Abstract ▼ AI-Helper

The braking distance of vehicles is a crucial performance because it is directly related to unexpected traffic accident. According to the recent enforcement of traffic regulation, most car makers ask the tire makers to meet the preset braking distance level. However, the prediction of braking distan...

The braking distance of vehicles is a crucial performance because it is directly related to unexpected traffic accident. According to the recent enforcement of traffic regulation, most car makers ask the tire makers to meet the preset braking distance level. However, the prediction of braking distance is not simple but complex, because many driving conditions and design parameters are complicately connected. This study is concerned with braking distance estimation of tire operated with ABS(Anti-lock brake system) using frictional energy. First, steady state rolling analysis is performed, and using this result, the braking state is performed. Dynamic rolling analysis during entire braking time period is impratical, so that this study alternatively utilize the tire frictional energy rate curve versus the vehicle speed which is interploated using the discretized frictional rates computed at intervals of 10km/h. A 3-D tire model considering detailed tread blocks is uesd for the accurate simulation. Considering ABS, 15% slip ratio is introduced. A slip ratio is controlled by angular velocity in ABAQUS/Explicit. The effect of the frictional energy rate at disc pad is numerically calculated by specifying the corresponding tire angular velocity in the dynamic rolling analysis. The comparison of experiment, theory, finite element analysis results is presented.

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