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현철봉,구남서,김재영,이호성,Hyun, Cheol-Bong,Goo, Nam-Seo,Kim, Jae-Young,Lee, Ho-Sung 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.2
In this paper, a post-analysis of cooling system for infrared(IR) window was performed based on heating experiment of IR window system. We applied the same experimental conditions to analysis, and then validated the analysis technique by comparing numerical and experimental results. For an analysis software, we used a professional heat/fluid analysis program and the numerical and experimental results were in fairly good agreement. We investigated the effect of thermal transfer between the frame and IR window and also a cooling efficiency between fluid and structure in order to determine the proper parameters for the analysis. In this study, 100 % thermal transfer between the frame and IR window and 30 % cooling efficiency between fluid and structure have been proposed, which can be used in the future conceptual design and analysis of similar IR windows.
집적형 하이브리드 구동장치의 내부 유동 분석을 위한 리드밸브 특성 연구
이수홍(Soo-Hong Lee),현철봉(Cheol-Bong Hyun),구남서(Nam Seo Goo),조진호(Jin Ho Cho),고한서(Han Seo Ko) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
A self-contained hybrid actuator is a kind of a piston-cylinder device which is operated by a micro pump. The actuator is used for an air plane, a guided weapon, a vehicle, etc. since it has high actuating power and velocity although its size is small. The actuating velocity of the self-contained hybrid actuator is influenced by the actuating frequency of the pump. reed valve, and applied voltage. in this study, the influence of the actuating frequency and the reed valve on the actuating velocity was investigated by analyzing internal flow distribution. the FSI (Fluid Structure Interacting) of the ANSYS with the turbulent model of SST was used for the numerical analysis to calculate the internal flow by the pump frequency. Also, the effect of the shape and the thickness of the reed valve was studied. The output velocity form the numerical analysis increased with the actuating frequency initially, and the velocity decreased after 250Hz by the flow loss because the working fluid velocity could not follow the accelerating of the piezo pump. Also, the U-type reed valve showed higher output velocity than the original shape did because of creation of relatively small vortex.