基于响应面法的空降车缓冲气囊参数优化研究

Research on Parameter Optimization of Airbags for Airborne Vehicle Base on Response Surface Methodology

提出了应用响应面法对空降车气囊缓冲系统的参数进行优化的方法。通过建立车体-气囊非线性有限元模型,选择缓冲气囊的排气孔面积以及排气孔开启压力作为优化变量,将车体冲击加速度峰值最小作为优化目标,采用析因设计和中心组合设计两种试验设计方法并运用最小二乘法进行二阶多项式方程的参数估计,建立二阶响应面模型。然后利用遗传算法进行优化求解。优化前后气囊缓冲特性的对比结果表明,优化后车体冲击加速度峰值减小了23.8%,气囊的缓冲性能有显著提高。

A method was described, which optimized parameters of airbags for airborne vehicle using response surface methodology. A nonlinear finite element model of hull and airbags was established. On this base, area and unsealing pressure of vent of airbags were chosen as optimization variable, while minimizing the maximal impact acceleration of hull was optimization objective. Factorial Design, Central Composite Design and least squares techniques were used to estimate the parameter of the second-order polynomial equation. Then second-order response surface model was established. After optimization process using genetic algorithm, the optimum solution was attained. The comparison result between cushion characteristics fore and after optimization shows that after optimization the maximal impact acceleration of hull is decreased by 23.8%. The cushion performance of airbags is observably improved.