Modelling the Lateral Impact of the Thorax in Car Side Impact Accidents 856026
As part of the development of a simulation model for side impact
accidents, it has been necessary to develop a model of the human
thorax. This is required to provide both the correct dynamic
interface with the simulation of the car structure and a reasonable
criterion of injury probability. In terms of designing structures
(such as additional padding) that will maximise occupant
protection, it is important to have a good understanding of the
dependence of injury on the time history of the impact forces.
It is only possible to develop a complete model of a system as
complex as the thorax in terms of a step-by-step simulation.
However, an analytical model has also been developed to describe
the third order mass/spring/damper system that forms a major
subsystem in the step-by-step simulation. This differs from the
ordinary second order mass/spring/damper system by having an
additional spring in series with the damper, which gives a softer
response to a sudden impact. Detailed characteristics of the system
have been derived, including an analysis of the dependence of peak
deflection (probably a good measure of injury probability) on the
duration of an applied impulse force.
M. G. Langdon
Transport and Road Research Laboratory, Crowthorne, UK
International Technical Conference on Enhanced Safety of Vehicles