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This paper describes the behavior of a driver side occupant restrained by airbag system on a passenger vehicle at a frontal barrier crash. In order to secure effective occupant protection at collisions, it is necessary to conduct close examination into the movement of steering system due to the rearward movement of dashboard as well as vehicle deformation characteristics, generally for vehicles whose crash space at engine compartment is small. The authors examine the influence of these two parameters on occupant injury indices using MADYMO 2D computer simulation program. As a result, it is found important to model the axial collapse and the rotation of steering system in the vertical plane caused by dashboard deformation, in order to achieve good correlations between experiment and simulation. It is demonstrated.

The rotational behavior of the vehicle in the vertical plane at frontal collision against a flat barrier often plays an important role with respect to an evaluation of passenger compartment integrity and occupant protection. An analytical method to examine the degree of influence of vehicle front end parameters, both on the behaviour of the vehicle and its occupant, is presented, employing a two-dimensional finite element vehicle model and a two-dimensional lumped-mass occupant model. The feasibility of the method is discussed by comparing the calculated results with the experimented ones, in relation to the behaviour of passenger compartment and its occupant injury measure.

This paper describes the rotational behavior of the vehicle in the vertical plane at frontal collision against a flat barrier. The control of the rotational behavior is important because this often has a great influence on both passenger compartment integrity and occupant protection. The authors examine the cause of this rotational behavior of the vehicle using the numerical simulation of a full scale passenger car model with an explicit finite element method. As a result, it is found that the deformation process and the transmitted force of basic framework greatly affect to the rotational behavior. The simulation explains its difference between a typical FR (front engine &, front drive) vehicle and a FR (front engine & rear drive) vehicle. The mechanism during the rotational behavior is analyzed by means of the transmitted force to subsequent frame members. The typical comparison of the simulation and the vehicle test are also presented.