ATD kinematic measures such as head resultant acceleration (Δ=14.6 g, SD=7.2, P<.001) and pelvis resultant acceleration (Δ=8.6 g, SD=6.0, P=.005) were higher on the vehicle seats compared to the bench, as were the injury metrics for head and chest injury: ΔHIC15=162.2 (SD=87.4, P=.001) and ΔChest 3 ms clip=5.5 g (SD=6.2, P=.040). However, when the tether was added to either the 3-PT or LLA attachment methods, the difference between the bench and vehicle seats was more pronounced.
Similarly, when FFCRS were affixed with 3-PT and no tether, few kinematic variable differences achieved statistical significance chest resultant acceleration was, on average, 9.1 g (SD=6.6, P=.006) higher on the vehicle seats compared to the bench, as was CRS seatback excursion (difference of 39.8 mm, SD=32.7, P=.011) and ATD knee excursion (Δ=36.4 mm, SD=12.0, P<.001). When FFCRS were secured with LLA and no tether, little difference between the vehicle seats and 213 bench was observed. Three unique make and model vehicle seats and FFCRS were tested. The sled was then exposed to a 48 km/h acceleration pulse. An FFCRS with a restrained anthropomorphic test device (ATD) was secured by 3-point belt (3-PT) or LATCH lower anchor (LLA) on the C/FMVSS 213 bench or vehicle seat, with or without a tether.
The C/FMVSS 213 bench or one of 3 second-row original equipment manufacturer vehicle seats was mounted to the deck of acceleration crash sled.
The objective of this study was to evaluate the fidelity of the C/FMVSS 213 test bench, by comparing the dynamic performance of forward-facing child restraint systems (FFCRS) mounted on the C/FMVSS 213 sled bench versus mounted on a selection of production vehicle seats.
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