Browse Publications Technical Papers 2020-01-0979
2020-04-14

Innovative Active Head Restraint System in a Car: Safety Assessment with Virtual Human Body Model 2020-01-0979

There are many systems designed to protect passengers in modern vehicles. The aim of this article is to use numerical simulations for safety assessment of innovative head restraint system, which can protect passengers head and neck during a side impact. That is, to evaluate possible benefit of such headrest installed in a car without head airbag during side impact and it is also tested in configuration of the far side impact. The functionality of the headrest is evaluated with respect to human population variability. We use the virtual human body model Virthuman to represent an occupant. The model is scaled for pre-selected human individuals to assess population variability influence in configuration of side impact scenarios. The human model can cover large numbers of passengers of different sizes and it extends conventional virtual evaluation of the new safety designs via existing pre-defined mono-purpose side dummies and its FE models. FE model of a small car with side airbag is used to verify benefit of the innovative headrest in different side impact scenarios inspired by the pole tests performed by EuroNCAP. Transversal impacts to a pole at 29 and 32 km/h are considered under 90° and 75° angles from driver and the opposite side. The far side impact prescribed with an acceleration pulse according to EuroNCAP is also considered. The headrest system is considered in both inactive and activated state to assess its benefits. Various initial driver sizes in standard seated positions are tested. To extend the study beyond standard testing protocols, out-of-positions of occupants are also considered leading to more than 100 simulations in total. The effect of the innovative headrest system is assessed from driver injury risk point of view.

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