engleski

Mathematical models for determination of the values of external dynamic inertia moments of driver s hand while operating a vehicle

The characteristic movements that occur with head and neck of subjects hit from the back in traffic accidents has been simulated on volunteers (with safe loads), recorded by stereophotogrametric method, with the system Elite. 50 examinees took part in the research, and for every subject the basic antrop-measures have been determined. By application of the basic methods of mechanics, harmonic analysis, antropometry, statistics and biomechanics, the harmonic model of head and a part of the neck have been defined, thus obtaining the model of a reference human. This model was assumed to be predominantly an independent kinetic unit regardless of the fact that it actually represents a kinematic unit together with the body. The reason for this lies in the fact that in the dynamic sense the resistance to the rotation of the head on the atlas is significantly less than the overall inertia of head and neck with relation to the co-ordinate system located at the bottom edge of the cervical vertebra. It was determined that by studying the plane movement of head and neck made of translation and rotation, first the rotation of the head around the first cervical vertebra - atlas is significantly pronounced. The determined results allow comparison between mechanical values obtained by measurements on subjects whose movements of head and neck may be considered as "normal" and the movements produced by subjects with damaged cervical vertebra.

movement of head and neck; Harmonic analysis

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