Development and optimization of the headrests seat according the signal Whiplash

The car seat optimization and development is very important for increasing of the safety during the car crashes. Passengers are in a permanent contact with car seat. Car seat research shows, that passenger safety depends mainly on position of a human body. Many neck bone injuries during the rear impact are caused by incorrect position between the headrest and head. It is possible to optimize the headrest position and mechanical properties like different shapes, stiffness, etc. in virtual FEM simulation. Initial and boundary conditions are used as in real EURONCAP Whiplash test. The criterion for safety prescribes HIC factor. Input material behaviors of used materials are analyzed from real measurement of specimens by using experimental test equipments. Results from simulations are important for car seat producers during seat development. Real crash tests are very expensive and will be only for confirmation of simulations.