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이상재(S.J.Lee),김대훈(D.H.Kim),이민규(M.K.Lee),권영철(Y.C.Kweon),장근선(K.S.Chang),윤준원(J.W.Yun),정지환(J.H.Jeong) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The purpose of this study is to investigate me characteristics of the air-side heat transfer and pressure drop on the fin pattern of six types of φ 9.52 nun finned-tube heat exchangers. An air-enthalpy Calorimeter is used in this experiment. Experiments are carried out by changing velocity (from 0.7 m/s to 1.5 m/s). From results, we can see that the air-side heat transfer coefficients and the pressure drop depend upon the geometry of the heat exchanger. With increasing the inlet air velocity, the heat transfer and the pressure drop increase linearly and exponentially, respectively. At the same heat transfer area, the heat transfers in the low velocities are nearly the same and those in 1.5 m/s have the maximum 3% difference. The pressure drops have the different trend for the fin patterns.
소형선박용 Azimuth 추진장치의 Steering Support Flange의 최적설계에 관한 연구
손정대(J-D Son),이상재(S-J Lee),이광성(G-S Lee),정용길(Y-G Jung),최병근(B-G Choi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Recent, The propeller had high performance according as high performance of small ship. So, We has the development for azimuth thrusters. This Paper has structure improvement of steering support flange in azimuth thrusters. Steering support flange is very important part. because, Steering support flange supports all weight of azimuth thrusters. We has static & dynamic analysis of Steering support flange, and we discover the very safety. So, We has optimum design for the cost reduction. A first method of optimum design, We has the thickness reduce to 30㎜ from 5㎜. next method of optimum design, We added stiffener. and we has the structure & vibration analysis.
배효준,이상재,서영백,박흥식,Bae, H.J.,Lee, S.J.,Seo, Y.B.,Park, H.S. 한국기계가공학회 2002 한국기계가공학회지 Vol.1 No.1
High speed machining system have been used in industrial because it is effective to a material manufacturing with various shape. Recently the end-milling processing is needed the high-precise technique with good surface roughness and rapid time in aircraft, automobile part and molding industry. Therefore this study proposed to decide best manufacturing cutting condition for surface roughness and rapid manufacturing tune by using computer Image processing system and 3D modelling. Until the 16,000 rpm, the surface roughness is decreased rapidly, but it is not over that. The 22,000 rpm is the spindle speed with the optimum surface in the high speed end-milling. In the case of the feed rate with 2,000 mm/mm and 8,000 mm/mm, the surface roughness is better than 4,000 mm/min and 6,000 mm/min. By using the 3D modelling, it is effectively represented shape characteristics of working surface m high speed end-milling.