This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Gas Jet Model for Airbag Inflators
Annotation ability available
Sector:
Language:
English
Abstract
Simple, as well as more sophisticated empirical airbag models have been developed since the early seventies. By discretization of the fabric skin of the airbag in finite elements, phenomena like the inertia effects due to the motion of the different parts of the fabric, bag slap, and pressure forces on penetrating objects are accounted for, also during the deployment phase of the airbag.
In most cases relatively simple thermodynamics, i.e. a lumped parameter approach, can be used. For an out-of-position occupant however a complication can arise if the gas jet coming out of the inflator is directed towards the occupant. A relatively simple analytical model to account for the gas jet effects in combination with a lumped parameter approach is implemented in the MADYMO finite element module.
A model validation using a pendulum test with a passenger side airbag shows a good agreement between the measured and calculated results, only when the gas jet effects are included in the analysis.
Recommended Content
Technical Paper | Validation of Gasflow Airbag Simulation Methods |
Technical Paper | Transient Heating of Air Bag Fabrics: Experiment and Modeling |
Technical Paper | Ablative Radome Materials Thermal-Ablation and Erosion Modeling |
Authors
Citation
Lupker, H. and Bruijs, W., "Gas Jet Model for Airbag Inflators," SAE Technical Paper 930645, 1993, https://doi.org/10.4271/930645.Also In
References
- Prasad P. Chou C.C. A Review of Mathematical Occupant Simulation Models 95 112 Crashworthiness and Occupant Protection in Transportation Systems 106 The winter annual meeting of the Americansociety of mechanical engineers San Francisco December 1989
- Lupker H.A. et al. Advances in MADYMO Crash Simulations SAE 910879 , International Congress and Exposition Detroit February 1991
- Lupker H.A. Koppens W.P. MADYMO vehicle dynamics application 101 113 Proceedings of the 3rd International MADYMO Users’ Meeting Detroit February 1992
- Nieboer J.J. et al. Status of the MADYMO 2D Airbag Model SAE 881729 , 32nd Stapp Car Crash Conference Atlanta October 1988
- Wang J.T. Nefske D.J. A New CAL3D Airbag Inflation Model SAE 880654 , International Congress and Exposition Detroit February 1988
- van der Heijden A.M.A. et al. Numerical Simulation of Airbag Behaviour Proceedings Susi Conference Cambridge July 1989
- Nusholtz G. et al. Air Bag Inflator Gas Jet Evaluation Eighteenth Annual International Workshop on Human Subjects for Biomecha-nical Research Orlando, Florida 1990
- Lupker H.A. Helleman H.B. Fraterman E. Wismans J. The MADYMO Finite Element Airbag Model 13th International Technical Conference on Experimental Safety Vehicles, paper no. 91-S9-O-23 Paris November 1991
- Abbot M.M. van Ness H.C. Thermody namics, Schaum's Outline Series McGraw-Hill Book Company New York 1976
- van Wylen G.J. Sonntag R.E. Fundamentals of Classical Thermodynamics, SI version New York, Santa Barbara John Wiley & Sonns Inc. O-471-90229-2
- Idelchic I.E. Handbook of Hydraulic Resistance. Heidelberg etc. Springer Verlag 3-540-15462-2 Berlin 1986
- Bruijs W.E.M. et al. Airbag Simulationswith the MADYMO Fem Module SAE 920121 , International Congress and Exposition Detroit, USA February 1992
- Hirth A. Petit H.J. Bacher W. Validierung eines FE-Airbagmodells für Schlittenversuchs-Simulationen 557 578 VDI Congres Berechnung im Automobielbau Würzburg September 1992
- O'Connor C.S. Rao M.K. Development of a model of a Three-Year-Old Child Dummy used in Air Bag Applications 36th Stapp Car Crash Conference, paper no 922517 Seattle, USA 1992
- Abramovich G.N. The Theory of Turbulent Jets The M.I.T. Press Cambridge, Massachusetts 1963
- Bruijs W.E.M. Subcycling in Transient Finite Element Analysis PhD Thesis Eindhoven University of Technology 1990 90-9003684-9
- Wang J.T. Recent advances in modelling of pyrotechnic inflators for inflatable restraint systems 89 93 ASME Winter Meeting 1989