Nij, a function of upper neck forces and moment, plays a dominant role in the vehicle's star rating under the new NHTSA NCAP front impact program. This is mainly due to an artifact in the mapping of the Nij into the “risk” value used in the star rating, and the fact that the neck region is not weighted appropriately to reflect its real world significance relative to the other body regions in the NCAP rating. New test data also show that compared with the 50th male driver Nij, the 5th female passenger Nij is significantly more challenging to contain and therefore it is more dominant in the star rating.This paper describes the Hybrid III dummy head and neck impact response and provides a method to determine the external force acting on the head. The force and its acting point on the head are determined from head acceleration, angular acceleration, and the upper neck forces. This paper also analyzes the neck bending mechanism and the associated forces, and how the thorax rotation and translation can affect the upper neck forces. It discusses how the airbag shape and stiffness can affect the external force acting point and direction, and how the force affects the neck internal forces. The analyses have focused on the response of the 5th female dummy neck due to the aforementioned practical difficulty with its Nij. The analytical methods presented should aid in the understanding of vehicle restraint systems.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Hybrid III Head/Neck Analysis Highlighting Nij in NCAP


    Additional title:

    Sae International Journal of Passenger Cars. Mechanical Systems
    Sae Int. J. Passeng. Cars - Mech. Syst


    Contributors:
    Beaudet, Brian (author) / Nusholtz, Guy (author) / Wu, Jianping (author) / Shi, Yibing (author)

    Conference:

    SAE 2012 World Congress & Exhibition ; 2012



    Publication date :

    2012-04-16


    Size :

    16 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Hybrid III head/neck analysis highlighting Nij in NCAP

    Wu,J. / Shi,Y. / Beaudet,B. et al. | Automotive engineering | 2012


    Hybrid III Head/Neck Analysis Highlighting Nij in NCAP

    Wu, J. / Shi, Y. / Beaudet, B. et al. | British Library Conference Proceedings | 2012


    2012-01-0102 Hybrid III Head/Neck Analysis Highlighting Nij in NCAP

    Wu, J. / Shi, Y. / Beaudet, B. et al. | British Library Conference Proceedings | 2012


    NCAP verlaesst Crashkurs - Euro NCAP

    Badstuebner,J. / Euro NCAP Inst.,Bruessel,NL | Automotive engineering | 2008


    NCAP Crash

    Automotive engineering | 2003