Reproducibility of AHOF400 and KW400

Nusholtz, Guy; Xu, Lan; Velez, Edith Lugo; Hsu, Tim; Kochekseraii, Sadegh Babaii

Affiliations

Abstract

AHOF400 estimates the average height, from the ground, of the interacting force between a vehicle and the barrier in a rigid barrier crash test. Similarly, KW400 estimates the “stiffness” derived from the force-crush relationship corresponding to a vehicle crashing into a ridge barrier. Both metrics are calculated during the first 400 mm of crush. Although, the formulas for calculating both AHOF400 and KW400 appear simple, the reproducibility for these two measures has not been determined. One area of concern is variations in numerical methodology, signal processing algorithms and/or labs can lead to different results: numerical issues such as, determining time zero of a signal may increase lab to lab variability. In addition, AHOF400 and KW400 may not be the invariants of the system: they may be velocity dependent.

Links

URL: http://www-nrd.nhtsa.dot.gov/pdf/esv/esv21/09-0453.pdf

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