不同折叠形式的柱状气囊展开过程数值模拟

柱状气囊的折叠与充气展开过程复杂，采用实验手段研究其展开过程存在诸多不便。针对柱状气囊提出两种不同的折叠方式并分别建立相对应的数值分析模型，利用非线性动力学软件 LS-DYNA 研究柱状气囊折叠后充气展开的动态应用特性，对影响气囊展开过程中蒙皮应力、体积和内压曲线变化的因素进行分析，分别讨论不同折叠方式和外界环境参数对柱状气囊动态特性的影响。结果表明：两种折叠方式在收纳空间与材料强度上各有优势；此外，环境参数中的外界压强对气囊展开后的稳定状态有较大影响，而温度对气囊展开的影响相对不明显。

Simulation of the Expansion Process of Different Folded Cylindrical Airbags

The process of folding and inflating the cylindrical airbag is complicated, and there are many inconveniences in using experimental methods to study its expansion process. Two different folding methods are proposed for the cylindrical airbag and the corresponding numerical analysis models are established respectively. The nonlinear dynamics software is used to study the dynamic application characteristics of the cylindrical airbag after being folded, which will affect the skin stress during the airbag expansion process. The factors of volume and internal pressure curve change are analyzed, and the influence of different folding methods and external environmental parameters on the dynamic characteristics of the cylindrical airbag is discussed. The results show that the two folding methods have their own advantages in storage space and material strength. In addition, in the environmental parameters, the external pressure has a greater impact on the stable state of the airbag after expansion, while the temperature has no obvious effect.