Validation of Newtonian Reconstruction (CRASHEX) Against Simulations of RICSAC Staged Collisions

Paper #:
  • 971108

Published:
  • 1997-02-24
Citation:
Fonda, A., "Validation of Newtonian Reconstruction (CRASHEX) Against Simulations of RICSAC Staged Collisions," SAE Technical Paper 971108, 1997, https://doi.org/10.4271/971108.
Author(s):
Pages:
10
Abstract:
The accuracy of the CRASHEX version of CRASH, which uses a Newtonian rather than a Cartesian treatment of impact, is compared with that of a substantially “original” version of CRASH, both evaluated with respect to EDSMAC computer simulations of the RICSAC series of staged, partially braked collisions; and with similar data for EDCRASH, as published but recomputed.Special problems inherent in treatment of impact with a stopped vehicle, quasi-head-on impact, failure to separate after initial impact, and spin truncated by side slap are discussed.Appropriate use of the statistical confidence interval in single-event reconstruction is also discussed, as are anomalies in previously published standard deviations for EDCRASH applied to the RICSAC data.The study shows that the Cartesian simplification incurs dominantly large errors, a finding not generally recognized. For complete and accurate reconstruction, Newtonian treatment, as now provided in CRASHEX, is requisite.
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