There were several questions about occupant motion arising from this crash. One of the questions concerned which occupant made contact with the back of the driver’s seat.

First, a series of SIMON runs, using DyMESH, were made to analyze the vehicle kinematics. Once the vehicle motion, predicted in SIMON, reasonably matched the scene evidence, the GATB model was utilized to study occupant kinematics. With both occupants unrestrained, it was clear that they would both tend to move toward the left side of the vehicle. However the rapid rotation complicated a simplistic solution of how the occupants would behave in this crash environment. The ability of HVE to directly connect the crash pulse from SIMON to the GATB model ensured accurate vehicle motion in the occupant simulation.

Once the simulations were complete, it was determined that right-rear occupant contacted the back of the driver’s seat. There was numerous detailed data available to the analyst to study the motion trend being predicted. For example, human segment positions, velocities, and accelerations could be examined. The interaction details between the human and the vehicle interior components, such as contact location, deflection, and forces were also available to the analyst.

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