Abstract: The relationship between the head subjected forces of two motorcycle occupants and time was
analyzed to obtain more intuitive results in car-motorcycle side-impact, which is a common accident. Virtual
field experiments were made with PC-Crash software to simulate and analyze head subjected forces. The
simulations are grouped based on the vehicle velocity, the motorcycle velocity, the collision position, etc. Two
accident cases recorded by Shanghai United Road Traffic Safety Scientific Research Center at Tongji University
were used as data base. The force peak and the region area changing with timeline were analyzed for different
conditions. The results show that the motorcycle occupants' head injuries are related to the collision position of
the motorcycle at any kind of impact velocity and that the one who is closer to collision point is more vulnerable
to injury.

Key words: auto engineering, collision, simulation, force of the head