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정태은(T.E. Chung),김기범(G.B. Kim),홍승준(S.J. Hong),이용래(Y.R. Lee),김창수(C.S. Kim),조용욱(Y.U. Cho) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
Occupant injuries are always possible in a rollover accidient, one of the major accidients in a bus. Thus the structure of body frame should have sufficient strength to protect passengers under<br/> accidental loads. ECE regulation No. 66 prescribes that survival space shall be preserved in the passenger compartment during and after the structure has been subjected to rollover test.<br/> <br/> Rollover test on a body section was completed according to the regulation. The coordinates of body section before and after rollover were measured, and it was checked that the structure still<br/> complied with the requirements of survival space. Direct measurement by on a bus is difficult because of its large size. Thus photogrammetry by photographing and 3 dimensional digital<br/> modeling was introduced, and the coordinates of each point were measured through this method.<br/>
정태은(T.E.Chung),변준형(J.H.Byun),안상균(S.K.Ahn),이경헌(K.H.Lee),이동찬(D.C.Lee) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
This paper examines finitie element models for studying of the frictional heating of rolling stock wheel by wheel tread braking. The Main purpose of this study is to obtain the thermal stress distribution in wheel. CFD(Compter aided Fluid Dynamic)analysis is performed to obtained reliable heat convection coefficients in wheel surface. Heat convection coefficients from CFD analysis is compared with reference data. Various thermal loading case is investigated and fluctuating heat flux is calculated by considering actual operation condition of wheel. Finite element method is adopted to ged temperature distribution and thermal stress distribution in wheel with linear analysis.<br/>
김국원,정태은,신효철,Kim, K.W.,Chung, T.E.,Shin, H.-C. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.4
The superconducting winding in rotor of a superconducting generator should be kept at extremely low temperature of 4-5 K to maintain the superconducting state. For this purpose the liquefied helium is used for the coolant and it is very important to analyze and design a cooling system making effective use of the coolant. In this paper, the typical heat exchanger of a superconducting generator with the flow passage is analyzed with regard to the thermal equilibrium. An experimental constant relevant to the flow condition in the flow passage is determined with heat exchange experiments in cryostat. Also a new heat exchanger with porous material is proposed and designed. Results of the numerical analysis for the temperature distributions for the torque tube and the coolant are reported and the efficiency of the heat exchanger is discussed from the viewpoint of amounts of coolant needed.