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An Analytical Study of Pedestrian Headform Impacts Using a Dual Asymmetrical Triangle Function

[+] Author Affiliations
Ching-Shan Cheng, J. T. Wang

GM R&D Center, Warren, MI

Paper No. IMECE2002-39706, pp. 235-248; 14 pages
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Applied Mechanics and Biomedical Technology
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Applied Mechanics Division
  • ISBN: 0-7918-3627-4 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME


Child headform and adult headform impacting the bonnet (hood) of a passenger vehicle are two of the four types of tests conducted by EuroNCAP to rate the pedestrian protection performance of new vehicles. The present work focuses on the dual-peak acceleration pulses of the headform often observed in the tests. A dual asymmetrical triangle function is chosen to model the pulse. Using the analytical function, the kinematical equations of the headform, and the explicit equations for calculating the maximum displacement, rebound time and Head Injury Criterion (HIC) value are derived. A parametric study is conducted to investigate how the wave shape affects the HIC value. Several important characteristics of the dual-peak pulses, including the headform rebound time and the maximum headform displacement, are identified. A spreadsheet tool has also been developed using the dual asymmetrical triangle function to relate the headform kinematics to the mechanical property of the bonnet.

Copyright © 2002 by ASME



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