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자동차의 마이크로프로셋서를 이용한 전자식 제어시스템에 대한 연구 제2편 ; 정보 표시 제어장치
채석,김용립,유준,김광락,변증남,Chae, S.,Kim, Y.L.,Liu, J.,Kim, K.R.,Bien, Zeungnam 대한전자공학회 1980 전자공학회지 Vol.17 No.6
The information display control system is designed and implemented on an automobile in which the conventional panel displays are replaced by electronic ones. The system hardware consists of three main parts, i. e., (i) the function select keyboard (ii) the central processing unit (iii) the displays, The system software consists of main routine and several interrupt service routine such as keyboaiuand display interrupt service routine:. The main routine handles various sensor inputs to generate the appropriate information for the driver such as running speed, available fuel quantity. coolant temperature, battery voltage, remaining distance to the destination , time of day, and so on. Finally the results of the field test of the system and some associated difficulties of realization problems are discussed. 자동차의 패널에 전자식 표시장치를 도입하고, 마이크로프로셋서를 사용하여 운전자에게 차의 동작상태 및 여행자료와 같은 정보를 표시하는 정보 표시시스템(information display system)을 설계 개발하였다. 본 시스템의 하드웨어로는 기능 선택 keyboard, 중앙 처리장치 표시공(displays)등이 있으며, 소프트웨어로는 여러 가지 감지기(Sensors)의 입력으로 부터, 주행속도, 사용 가능한 연료량, 냉긱수 은도, 바테리전압, 목적지까지 남은 거리, 현재의 시긱등 12가지의 여행자료등 운전자가 원하는 정보로 바꾸어 주는 main routine을 비롯하여, keyboard 및 연splay를 위한 interrupt service routine으로 구성하였다. 마지막으로, 본 시스템을 실제로 실장시험한 결과와 문제점을 논의하였다.
Surface flow control by leading-edge tubercles on a paraglider canopy
J. Shin(신정한),S. Chae(채석봉),Y. Shin(신이수),S. Hwang(황성윤),J. Park(박정목),G. S. Song(송진석),J. Kim(김주하) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Since paragliders repeat ascending and descending flights, it is essential to improve the aerodynamic performance of a canopy (i.e., a wing of paraglider) over a wide range of angles of attack. In this study, we implement the tubercle structure on the leading edge of a humpback whale flipper, which is known to delay the onset of stall, to the canopy model dynamically similar to Boomerang 11 (Gin Gliders) for controlling the flow over the model. The surface flow on the canopy model is experimentally visualized by using tuft visualization technique at Re = 3.3×10<sup>5</sup>, where Re is the Reynolds number based on the mean chord length and the free-stream velocity. For both the canopy models with and without the leading-edge tubercles, the separated region is formed around the mid-span of the model at a high angle of attack because both the local angle of attack and the local chord length decreases towards the tip of the canopy model. The separated region extends from the trailing to the leading edge on the upper (suction) surface as the angle of attack increases. The leading-edge tubercles are shown to prevent the extension of the separated region towards the leading edge, thus substantially reducing the size of the separated region formed around the mid-span section. On the other hand, it is found that the leading-edge tubercles rather induce the flow separation near the tip region. Based on the above results, a strategy to effectively control the flow over a paraglider canopy will be suggested in the presentation.
선단 돌기가 적용된 패러글라이더 캐노피의 공력성능에 대한 실험적 연구
신정한(J. Shin),채석봉(S. Chae),신이수(Y. Shin),황성윤(S. Hwang),박정목(J. Park),송진석(G. Song),김주하(J. Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The stall frequently occurs during the paraglider flight because the paraglider has wide range of angle of attacks due to repetition of ascending and descending flights. In this study, we apply the tubercle structure the leading edge of a paraglider canopy model dynamically similar to Boomerang 11 (Gin gliders). The tubercle structure is from a humpback whale flipper, which is known to delay the stall. The aerodynamic performances of the canopy with and without the leading-edge tubercles are experimentally measured by load cell at Re = 3.3×10<SUP>5</SUP>, where Re is the Reynolds number based on the mean chord length and the free-stream velocity. The leading-edge tubercles delay the stall and increase the lift coefficient on low angle of attack. Based on the above result, a role of the leading-edge tubercles will be explained with flow visualization data in the presentation.