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상호상관 PIV기법을 이용한 엔진 실린더내 난류의 공간적 해석
정구섭(Kuseob Chung),정용욱(Yongoug Chung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Tumble or swirl flow is used adequately to promote mixing of air and fuel in the cylinder and to enlarge turbulent intensity in the late time of compression stroke. However, since in-cylinder flow is a kind of transient state with rapid flow variation, that is, non-steady state flow, swirl or tumble flow has not been analyzed sufficiently and not been recognized whether they are available for combustion theoretically yet. In the investigation of intake turbulent characteristics using PIV method, different flow characteristics were showed according to SCV figures. SCV installed engine had higher vorticity, turbulent strength by fluctuation and turbulent kinetic energy than a baseline engine, especially around the wall and lower part of the cylinder. Consequently, as swirl flow was added to existing tumble flow, it was found that fluctuation component increased and flow energy was conserved effectively through the experiment.
비-홀로노믹(Non-holonomic) 시스템을 갖는 운반체의 동력학적 분석
정용욱(Yongoug Chung),정구섭(Kuseob Chung) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
We presents a dynamic analysis of 4-wheeled vehicle. The classic dynamic model utilizes a greatly simplified wheel motion representation and using of a simplified dynamic model confronts with a problem for accurate position control of wheeled vehicle. In this paper, we treats the dynamic model for describes relationship between the wheel actuator force/torque and vehicle motion through the use of Non-holonomic system. We can be easily extend the proposed vehicle model to mobile robot of similar type and this type of methodology is useful to analyze, design and control any kinds of rolling robots.