Abstract. The aim of this paper was to analyse the influence of airbag deployment delay upon the head of the occupant in the case of frontal collision using simulations in PC Crash and MADYMO dummy as the occupant. The study will also take into account the pretension delay of the seat-belt which is activated along with the airbag. Frontal airbags on both the passenger and the driver were analysed including the occupant kinematics during the collision. Also, to validate the simulation, a comparison was done with a real crash test. We predict that by increasing the delay of deployment, the head acceleration will increase due to the fact the head travels close to the instrument panel/steering wheel, and the force of the airbag will generate a significant acceleration upon the head. To better assess the potential injury of the occupant, the head injury criteria (HIC) will be calculated and correlated with the Abbreviated injury scale (AIS) code.
This paper presents the validation for a simplified mathematical model of a passenger-car's ABS (Anti-Lock Braking System) for a "quarter-car" planar model was considered: a wheel in rotation movement and a mass in translational movement (the vehicle mass supported by that wheel), in accordance with the continuous improvement of the ABS (anti-lock braking system) operation for the passenger cars. The mathematical model consists in the motion equations of the wheel and "quarter-car" mass and in the equations describing the behaviour of the driver, controller, hydraulic module and brake. The model was transposed in a Matlab-Simulink model, offering the possibility to simulate many times how the ABS works if the constructive parameters, road conditions or driver inputs are changed. To validate a simplified model of a passenger car ABS (Anti-Lock Braking System) for a "quarter-car" planar model were conducted experimental researches in order to determine the braking performance of a vehicle on roads / runways with different adhesion coefficients.
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