Car Automotive

Archive for December 16th, 2009

In the simple vehicle and occupant model shown in , once the free travel space or restraint slack is expended, the occupant contacts the vehicle interior surface or restraint system. To ensure that the occupant relative contact velocity is less than the initial barrier impact speed, it will be shown the free travel space should be less than the dynamic crush.  shows the relationships between the ratio of contact velocity to impact speed and the ratio of free travel to dynamic crush. Note that the same relationship exists for the ratio of contact time to time of dynamic crush.

The equations of motion for a simple vehicle!occupant model are reviewed. In a study by Huang [1] on vehicle and occupant crash dynamics, a simple model with a constant force level structure and a restraint system was used. The equations of motion for the vehicle and occupant are derived based on the vehicle equivalent square wave (ESW). These are shown as follows.