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김동한(D. H. Kim),장경영(K. Y. Jhang),장석원(S. W. Chang) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
Backside defect of plate structure may grow due to fatigue or overload to cause critical failure during operation, so it is important to detect this kind of defect in line. For this purpose, nondestructive, non-contact and highly sensitive method is required, and ESPI and Shearography are considered as useful methods to satisfy these requirements. In this paper, the possibility of application of ESPI and Shearography to detect the backside defect of steel plate and to quantify the defect size was tested. For the experiment, some steel plates with a circular defect on the backside were prepared. Experimental results for these plates showed that location and size of defect could be detected correctly by both of ESPI and Shearography.
홍재희(J. H. Hong),김준영(J. Y. Kim),허건수(K. S. Huh),장경영(K. Y. Jhang),오재응(J. E. Oh) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.6
In this study, a simulation tool is developed in order to investigate non steady-state cornering performance of 6WD/6WS special-purpose vehicles. 6WD vehicles are believed to have good per-formance on off-the-road maneuvering and to have fail-safe capabilities. But the cornering perfor-mances of 6WS vehicles are not well understood in the related literature. In this paper, 6WD/6WS vehicles are modeled as a 18 DOF system which includes non-linear vehicle dynamics, tire models, and kinematic effects. Then the vehicle model is constructed into a simulation tool using the MATLAB/SIMULINK so that input/output and vehicle parameters can be changed easily with the modulated approach. Cornering performance of the 6WS vehicle is analyzed for brake steering and pivoting, respectively. Simulation results show that cornering performance depends on the middle-wheel steering as well as front/rear wheel steering. In addition, a new 6WS control law is proposed in order to minimize the sideslip angle. Lane change simulation results demonstrate the advantage of 6WS vehicles with the proposed control law.<br/>