汽车安全气囊展开过程的仿真算法

对气袋织物的各向异性材料模型进行研究,将织物的拉伸和剪切仿真与试验结果对比,以验证材料模型的准确性.分别采用控制体积法(Control Volume,CV)与近年来新开发的粒子法(Corpuscular Method,CPM),对平铺与折叠气囊展开进行数值模拟,并对比气囊展开形态和压力结果对比.结果表明,CV方法只适用于IP(In-Position)乘员与气囊作用的仿真模拟,而CPM方法可模拟出气囊展开初期的高速气流运动,且计算效率较高,适用于OOP(Out-of-Position)乘员与气囊的相互作用仿真.

Simulation Methods of Automotive Airbag Deployment

The accuracy of anisotropic material model for airbag fabric is studied. The material tensile and shear simulation results are compared with experimental results to verify the validity of material model. Then the deployment of flat and folded airbag is simulated, based on CV method and recently developed CPM separately. And the simulation results are compared and discussed. It is concluded that, CV method is only suitable for simulating the airbag and IP occupant interaction, while CPM accounts for the interaction of high speed gas flow and airbag fabric in the early phase of deployment, and it can be applied to simulating the interaction of OOP occupant and airbag with high computational efficiency.