An Analytical Study of Side Airbag Designs for TTI Reduction in a Large Size Car 982322
In this study the side airbag design for a large car was investigated. The assessment of the airbag efficacy was based on the TTI response of the SID. In general, large size cars have low TTI values to begin with due to their higher mass, stronger structure, and more spacing between the occupant and the door. The CALOPT optimization program was used to search the design space. We found that for this particular impact environment an airbag design with a high mass flow rate and a large vent resulted in the lowest TTI for the SID. The high mass flow rate enables the airbag to contact the dummy thorax early, which causes the dummy to begin to move away from the door before contact is established with the door. The large vent is necessary to avoid excessive force from the airbag during the dummy/airbag interaction. For the two inflators considered in this study it was found that the less aggressive inflator achieved a marginal reduction of 10% from the baseline TTI response. On the other hand, the more aggressive inflator achieved a reduction of 26% from the baseline TTI response. Compared to the over 40% TTI reduction reported in our previous studies for small size cars, side airbags seem less effective in a large size car than in a small size car for the impact condition and injury criteria considered in this study. Finally, it should be pointed out that a more complete assessment of side airbag efficacy should include responses of deflection-based injury criteria for the thorax, and utilize a more biofidelic test dummy model.
Citation: Deng, Y., Wang, J., Peng, J., and Kulkarni, S., "An Analytical Study of Side Airbag Designs for TTI Reduction in a Large Size Car," SAE Technical Paper 982322, 1998, https://doi.org/10.4271/982322. Download Citation
Author(s):
Yih-Charng Deng, J. T. Wang, Julie H. Peng, Surendra Kulkarni
Affiliated:
General Motors R & D Center, General Motors Mid-Size/Luxury Div.
Pages: 8
Event:
International Body Engineering Conference & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
1998 Ibec Proceedings Volume 6: Safety, Environmental, and Automotive Interior Systems-P-335
Related Topics:
Airbag systems
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