Simulation of airbag inflation processes using a coupled fluid structure approach
Simulation of airbag inflation processes using a coupled fluid structure approach
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DOI：
10.1007/s00466-002-0341-z
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发表时间：
2002-10-01
影响因子：
4.1
通讯作者：
Nilsson, L
中科院分区：
文献类型：
--
作者：
Marklund, PO;Nilsson, L
本文探讨了安全气囊充气问题的模拟技术，采用耦合流体结构的方法。它被看作是一个初步的研究过程中发生的现象，在一个所谓的离位乘员的影响安全气囊。本文所研究的问题是一个气囊，它被设置为冲击头部模型。头部模型定位在距气囊非常短的距离处。流体采用显式有限元程序LS-DYNA中的多材料任意拉格朗日欧拉技术，流体与结构采用基于罚函数的流体-结构接触算法耦合。头部形状的加速度和速度的结果显示出良好的协议，实验获得的值。在充气过程的早期阶段，发现在气体入口和头部形状之间形成高压区。因此，入口和高压区之间的压力差对于在入口处的音速流的先验假设来说太低，这是当今工业中使用的控制体积模型中的常见要求。
This paper explores simulation techniques for airbag inflation problems using a coupled fluid structure approach. It is to be seen as an initial study on the phenomena occurring in an airbag during a so called out of position occupant impact. The problem studied in this paper is an airbag which is set to impact a head form. The head form is positioned at a very short distance from the airbag. A multi material arbitrary Lagrangian Eulerian technique in the explicit finite element code LS-DYNA is used for the fluid and it is coupled to the structure using a penalty based fluid structure contact algorithm. The results for the head form acceleration and velocity show a good agreement to experimentally obtained values. At the early stages of the inflation process a high pressure zone is found to develop between the gas inlet and the head form. Consequently the pressure difference between the inlet and the high pressure zone is too low for an a priori assumption of sonic flow at the inlet, which is a common requirement in the control volume models used in the industry today.