Biofidelity of rear impact dummies in low speed rear-end impact:​ comparison of rigid seat and mass production car seat in human volunteers

Yamazaki, Kunio; Ono, Koshiro; Ishii, Mitsuru

Rear impact dynamic test methodologies for reducing minor neck injuries have recently been examined internationally by EEVC, GTR, NCAP (Europe, Japan), and others. In these test methodologies, the biofidelity of the dummies is of utmost importance, so this study evaluated the biofidelity of rear impact dummies (BioRID-II, RID3D and Hybrid-III) and compared the results with those of human volunteer tests.

To evaluate the biofidelity of rear impact dummies, two test series were conducted under the same conditions as with the human volunteer tests at the impact velocity of 8 km/h: the deceleration sled test and the acceleration sled test. In the deceleration sled test, a wooden rigid seat without headrest was mounted to a sled which was moved on ramped rails and collided into a damper. In the acceleration sled test, a mass-production car seat with headrest was mounted to a sled which was accelerated horizontally. In both test series, five tests were conducted for each dummy.

In the two test series, the behavior of BioRID-II was very similar to that of the volunteers. In addition, BioRID-II showed good biofidelity for the head angle with respect to T1 (the first thoracic spine), which is considered to be an important characteristic of a rear impact dummy. These results were possible due to the spine structure flexibility of BioRID-II. On the other hand, RID3D, which has flexibility in the neck, needs flexibility between the torso and the lower neck to improve its biofidelity. For Hybrid-III, the dummy showed a very different behavioral response compared to the human volunteers; its biofidelity was lower than that of the rear impact dummies.

Keywords: rear impact; biofidelity; mini sled; back impact

Year

Entry

2007

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2005

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2002

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2007

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2002