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차량의 Spin-out 영향을 고려한 UCC 시스템 성능향상을 위한 제안
정명철(Myungchul Jung),오승규(Seungkyu Oh),이종일(Joingil Lee),노지훈(Jihoon Roh),김영우(Youngwoo Kim),김형수(Hyuoungsoo Kim),김인동(Indong Kim),장진희(Jinhee Jang) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In this paper, a proposal for performance improvement of unified chassis control(UCC) system considering the spin-out effect of the vehicle has been presented. In the UCC system, ESC (Electronic Stability Control), AFS (Active Front Steering), and EAS (Electronic Air Suspension) are included. In this paper, main focus on the test is concentrated into spin-out aspect of the vehicle because spin-out of the vehicle is a main reason to occur fatal injuries like a secondary collision in the highway. NHTSA has announced that Sine with Dwell Maneuver is the basis test to pass for the NHTSA FMVSS-126 regulation and this maneuver is severe enough to produce spin-out for most vehicles without ESC. With such reason, the Sine with Dwell maneuver was selected to evaluate spin-out effect of the vehicle. Before the UCC system test, each independent system performance check has been done by benchmarking test. Base on the test results, it is proposed that control strategy of each subsystem and UCC system. The final purpose of this paper is to improve vehicle performance with overcoming each sub-system performance limit and reduce spin-out effect on the UCC vehicle.
Development of HIL Simulator for UCC System
SeungKyu Oh,Kangwon Lee,Jihoon Roh,Myungchul Jung,Youngwoo Kim,Jinhyun Ahn,Hyoungsoo Kim,Jinhee Jang 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In these days, most of all motor companies are trying to reduce development time and cost. They use a lot of ways to solve these problems. One of the solutions is a HIL (Hardware-In-the Loop) Simulator. In this paper, HIL Simulator which is consistent with GMDAT RLM (Road to Lab to Math) Strategy is proposed. And this HIL Simulator is developed to be suitable for UCC (Unified Chassis Control) system development. The important advantages of HIL Simulator are that it can be possible to substitute road tests by virtual tests and to modify the control algorithm easily. In this UCC system, AFS (Active Front Steering) system and Air Suspension system is integrated in ESC (Electronic Stability Control) system. It is revealed that UCC system which includes AFS system, ESC system and Air suspension system has quite obviously a lot of synergy among the chassis control subsystems by previous studies. To develop UCC HIL Simulator, there are several steps. There are target vehicle modeling. vehicle model verification, configuration of S/W & H/W and application. Using this HIL Simulator, it can be easily develop, evaluate and validate control algorithm and H/W performance. And subjective and objective tests can be possible using steering system and brake system H/W, additional equipments and CarSim & MATLAB/Simulink® S/W. Finally, using this HIL Simulator, it can be achieved UCC system efficiently.
Selective resolution of phonon modes in STM-IETS on clean and oxygen-adsorbed Cu(100) surfaces
Lee, Minjun,Oh, Myungchul,Jeon, Hoyeon,Yi, Sunwouk,Zoh, Inhae,Zhang, Chao,Chae, Jungseok,Kuk, Young Elsevier 2019 Surface science Vol.689 No.-
<P><B>Abstract</B></P> <P>The observation of surface phonon using scanning probe microscopy can provide important information related to local structural and electrical properties. In this study, surface phonon modes on a Cu(100) surface were measured using inelastic tunneling spectroscopy of scanning tunneling microscopy. One phonon mode was measured at 3.6 meV on a clean Cu(100) surface. On an oxygen-adsorbed Cu(100) surface, another phonon mode was measured at 13.5 meV. This phonon mode was considered to be enhanced by the symmetry created by Cu-missing rows. The spatially varying <I>d<SUP>2</SUP>I/dV<SUP>2</SUP> </I> map showed the effect of surface stress relaxation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We measured the surface phonon modes on a bare Cu(100) surface and two reconstructed oxidized Cu(100) surfaces. </LI> <LI> These measurements were performed with different selection rules owing to the structures of the surfaces and the probing tips. </LI> <LI> A geometrically sharp STM tip was an important factor for resolving many phonon mode peaks on the surface. </LI> <LI> The symmetry of the phonon modes was directly related to the STM-IETS signal strength. </LI> <LI> Broken symmetry due to surface stress relaxation can be another factor determining the STM-IETS signal. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>