3rd ICAI 2024

International Conference on Automotive Industry 2024

Mladá Boleslav, Czech Republic

WorldSID50 dummy is used, and the critical parameters related to the correct function of the side airbag are the shoulder force and the upper rib compression – see Fig. 2. Figure 2: Interaction between crash test dummy (a), shoulder force (b) and upper rib compression (c) (a) Interaction dummy – airbag (b) Shoulder force (c) upper rib compression

The function of the side airbag is affected by several factors, such as its shape, the gas generator power, etc. Our intention was to quantify these factors using parameters whose values would define the different design states of the airbag. The task is then to find such a combination of parameters that leads to the optimal solution, i.e. to the minimal shoulder force as well as the minimal upper rib compression. The parameters can be introduced as input variables into the PamCrash FEM solver and thus we get different levels of load on the crash test dummy for different input values. The result set obtained in this way will serve as a basis for creating a surrogate model using AI The first step was to define the parameters that can be used to control the airbag properties. The following factors have a major impact: the gas generator power, the number and size of vents, the shape of the airbag. The question was how to describe the above factors using scalar variables. The gas generator power indicates how much gas per time is released into the airbag when the airbag is deployed. This is described by a characteristic curve for each type of gas generator. We parameterized the power of the gas generator by a scaling factor which multiplies the curve. Vents are circular openings through which gas leaks when the airbag is compressed. The number and diameter of vents affects the “stiffness” of the airbag, i.e. the force acting on the dummy torso. In this case, variables can be directly used to indicate the number of vents and their number. A more complicated situation arises in the case of the airbag shape. The airbag bag is created by sewing a fabric cut, which is a 2D geometric entity. It can be described by its contour. The principle of parameterization was that the airbag contour was described by a spline curve and the control points coordinates were then the input variables (see Fig. 3). procedures, as described below. 2.1 Airbag parametrisation

95