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전도형(Do-Hyung Jeon),최주형(Joo-Hyung Choi),조진래(Jin-Rae Cho),김기운(Kee-Woon Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
This paper discusses the measurement of tire driving performance for 2 types of tire model. Tire is almost composed of rubber, and this is related with the bearing capacity of tire due to the external force. In this study, an explicit time integration method has been used to simulate steady state rolling along a straight path and over a cleat. And analysis for tire dynamic response rolling over a cleat is importnat to study automobile NVH properties. Besides, the evaluation of contact shear force is perfomed for steady state rolling and braking state. The results show that there are noticeable differences between 205/60R15 and 225/60R15 tire model.
전도형(Do-Hyung Jeon),최주형(Joo-Hyung Choi),조진래(Jin-Rae Cho),김기전(Gi-Jeon Kim),우종식(Jong-Shik Woo) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
This study is concerned with the braking distance estimation using frictional energy rate. First, steady state rolling analysis is performed, and using this result, the braking distance is estimated. Dynamic rolling analysis during entire braking time period is impratical, so that this study divides the vehicle velocity by 10㎞/h to reduce the analysis time. The multiplication of the slip rate and the shear stress provides the frictional energy rate. Using frictional energy rate, total braking distance is estimated. In addition. ABS(Anti-lock Brake System) is considered, and two type of slip ratios are compared. One is 15% slip ratio for the ABS condition. and the other is 100% slip ratio which leads to the almost same braking distance as the elementary kinematic theory. A slip ratio is controlled by angular velocity in ABAQUS/Explicit. A 15% slip ratio gives the real vehicle's braking distance when the frictional energy occurred at disk pad is included. Disk pad's frictional energy rate is calculated by the theoretical approach,
박근만(Keun-Man Park),조진래(Jin-Rae Cho),전도형(Do-Hyung Jeon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
A beam composed of two different materials are called bi-material beams. In case of bi-material beam analysis, it is very difficult to consider detailed material properties. Thus, we need to obtain approximately equivalent beam properties. In this paper, we derive equivalent material properties of bi-material beam for the efficient finite element eigen analysis. Through the comparison with three dimensional finite element model, the proposed numerical technique for bi-material beams is verified.