中文摘要：

为给仿真车-人碰撞事故提供可靠的事故车辆车速近似值，基于经典力学理论及若干假设，推导出行人第一落地点抛距与事故车辆车速的关系，并据此获得了两个有价值的预估事故车辆最小车速模型：其一用于平坦路面，其二则用于有坡度路面．然后借助已有研究成果及Pc-Crash仿真试验数据，对所得模型进行了验证，结果表明，所得模型有效、可行．最后，通过给出的一例真实车-人碰撞事故案例，演示并进一步验证了所得模型．

英文摘要：

In order to provide a reliable approximate vehicle velocityd for simulating a vehicle-pedestrian accident, the relationship between the flight-phase distance of pedestrian and the vehicle velocity is derived, based on the classical mechanics and some hypotheses. Then, two useful prediction models of minimal vehicle velocity are ob- tained, and one of them is used for a flat road while the other is used for a slope. Moreover, the two models are ver- ified by comparing the existing researches with the simulation results obtained through Pc-Crash. It is found that the two models are effective and feasible. Finally, the two models are further verified by a real vehicle-pedestrian acci- dent.