Accuracy of AHOF400 with a moment-measuring load cell barrier.
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2011-06-13
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Abstract:Several performance measures derived from rigid
barrier crash testing have been proposed to assess
vehicle-to-vehicle crash compatibility. One such
measure, the Average Height of Force 400 (AHOF400)
[1], has been proposed to estimate the height of a
vehicle’s primary energy absorbing structures.
Previous studies have shown that the difference in
AHOF measures is a significant predictor of crash
partner fatality in vehicle to vehicle crashes.
However, the single axis 250x250 mm and
125x125 mm size of the load cells limited the
accuracy of these performance measures. The
National Highway Traffic Safety Administration
(NHTSA) recently purchased an advanced load cell
barrier using 125 x 125 mm load cells (in a 9x16 load
cell array) that measure compressive force and
moments. Simulation studies predicted this should
significantly improve the AHOF accuracy. This test
program will evaluate this prediction. Previous
studies suggest that single axis load cell measurements
may not provide sufficient accuracy. This paper will
evaluate the results using a rigid barrier that measures
vertical and lateral moments in addition to longitudinal
force. The results will be evaluated against vehicle
geometry measurements. Six crash tests were
conducted using an advanced load cell barrier with
vertical and lateral moment capability. The test
results are compared with previous single axis
125 x 125 mm rigid barrier tests. The additional
accuracy resulting from the moment data is assessed.
The benefits of the advanced load cell barrier in
terms of amplifying and enabling compatibility
criteria are discussed.
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