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채명기(M. G. Chae),정태욱(T. U. Jung),윤철호(C. H. Yun),차현록(H. R. Cha),김형모(H. M. Kim),김정철(J. C. Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
우리는 이전 논문을 통해 Air blower용 모터에서 널리 사용되고 있는 단상 유도기를 기존의 분포 권선 방식에서 벗어나 집중 권선 방식을 사용하여 설계한 결과 생산 공정의 단계를 줄이고 많은 생산 비용을 줄일 수 있었다. 또한 집중 권선형에서 발생할 수 있는 고조파 문제를 로터의 skew와 overlap 권선 방식을 이용하여 해결 할 수 있음을 증명하였다. 그러나 이러한 이점에도 불구하고 시제품의 특성을 측정한 결과 집중 권선형 모터의 자계 불균형 때문에 기존 분포권 모터에 비해 소음과 진동 특성이 좋지 않은 결과를 보였다. 이에 본 논문에서는 소음과 진동 특성을 고려하여 기존의 기동 및 정격 토크 특성을 유지하면서 토크 리플을 저감할 수 있는 방법을 로터의 Skew 각도 영향, 권선 사양 및 스테이터 및 로터 형상 등을 고려하여 새롭게 설계하였고 그 결과를 제시하였다.
안재현 ( J. H. Ahn ),김형모 ( H. M. Kim ),신명철 ( M. C. Shin ),김세원 ( S. W. Kim ) 한국분무공학회 2003 한국액체미립화학회지 Vol.8 No.4
N/A Constant volume combustion chamber has been designed to investigate diesel spray characteristics with Common-Rail injection system to realize high pressure injection. In this study, two methods of measurements, Schlieren shadowgraphy and Mie scattering imaging method are applied experimentally to study spray form and liquid phase zone in high pressure, high temperature conditions. Diesel fuel is injected at the point which ignited mixture gas is completely burned. The effect of injection pressure, injector hole diameter, ambient gas temperature and density are investigated experimentally.
신광용(K.W Shin),김형모(H.M Kim),이기용(K.Y Lee),박순섭(S.S Park),최동훈(D.H Choi) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The differential in an axle is an essential part that functions as transmitting power generated by the engine to the wheels and also balancing speed difference between the wheels when the vehicle cornering. In an absence of the differential, when one of the wheels is on the icy or muddy road, one of its shortcomings is that the vehicle looses the traction. This shortcoming is complemented by a characteristic of device, the Limited Slip Differential(LSD). Basically, the LSD restrains or locks to a certain degree the slipping of the wheels by the friction of among the components within the device as the vehicle drives on the slippery road conditions. In this research, among many types, helical gear type LSD is investigated. First, to develop the helical gear type LSD, the helix angles of gears were derived and the case that envelopes the gears was designed. Then, to test and access, the designed LSD was prototyped. The characteristics of designed part were accessed by dynamometer tests under the predefined conditions and the results were compared with that of the bench marker, wet-clutch-type LSD. Through the research, a design procedure of helical gear type LSD was proposed. The use of FEA enabled us to predict the structural safety of the part. The actual test confirmed the proposed ideas. In conclusion, the application of helical gear type LSD in a vehicle is very feasible. However, the further research to analyze the parameters that influence the functional characteristics in depth and to investigate the algorithm of the design optimization must be followed.
이기용(K. Y. Lee),김형모(H. M. Kim),박순섭(S. S. Park),박형윤(H. Y. Park) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Micro drilling is a very important machining method to produce precise parts or small molds. General macro-program for drilling is a non-efficient method because of many movements to safety height. In this research new macro-program was suggested to raise machining-efficiency. New micro-drilling method caused the much reduction of machining time and the same tool life.
이강엽(K. Y. Lee),김형모(H. M. Kim),한영민(Y. M. Han),이수용(S. Y. Lee) 한국전산유체공학회 2002 한국전산유체공학회지 Vol.7 No.3
Most of modern aerospace gas turbines must be operated at a gas temperature which is several hundreds of degrees higher than the melting temperatures of the materials used in their construction. Complicated cooling schemes need to be employed in the combustor walls and in the high pressure turbine stages. Internal passages are cast or machined into the hot sections of aero-gas turbine engines and air from the compressor is used for cooling. In many cases, the cooling system is engineered to utilize jets of high velocity air, which impinge on the internal surfaces of the components. They are categorized as 'Impinging Cooling Method' and 'Vortex Cooling Method'. Specially, research of new cooling system(Vortex Cooling Method) that overcomes inefficiency of film cooling and limitation of space. The focus of new cooling system that improves greatly cooling efficiency using less amount of cooling air on surface heat transfer elevation. Therefore, in this study, a numerical analysis has been performed for characteristics of flow and heat transfer in the swirl chamber and compared with the flow measurements by LDV. Especially, for understanding high heat transfer efficiency in the vicinity of wall, we considered flow structure, vortex mechanism and heat transfer characteristics with variation of the Reynolds number.