Experimental Analysis of Aspirating Airbag Units

Paper #:
  • 1999-01-0436

Published:
  • 1999-03-01
Citation:
Green, P., Yu, C., Butler, P., Chen, L. et al., "Experimental Analysis of Aspirating Airbag Units," SAE Technical Paper 1999-01-0436, 1999, https://doi.org/10.4271/1999-01-0436.
Pages:
6
Abstract:
Aspirating airbag modules are unique from other designs in that the gas entering the airbag is a mixture of inflator-delivered gas and ambient-temperature air entrained from the atmosphere surrounding the module. Today's sophisticated computer simulations of an airbag deployment typically require as input the mass-flow rate, chemical composition and thermal history of the gas exiting the canister and entering the airbag. While the mass-flow rate and temperature of the inflator-delivered gas can be obtained from a standard tank test, information on air entrainment into an aspirated canister is limited. The purpose of this study is to provide quantitative information about the aspirated mass-flow rate during airbag deployment. Pressure and velocity measurements are combined with high-speed photography in order to gain further insight into the relationship between the canister pressure, the rate of cabin-air entrainment and the airbag deployment. Fully instrumented, production level aspirating airbag modules serve as the principal test device.
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