Evaluation of seat performance criteria for rear‐end impact testing BioRID II and insurance data

The BioRID is recommended for legislative rear‐end impact seat tests. Recommended injury criteria are, however, lacking; biomechanical data are limited and confines any evaluation of proposed criteria. This study aimed at addressing these limitations by comparing BioRID II data from sled tests with real‐life accident data. Results will evaluate injury predictability of the complete sled test method, which includes performance criteria, the use of a generic acceleration pulse, and the BioRID, etc. Real‐life injury risk was calculated for 17 groups of similar seat designs from data provided by Folksam. The number of insurance cases range from 150 to 1136 per group. Regression coefficients were calculated. Two types of injury risks were used: those leading to documented symptoms of more than one month’s duration and those classified as leading to permanent medical impairment as a consequence of a rear‐end impact. These risks were compared to parameter values from sled tests performed with a BioRID II at 16 km/h pulses. NIC, the maximum rearward Occipital Condyle relative T1 x‐displacements and L1 x‐acceleration best predicted the risk of developing permanent medical impairment and symptoms of more than one month, given the occupant had initial symptoms following a rear‐end impact.

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