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CONDUIT을 이용한 헬리콥터 조종성에 대한 비행제어법칙 설계 및 최적화
이장호,김응태,이석천,유혁,Lee, Jangho,Kim, Eung-Tai,Lee, Sugchon,Ryu, Hyeok 항공우주시스템공학회 2012 항공우주시스템공학회지 Vol.6 No.2
The evaluation of simulation models against ADS-33 quantitative rotorcraft handling qualities metrics has, in the past, been a time consuming effort, involving many individual analyses in both the time and frequency domains. Manual tuning of control system parameters to meet handling qualities and performance specifications has been cumbersome and complicated. Performing rigorous trade-off studies for numerous variations in the control system is too time consuming to be practicable. With the complex interaction of time- and frequency based specifications for the closed- and broken-loop responses, it is difficult to know if the design makes the most effective use of the available control power. The Control Designer's Unified Interface (CONDUIT) software makes possible rapid optimization and trade-offs of design configurations against handling qualities specifications.
이장호,강영신,배효길,이해창,Lee, Jangho,Kang, Youngsin,Bae, Hyogil,Lee, Hae-Chang 항공우주시스템공학회 2013 항공우주시스템공학회지 Vol.7 No.3
Tail wing is important to designing of civil aircrafts, because it is responsible for aircraft stability and control. Tail wing has a role in aircraft control and makes aircraft fly stably without any pilot control input. Also, designing of tail wing determine trim drag force in whole aircraft. Center of gravity(CG) of aircraft travels with various effects as placement of passenger's seats, location of cargo bay, etc. In designing horizontal tail volume, aircraft CG travel has to be considered to have margin so that it should be sized to provide adequate stability and control for the airplane's entire CG range throughout the flight envelope. Finally, it is essential to have sufficient elevator control to perform stall at forward CG for all flaps down configurations. Such stalls establish the FAR stall speed which airplane take-off and landing performance. This paper deals with the process for tail wing design regarding the aircraft CG travel and results for 95-seat type turboprop aircraft.
Stateflow를 이용한 소형제트기 Flight Director의 비행모드 구현
이장호,김성필,성기정,김웅태,Lee, Jangho,Kim, Sungpil,Sung, Kijeong,Kim, Eungtai 항공우주시스템공학회 2007 항공우주시스템공학회지 Vol.1 No.2
Flight modes of automatic flight control system for light general aviation flight deck. Garmin G1000, were realized using Stateflow. In developing aircraft, it is difficult to verify the operational flight program in particular branch statement because developer can not see any visual logical steam. So, Stateflow has been used to visualize logical stream, transition from one flight mode to another flight mode. The performance was approved by applying flight mode transition conditions of G1000 to proposed transition system that is composed of states, switches, events, data and transition conditions. DURMI-II was used as 6-DOF simulation model.
환경모니터링을 위한 집비둘기 알 껍데기의 중금속 축적특성 연구
이장호 ( Jangho Lee ),이종천 ( Jongchun Lee ),박종혁 ( Jong Hyouk Park ),이유진 ( Eugene Lee ),심규영 ( Kyuyoung Shim ),김명진 ( Myungjin Kim ),신영규 ( Youngkyu Shin ) 한국환경영향평가학회 2015 환경영향평가 Vol.24 No.6
The heavy metal accumulations of avian eggshells were studied in order to test a feral pigeon (Columba livia)`s eggshell as an indicator for the environmental monitoring of pollutants. The reviews on the eggs of the different 19 avian species showed that it is the eggshell rather than the egg content that can better reflect the heavy metals in the environment; in most cases the CVs (coefficients of variations) of the heavy metal concentrations in the eggshells were higher than those in the egg contents. This can indicate that the heavy metal accumulations are homeostatically controlled in the egg contents, but the accumulations in the eggshells are varied according to the environmental conditions. To test the reviews, the feral pigeon eggs from the two different sites, one representing urban and the other rural environment, were analyzed for lead (Pb) and cadmium (Cd). The result showed that the eggshells of the urban pigeons (Hangang) had the higher metal concentrations than those of the rural pigeons (Hampyeong). The same difference can also be found in the internal organs (liver, bone) and blood. However, the analyses of the egg contents between the two sites did not reveal the differences. In other words, the result suggests that the feral pigeons, like the other avian species, are able to control the heavy metals into the egg contents homeostatically. Therefore, it is more useful to use the feral pigeon eggshell rather than the egg content in case of monitoring heavy metals in different habitats.