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首页> 外文期刊>Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility >Simulation of an airbag deployment in out-of-position situations
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Simulation of an airbag deployment in out-of-position situations

机译：模拟错位情况下的安全气囊展开

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摘要

The commonly used 'uniform pressure method' (UP) is a well-tried method to simulate an airbag deployment in accident cases. Nevertheless, this method indicates rather heavy inadequacies at the examination of the airbag deployment in the first milliseconds. A solution is the airbag deployment calculation by using computational fluid dynamics (CFD) methods, wherein the calculated gas flow pressure may be applied 'correctly' to the airbag shell elements. This CFD simulation is integrated in LS-Dyna with the so-called Arbitrary Lagrangian Eulerian (ALE) method and in this review the result's accuracy will be discussed. According to the FMVSS 208, an OoP model will be built-on and comparisons with simulations and tests are done. Another important detail in this labour is the airbag cover examination and the tear seam modelling, as a trivial FE modelling cannot be done due to the very fine mesh. So two possible solutions for tear seam modelling are introduced and discussed. Furthermore considerations concerning the gas generator combustion will also be revealed and an analysis about the impossibility of the direct comparison between gas generator tank test and airbag deployment will be done. At least some parameters, which take effects in the simulation, are researched and evaluated, so finally an optimised simulation model can be made available for further examinations.
机译：常用的“均匀压力法”（UP）是一种久经考验的方法，用于模拟事故情况下的安全气囊展开。然而，这种方法表明在最初几毫秒内检查安全气囊展开时存在相当大的不足。一种解决方案是使用计算流体动力学 （CFD） 方法计算安全气囊展开，其中计算出的气流压力可以“正确”地施加到安全气囊壳元件上。该CFD仿真与所谓的任意拉格朗日欧拉（ALE）方法集成在LS-Dyna中，在本文中将讨论结果的准确性。根据 FMVSS 208，将构建一个 OoP 模型，并与模拟和测试进行比较。这项工作的另一个重要细节是安全气囊盖检查和撕裂缝建模，因为由于网格非常细，无法进行微不足道的有限元建模。因此，介绍并讨论了撕裂接缝建模的两种可能解决方案。此外，还将揭示有关气体发生器燃烧的考虑因素，并分析气体发生器罐测试与安全气囊展开之间的直接比较的不可能性。至少对一些在仿真中生效的参数进行研究和评估，以便最终提供优化的仿真模型以供进一步检查。

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