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Proposition of a new dummy head: the Bimass 150 principle
Technical Paper
1993-13-0016
Published September 08, 1993 by International Research Council on Biokinetics of Impact in Switzerland
Sector:
Language:
English
Abstract
Previous in vivo vibratory analysis of the human head showed
that the first natural frequency of the head around 150 Hz was
accompanied by a de-coupling of the cerebral mass with the skull.
The theoretical models, complemented with the epidemiological and
accidentological analysis showed that it concerned a phenomena
which was fundamental in establishing the lesion mechanism in cases
of head trauma.
The aim of this study is to transfer the biomechanical head
study results to a physical model intended for
""measuring"" the shock severity. The chosen
principle is that of two masses which model the brain and skull and
whose mechanical liaison has a rigidity such that the systems
natural frequency is at 150 Hz. The validation of the model relies
on the superimposition of the physical model's mechanical
impedance with the mechanical impedance of the human head in
vivo.
In a real shock situation, this new ""dummy
head"" enables intracranial mechanical parameters to be
recorded as a function of the shock's characteristics. In
particular it is shown how it is possible to predict the relative
brain-skull movement phenomena as a function of shock damping