This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Finite Element Simulation of Driver Folded Air Bag Deployment
Annotation ability available
Sector:
Event:
Stapp Car Crash Conference
Language:
English
Abstract
Finite element simulation of air bags as part of the automotive occupant restraint system is rapidly evolving as a new CAE tool in support of car product development. The majority of occupant computer simulations are concentrated around the study of occupant impact into the air bag when the air bag is substantially inflated. Further, the initial air bag representation in the simulation prior to deployment is of an unfolded configuration. These simplifications do not compromise simulation of crashes wherein the dummy comes in contact with the air bag after it is substantially full. The situation wherein the dummy interacts with the air bag early during the inflation is of interest when the occupant is located close to the air bag prior to deployment. In such cases the predeploy-ment geometry of the air bag in the model needs to be representative of the actual air bag folded configuration and the unfolding of the air bag needs to be simulated. This paper includes simulations of interactions between a hemispherical solid object and an air bag under different conditions with an increasing order of complexity. Finite element simulation of the events was performed to compute the accelerations and velocities of the impacting objects and the air bag pressure. Laboratory experiments of analogous events were done independently to validate the simulation. The answers predicted by finite element simulation correlated to the experimental results with sufficient accuracy therefore, can be a useful design tool for most driver air bag crash applications.
Authors
Topic
Citation
Lakshminarayan, V. and Lasry, D., "Finite Element Simulation of Driver Folded Air Bag Deployment," SAE Technical Paper 912904, 1991, https://doi.org/10.4271/912904.Also In
References
- Wang J.T. Nefske D.J. “A New CAL-3D Air BagInflation Model” SAE Paper No. 880654 , SAE International Congress Detroit 1988
- Fitzpatrick M.V. “Development of a Driver Air Cushion (DRAC) Computerized Math Model of an EllipsoidalAir Bag Reacting in Two Dimensions on a Production TypeSteering Assembly” 8th International Conference on Experimental Safety Vehicles Wolfsburg October 1980
- deCoo P.J.A. Nieboer J.J. Wismans J. Fraterman E. “Status of MADYMO 2D Air Bag Model” SAE Paper No. 881729 , Thirty Second Stapp Car Crash Conference October 1988
- Bowman B.M. Bennet R.O. Robbins D.H. ”MVMA-2D Crash Victim Simulation” Version 4 1 Final Report UM-HSRI-79-5-1 Highway Traffic Safety Research Institute June 1979
- Chou C.C. Lev A. Lenardon D.M. ”MVMA-2D Air Bag Steering Assembly Simulation Model” SAE Paper No. 800298 , SAE Congress and Exposition Detroit February 1980
- Fleck J.T. Butler F.E. “Validation of the CrashVictim Simulator, Volume 1, Part 1 : Analytical Formulation” Report No. ZS 5881 V 1, Calspan Corporation 1981
- Nieboer J.J. Wismans J. deCoo P.J.A. “AirBag Modelling Techniques” SAE Paper No. 902322 , 34th Stapp Car Crash Conference 1990
- Brujis W.E.M. Buijk A.J. de Coo P.J.A. Sauren A.A.H. J. “Validation of Coupled Calculationswith MADYMO and PISCES Air Bag” Proceedings of the 2nd International MADYMO User's Meeting Noordwijk May 1990
- Hoffmann R. et.al “A Finite Element Approach toOccupant Simulation: The PAM-CRASH Air Bag Model” SAE Paper No. 890754 SAE International Congress 1989
- Hoffmann R. et.al “Finite Element Simulation ofOccupant Restraint System Interaction with PAMCRASH” SAE Paper No. 902325 , 34th Stapp Car Crash Conference 1990