空投缓冲气囊有限元模型修正方法

Finite Element Model Updating Method of Airdrop Airbag

为了提高空投缓冲气囊有限元模拟的准确性,需要对气囊有限元模型进行修正。建立了载荷-气囊系统有限元模型,通过模型参数对气囊缓冲特性的灵敏程度分析,选择气囊与地面之间的摩擦系数和气囊排气口流量系数作为待修正参数,建立了摩擦系数、流量系数与冲击响应的响应面模型,对该响应面模型采用遗传算法进行迭代修正,求解出待修正参数的最优解。通过修正前后仿真结果与试验结果的对比验证了模型修正的有效性。

The finite element model of airdrop airbag should be updated to improve it simulation accuracy. Finite element model of payload-airbag is established. The sensitivity of the model parameters to the cushion characteristics of airbag is analyzed, and the coefficient of friction between airbag and ground and the flow coefficient of airbag are selected as the parameters to be modified. The response surface models of impact response vs. friction and flow coefficients are established. Based on the response surface models, the optimal solution is solved by genetic algorithm. The result indicates that the finite element model updating of airdrop airbag is efficient through the comparison of the simulated results before and after updating and the test results.