) was designed to have freezing protection for the condenser. However during the ground and flight test, the freezing problem was occurred. This paper deals with the analysis of the freezing problem and introduces anti-freezing design using ADI(Active De-Icing) logic to solve the condenser freezing problem of T-50 ECS
IMFP 장착각도가 T-50 초음속 고도정보에 미치는 영향
남용석,김윤희,송석봉,김성준,Nam, Yong-seog,Kim, Yeon-hi,Song, Seok-bong,Kim, Seong-jun 항공우주시스템공학회 2009 항공우주시스템공학회지 Vol.3 No.1
The flight control of the T-50 advanced trainer is conducted by the digital FBW (Flight-by-Wire) control system. The system input data consist of flight conditions such as altitude, airspeed, and angle of attack. And the flight conditions of the aircraft are obtained from IMFP (Integrated Multi-Function Probe). The T-50 aircraft equip three IMFP sensors. To ensure reliability in flight condition data obtained from each IMFP sensor, the mean value of flight conditions is used as the input of the control system. In this study, the effect of an installation angle of IMFP sensors on estimation of flight altitude was investigated by flight test results in the supersonic region.
항공용 구조물의 신뢰성 향상을 위한 숏피닝 공정 최적화 연구
남용석(Yong-Seog Nam),정유인(Yoo-In Jeong),김화수(Hwa-Soo Kim) 한국신뢰성학회 2017 신뢰성응용연구 Vol.17 No.4
Purpose: There is active research that improves both reliability and fatigue life of structures which widely used in the aerospace fields of defense industry. The effects of three parameters (pressure, peening time, nozzle distance) on Almen intensity and coverage will be investigated by using the experimental and analyzed data. Methods: we employed a Box-Behnken design. Additionally, to verify the validity of the optimal condition obtained from experimental results, metallurgical analyses of the shot-peened aerospace part were conducted with respect to surface morphology, residual stress. Results: Optimal shot peening condition is determined as (distance, pressure, time) by optimizing simultaneously the two responses of intensity and coverage. At the optimal peening condition the prediction interval for Almen intensity is well within the required range. And, the validity of the condition was checked by using the real aerospace aluminum alloy plate. Conclusion: Shot peening introduces significant levels of compressive residual stress and induces improves both reliability and fatigue life of structures
T-50 운용자료 분석을 통한 주요 구성품 수명연장 방안
남용석(Yong-Seog Nam),노신백(Shin-Baek Rho),김태환(Tae-hwan Kim),송재용(Jae-yong Song),정영명(Yeon-Myeong Jeong) 제어로봇시스템학회 2011 제어로봇시스템학회 합동학술대회 논문집 Vol.1 No.1
T-50 항공기는 운용신뢰성 향상을 위해 총수명주기관리체계(TLCSM, Total Lifecycle System Management)관점에서 운용 데이터에 대한 분석을 수행하고 있으며, 이러한 자료의 획득은 기 구축된 통합군수지원체계를 이용하고 있다. 본 논문에서는 T-50 항공기 운용중 다빈도 정비품목에 대해 통합군수정보체계에서 운용하는 항공기 정비자료를 분석하여 고장간 평균비행기간(MFTBF, Mean Flight Time Between Failure) 분석을 수행하였고, 그 분석결과를 토대로 수명연장 설계개선 방안을 도출하였다.
종이 헬리콥터 실험을 통한 개발단계 성능변동의 이해와 개선
신병철 ( Byung Cheol Shin ),김시웅 ( Si Ung Kim ),정순민 ( Sun Min Jeong ),변재현 ( Jai Hyun Byun ),남용석 ( Yong Seog Nam ) 한국품질경영학회 2015 품질경영학회지 Vol.43 No.4
Purpose: In developing new products, reducing performance variation is important for competitiveness factors such as quality, cost, and delivery. This paper aims at evaluating three performance variations; measurement,performance evaluation, and manufacturing variations, and then improving product and process design, focused on paper helicopter making case study.Methods: For measurement system analysis, gage R&R (repeatability and reproducibility), linearity, stability are evaluated. Since gage R&R are not satisfactory, the measurement system is improved by adopting voice memos application of iPhone and providing standard measurement procedure. To evaluate performance variation,product deterioration and environment factor (wind speed) is considered. Since the existing design is sensitive to these noise factors, a new product design is developed, which is proven to be robust to the noise factors. Finally, manufacturing variations are evaluated with five factors which can cause variation in flight time. To reduce the impact of three significant factors, three improvement methods are applied.Results: Three performance variations are evaluated and robust paper helicopter design is presented.Conclusion: To reduce measurement and process variations, improved measurement method and paper helicopter making procedure are proposed. A new product design is also presented which is robust to deterioration and environmental variation. This paper is expected to benefit students and practitioners who want to have hands-on knowledge on new product quality improvement.