During the last decade the simulation of the airbag deployment process has become a standard application of explicit finite element codes. At the beginning of the development the focus was to capture the influence and improve the results of dummy impact on fully inflated airbags. Later the deployment kinematics of folded airbags, different folding techniques and vent-hole design became more and more important. With the requirement to comply with FMVSS 208, i.e. Out-of-Position load cases, it became apparently necessary to include the interaction between the internal gas flow and the fabric airbag structure. Hence coupled algorithms that allow for interaction between the discretized gas flow and the airbag structure were the main focus during the past five years. The present paper aims to sketch the development history of airbag deployment simulations from the very beginning of the late 1980s to the current, highly sophisticated models available in LS-DYNA. Different modelling techniques will be shown and their advantages, drawbacks and the necessary effort to gain useful results will be discussed. The corpuscular method, switching from a AIRBAG-HYBRID input deck towards AIRBAG-PARTICLE, has proven to be a very promising new development path for airbag deployment simulations in LS-DYNA. The present examples show that the accuracy and agreement with experimental results of the new method are very good especially if complex folding in combination with wall-to-wall contact under high pressure is anticipated. If the flow needs to bend along sharp edges the new method is capable of capture the main effect with the same discretization while for ALE a much finer Eulerian mesh needs to be chosen. A significant increase of speed for similar or better results has been found. It seems that with AIRBAG-PARTICLE is a fast and accurate modelling technique for fluid-stmcture-interaction dominated problems. Further investigations on the new method to simulate vent holes, fabric porosity etc. will be done in the near future at DaimlerChrysler AG, Sindelfingen, Germany.


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    Title :

    Airbag simulation with LS-DYNA. Past - present - future


    Contributors:
    Hirth, A. (author) / Haufe, A. (author) / Olovsson, L. (author)


    Publication date :

    2007


    Size :

    24 Seiten, 22 Bilder, 9 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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