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한철희(Cheolheui Han),김태완(Tae-Wan Kim),마상진(Sang-Jin Ma),신철수(Cheol-Soo Shin) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
With the development of smart materials and the micro electro mechanical systems technology, the development of flapping micro air vehicles using extremely small scale and light weight actuators and batteries is actively undergoing. In this study, the effect of the changes in the wing's geometry(aspect ratio) and kinematical parameters such as wing beating frequency and amplitude on the aerodynamic characteristics is investigated using the commercial computational fluid dynamics analysis software. The computational fluid dynamics analysis showed that the heaving wing has the increased lift and thrust with its amplitude stepping up. The cause of the drag generation is because the wing is in heave oscillation with the smaller values of the Strouhal number that the normal range for the locomotion of the creatures in nature. It is believed that present results can be utilized to the configuration design and control of the future flapping micro air vehicle.
신철수 忠州大學校 2009 한국교통대학교 논문집 Vol.44 No.-
For extended surfaces used in boiling liquids, the specified fin-base temperature may be such as to result in simultaneous nucleate, transition, and film boiling at adjacent positions on the fins. If the fins are spines of circular cross section, the optimum shape to minimize the volume of metal resembles a turnip, as shown by Haley and Westwater. The object of the new study was to develop easy-to-machine shapes using cones and cylinders. It was shown mathematically that two cons, base-to-base, give an excellent approximation to the turnip shape. Three such fins were constructed of copper and tested in Freon-113 at atmospheric pressure. The measured, peak heat duties were 5 to 70 percent higher than predicted values, proving that the design method is conservative.
LiBr-H2O 방식에 의한 흡수식 냉동기의 성능해석에 관한 연구
신철수 忠州大學校 2007 한국교통대학교 논문집 Vol.42 No.-
This paper is a study on the performance characteristics of a lithium bromide water absorption refrigeration system. The equation of the coefficient of performance is derived for a single stage cycle and the value calculated, When the evaporator temperature is at 40 ℉ and the efficiency of the liquid heat exchanger 0.75, under the assumption that the condensate in the condenser and the vapor in the evaporator are saturated. Through the calculated performance curves, the factors which influence the performance characteristics are discussed. It showed the coefficient of performance is affected by the condenser temperature and absorber temperature rather than the generator temperature, and only the water cooling systems are available when flat-plate , collectors are used as the energy source of the lithium bromide water cycle. change of Glucose.
레이저에 의한 表面 局所 加熱 時 黑體 塗料가 表面 溫度 變化에 주는 影響
金鍾喆,申澈洙,姜宇政,朴壽泉 충주대 산업과학기술연구소 1996 産業科學論文集 Vol.4 No.-
Measuring the thermophysical properties of solids in laser heating method, the material surface is coated by thin black paint layer(graphite) to minimize the effects of the laser beam reflection. But, the influence of the thin black paint layer on the surface temperature variations have been ignored. In this paper, a numerical analysis is carried out to clarify quantitatively the influence of the thin black paint layer when the material surface is heated locally. In the experiment, the material surface is heated by Ar laser beam and the surface temperature profiles are measured by an infrared thermometer.