An Analysis of a Staged Two-Vehicle Impact

In this paper a detailed analysis of a staged two-vehicle impact is conducted. The staged impact consisted of two moving vehicles impacting in a left front corner-to-right front corner configuration. Both vehicles were outfitted with an array of triaxial accelerometers. An Anthropomorphic Test Device (ATD) was located in the driver position in one of the test vehicles. High-speed film cameras were installed on the vehicle, documenting the test dummy motion during the impact. The impact and subsequent vehicle motions were documented with offboard real-time video and high-speed film cameras. The accelerometer data from both vehicles are analyzed. This analysis demonstrates the effects of yaw motion on the determination of Delta-V and on occupant kinematics. The notion of a Principal Direction of Force (PDOF) in a yawing vehicle is also discussed. Common analytical accident reconstruction methods are applied to the post-impact information (rest positions, residual crush profiles, etc.) in an attempt to recreate the initial impact configuration. Popular accident simulation programs are also employed for the same purpose. The appropriateness and limitations of these methods are examined.