http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이석천,성기정 한국항공우주학회 2012 한국항공우주학회 학술발표회 논문집 Vol.2012 No.11
본 연구에서는 경량항공기의 브레이크 작동기 링크의 전달효율 해석을 통하여 작동기 링크의 성능개선안을 도출하였다. 작동기-브레이크 링키지를 스프링을 포함하는 4절링크로 모델링하였으며, 운동학적 해석 및 시뮬레이션을 수행한 결과, 작동기 링크를 개선하는 것만으로 작동기의 전달효율을 극대화하여 조종력을 증가시킬 수 있음을 확인하였다. 이렇게 증대된 제동력은 항공기의 감속뿐만 아니라 비상상황 대처능력까지 발휘할 수 있을 것으로 기대된다. In this paper, some candidates improved linkage performance have been proposed through force transmittance of the brake actuator link of a light sport aircraft. The actuator to brake linkage have been modelled to four-bar-linkage including a spring on a single link as a brake master cylinder and have been analyzed and simulated kinematically. As a result, it has been verified that control force could be magnified if the actuating linkage would have been improved only to maximize force transmittance. The braking force magnified using this method will be expected to take care of emergency situation as well as deceleration of the aircraft.
3차원 조종면 변위센서 링크의 운동학적 해석을 통한 비선형 오차 영향 연구
이석천,김재은,이상종,Lee, Sug-Chon,Kim, Jae-Eun,Lee, Sang-Jong 항공우주시스템공학회 2011 항공우주시스템공학회지 Vol.5 No.1
It is very important to correctly set control surface linkage. But a lot of bad setting case has been seen in especially remote controled airplanes and middle size UAVs. In this paper, a three dimensional linkage from control surface to deflection sensor was analyzed kinematically and a position analysis was simulated using algebraic algorithm in terms of nonlinear error of deflection angle. Three correct settings of the linkage came out of this research. One is two-dimensional motion, another is link ratio of 1 and the other is that effective lever of the control surface should be perpendicular to a pushrod in their neutral position.
에일러론 링키지 해석을 통한 작동기 변위와 조종면 변위의 상관관계 규명
이석천,이상종,Lee, Sugchon,Lee, Sang-Jong 항공우주시스템공학회 2012 항공우주시스템공학회지 Vol.6 No.3
An actuator should be added to a existing control linkage to make manned aircraft to unmanned. But it is quiet difficult to synchronize actuator with control surface because non-linear error necessarily occurs when four-bar linkage acts in three dimensional motion. In addition, in point of controller design view, while a real-time model needs the control surface deflection as its input, controller needs the actuator command as its output. Hence, the relation between both should be investigated. In this paper, the mathematical relation between actuator and control surface deflection investigated by kinematic analysis of a plant aircraft. The performance margin of the selected actuator also was verified.
이석천,김응태,성기정,Lee, Sugchon,Kim, Eung Tai,Seong, Kie-Jeong 항공우주시스템공학회 2009 항공우주시스템공학회지 Vol.3 No.3
An autothrottle module for small jet aircraft Fly-By-Wire system was developed. The autothrottle was designed to be composed of DC geared motor and electro-magnetic clutch that enables smooth manual/auto switching. A controller was designed for simple position control using ON/OFF control method with a commercial motor driver. The autothrottle developed was installed in the cockpit mockup and interfaced to the flight control computer for the HILS test. The performance test proved that the throttle lever follows well the command signal from the flight control computer.
성층권 장기체공 무인기의 비행조종시스템 및 세부계통 설계방안
이석천,임재명,김일식,홍영석,명현삼 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.11
국내에서 개발되는 고고도 장기체공(High Altitude Long Endurance) 무인기의 비행조종시스템과 세부계통의 구성 내용을 소개하고 성층권 운용을 위한 설계 방안을 제시하였다. 비행조종시스템은 이중화하였으며, 세부계통은 저온 운용에 설계의 주안점을 두었다. The domestic high altitude long endurance UAV(HALE UAV) program started in December, 2013 Its flight control system and sub-system are introduced in this paper including the design characteristics for high altitude operation. Flight control system is designed under the concept of redundancy and the sub system is focused on the extremely low temperature condition for operation.
수용성 녹용 추출물이 랫드의 체성장과 생식기 발달에 미치는 영향
Xiand Shun Cui, 이석천, 곽용철, 이정주, 한 제임스본드, 조성구 충북대학교 농업과학기술연구소 2010 農業科學硏究 Vol.26 No.1
This study was conducted to investigate the effect of water soluble extracts(WSE) of differant sections of the Velvet Antler on the growth and development somatic and male reproductive organs. Ant-lers were divided into four sections of; upper, middle and base, Water soluble extracts(35g/60㎖) were prepared from each sections of the antler, and administered orally at 10 ㎖/㎏ body weight to male Spra-gue-Dawley rats once a day. Administration of antler WSE from the tip section increased rat body weight by 26.6g compared to the control after a weeks of feeding (P<0.01). Improved (P<0.01) feed efficiency was also observed from WSE administered rats compared to the control group after 3 weeks of feeding. Overall feed efficiency tend to improve with WSE administration and improved with treatment from the tip section. Relative weights of somatic and reproductive organs were not affected by the administration of WSE. however, the absolute weights of organs tends to increase with administration of WSE compared to the control. There was no significant difference in the development of tests among treatments.