Abstract: Objective Using computer simulation to analyze the effects of speed,type of automobile and impacted position on crash-course and injuries of pedestrians in automobile vs.pedestrian accidents.Methods Automobiles(bus,minibus,car and truck) and pedestrian models were constructed with multi-body dynamics computing method.The crashes were simulated at different impact speeds(20,30,40,50 and 60 km/h) and different positions(front,lateral and rear of pedestrians).Crash-courses and their biomechanical responses were studied.Results If the type of automobile and impact position were the same,the crash-courses were similar(impact speed ≤60 km/h).There were some characteristics in the head acceleration,upper neck axial force and leg axial force.Conclusion Multi-body dynamics computer simulation of crash can be applied to analyze crash-course and injuries(head,neck and leg) of pedestrians.

Key words: biomechanics, accidents, traffic, pedestrian, vehicle, crash, injury