This study shows a comparison of different active head restraint concepts, which guarantee a reduction of the distance between head and head rest during a rear-end collision. In addition the size of the head rest is enlarged. Different concepts were validated by sled tests using Hybrid-III Dummies equipped with the newly developed TRID-neck. Also volunteer tests were performed to prove the effectiveness of the new concepts. From these concepts, the inflatable head rest has proven to be the most efficient system. It is big enough to protect occupants up to the size of the 95th-percentile male, independently from the preadjusted position. If the head rest is positioned too low the upward increase in volume will be sufficient for occupant protection, whereas if the head rest is positioned too high the downward increase in volume will fill the gap between seat back and head rest. Thus the inflatable head rest concepts will be appropriate for almost all occupant sizes, independent from preadjusted position. The results have shown that relative motions between head and neck, as well as neck loads, were reduced significantly at all impact velocities and in all occupant positions. The inflation noise was reduced to a level that was hardly audible for the volunteers, at least when compared to the crash noise. Further sound pressure measurements in the cabine alpha showed a 99.99 % probability, that no hearing damage will occur. This report shows that the inflatable head rest is a promising new concept that can reduce Whiplash Associated Disorders (WAD) following rear-end impacts especially in low speed collisions. It allows a comfortable head rest position and is suitable for almost all occupant sizes without the need for adjustment.
A comparison study of active head restraints for neck protection in rear-end collisions
Vergleichsuntersuchung über aktive Kopfrückhaltesysteme für den Nackenschutz bei Auffahrunfällen
1998
9 Seiten, 17 Bilder, 33 Quellen
Aufsatz (Konferenz)
Englisch
A Comparison Study of Active Head Restraints for Neck Protection in Rear-End Collisions
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