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Computer Simulation of Static Deployment Tests for Airbags, Air Permeability of Uncoated Fabrics and Steady State Measurements of the Rate of Volume Flow Through Airbags
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Abstract
A computer program for the simulation of static deployment tests of airbags is introduced. The main output of the program is the pressure vs. time characteristic in the airbag. It also can be used for fine-tuning of the bag in accordance with the inflator characteristic by varying venthole area and fabric properties. This goes particularly for switching from coated to uncoated fabrics.
The mass of gas, energy, temperature, and pressure is calculated at every time using the basic gas dynamic equations, inflator characteristic, seam leakage rate, opening pressure for the cover, fabric stretch, and suction of outside air into the bag. Special attention is given to the properties of uncoated fabrics.
The air permeability of uncoated fabrics has been investigated extensively including the influence of thermal ageing. Some results of these tests are presented here in combination with steady state measurements of volume flow through airbags.
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Citation
Graefe, H., Krummheuer, W., and Siejak, V., "Computer Simulation of Static Deployment Tests for Airbags, Air Permeability of Uncoated Fabrics and Steady State Measurements of the Rate of Volume Flow Through Airbags," SAE Technical Paper 901750, 1990, https://doi.org/10.4271/901750.Also In
References
- Wang Nefske A New CAL3d Airbag Inflating Model SAE 880654 SAE International Congress Detroit 88
- Dubbels Taschenbuch für den Maschinenbau Sass F. Springer Verlag Berlin 1963
- Bohl, Willi “Technische Strömungslehre” Vogel Verlag Würzburg
- Dubbel “Taschenbuch für den Maschinenbau” Springer Verlag Berlin
- Erhardt, G. “Durchflussuntersuchungen an Drahtgeweben”