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Projects of the
Simulation & Control Group (A. Chawla
& S. Mukherjee)
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Development of
methodology for modeling of airbags for OOP study
Japan Automobile Research Institute
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Introduction
This work aims at developing airbag simulation models to be used for
analysis in car and MC applications. In airbag deployment, the position
of the occupant has always been considered very critical. Occupants
sitting close to the airbag get severe injuries due to the large initial
impact from the airbag during its opening. This is called the out of
position (OOP) problem in automotive literature and is a very important
issue. The objective of this study has been to develop an airbag model,
which can subsequently be used in OOP studies. Simulation models with an
OOP headform has also been developed in this study.
Airbags deployment has
to meet stringent requirements, as it has to be fully deployed within 5
ms to avoid ‘slapping’ the rider. The airbag mass is
about 200 gm. and moves
at a peak speed of around 0.5m/.005s = 100m/s Energy content is about
1000 Joules ! The slap can be strong enough to break the riders jaw;
following which it has to deflate as the rider impacts the surface to
minimize the injury to the rider; so the design of an airbag is a tricky
issue. Needless to say, the driver side and passenger side airbags are of
completely different designs because of the space availability. We are
conducting simulations to evolve airbags for two wheeled vehicles.
Folding of airbags
We have developed different techniques for folding of
airbags.
1. Simulation
based folding of airbags.
2. Computational
Geometry based generation of FE mesh for folding airbags.
sample snapshots
of the airbag simulation
The result of this study has not been published
The figures below show sample snapshots of an airbag simulation without a
human headform.
We have developed airbag models for different airbags including driver
side and passenger side airbags. Some of this work has been done in
collaboration with the Japan Automobile Research Institute for which
experimental data was available for validation. For some airbags, an OOP
test and simulations have also carried out with a Hybrid III headform at
varying offsets from the airbag.
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People Involved:
Faculty involved:
1. Dr. A. Chawla
2. Dr. S. Mukherjee
3. Prof. D. Mohan
Students & Staff: Many project staff
and student has been involved in this work. Some of them are
1. Jayant Jangra
2. Manish Kushwaha
3. Prashant Bhosale
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List of Sponsored
Projects:
1. Development
of methodology for modeling of airbags.
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Related
Publication:
1.
Chawla, Bhosale P and Mukherjee S,
Meshing of folded passenger side airbag mesh, accepted for SIAT’05,held
in Pune, in January 2005.
2. Chawla
A, Mukherjee S and Snarma A, An algorithm for optimized generation of a
finite element mesh for folded airbags, International Journal of
Crashworthiness, Vol 10, No 3, 2005, pp 2459-266.
3. S.
Mukherjee, A. Chawla, J. Jangra, Issues in ALE simulation of airbags, to
appear in the International Journal of Crashworthiness??
4. Chawla
A, Mukherjee S, and Sharma A, Development of FE meshes for folded
airbags, International Journal of Crashworthiness, 2005, Vol 10, No 3, pp
259-266.
5. Chawla
A, Bhosale PV, Mukherjee S, Modeling of Passenger side Airbag mesh, SAE
Paper No 2005-26-059.
6. Chawla
A, Mukherjee S and Sharma A, Mesh Generation for folded airbags, Computer
Aided Design and Applications, Vol 1 No 1-4, P269-276, 2004.
7. Sharma
A, Chawla A, Mukherjee S, A tool for developing FE meshes for folded
airbags, Proceedings of CAD ’06 conference held in Bangkok in June 2006.
8. Mukherjee S,
Chawla A, Jangra J, Studies in Motor cycle airbags, proceedings of IRCOBI
September 2005.
9. Chawla
A, Mukherjee S and Sharma A, Mesh Generation of folded airbags, Proceedings
of the International CAD conference, May, 2004, Pattaya, Thailand
10. Chawla
A, Mukherjee S and Sharma A, A tool for developing FE meshes for folded
airbags, Proceedings of NACOMM, 2003, New Delhi India.
11. Chawla
A, Mukherjee S and Sharma A, FE mesh generation for folded cloth – an application
in airbags, proceedings of Workshop on textile ropes and cordages,
December 2003, Delhi, India.
12. Chawla
A, Mukherjee S and Sharma A, Development of FE mesh for folded airbags,
Proceedings of ChinePAM 2003, Shanghai, China.
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