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손원희(W.H Sohn),최진환(J.H. Choi),이순걸(S.G Lee),박동창(D.C. Park),류한식(H.S. Ryu),배대성(D.S. Bae),허건수(K.S. Huh) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
An experimental study of dynamic track tension for high mobility tracked vehicle is investigated and compared to multibody dynamic simulation model. This research focuses on a heavy military tracked vehicle which has sophisticated suspension and rubber bushed track systems in computer model of the track tension. In order to obtain accurate dynamic track tension of track subsystems, each track link is modeled as a body which has six degrees of freedom. A compliant bushing element is used to connect track links. Various virtual proving ground models of Chang-Won proving ground are developed to observe dynamic changes of the track tension. The obtained empirical results of the dynamic track tension are comparcd against the simulation studies. <r.B.7]~%<>1 : Tracked Vehicle{;>~£,"j-"J), Trnck Link(;>~£"83), Dynamic Trnck Tension(%"'1 ;>~£"J-;;:j), Compliant Bushing (%<;! .!J!.>-J), DTJS("J-;;:j ~;;<.j A16 ',iJ)
하부가 가열된 케비티를 가진 사각 채널에서의 비정상 혼합대류
배대석(D. S. Bae),채용길(L. J. Cae) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
We present a numerical study of laminar unsteady mixed convection in a horizontal channel with a heat source from below of rectangular cavity. Finite volume method was employed for the discretization and PISO algorithm was used for calculating pressure term. The parameters governing the problem are the Reynolds number (10?²≤Re≤10), the Rayleigh number (0≤Ra≤10?), the aspect ratio (0.5≤A=D/H≤1) and the Pr of the high viscosity fluid 909.
배장웅(J.W.Bae),김하늘(H.N.Kim),이진욱(J.W.Lee),강건용(K.Y.Kang),류정인(J.I.Ryu) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Future exhaust gas limits for diesel-driven passenger cars will force the automotive industry to significantly improve the performance of engine. Since modern common-rail injection systems deliver more degrees of freedom referring to the injection process, again the optimization of the injection process could offer a possibility to meet the exhaust gas limits. This study describes the characteristic the pilot spray structure of piezo-driven injector for a passenger car common-rail system to be applicable multiple injection caused by fast response rather than solenoid-driven injector. The piezo-driven injector is prototype injector with same needle chamber of solenoid injector and the solenoid-driven one is commercial injector. The pilot spray characteristic such as spray tip penetration, spray speed, spray angle were obtained by spray images, which is measured by the Mie scattering method with optical system for high-speed temporal photography. It was found that piezo-driven injector effected electric change as important factor and showed faster response than solenoid-driven injector.