基于连续响应表面法的汽车结构耐撞性仿真优化

CRASHWORTHINESS SIMULATION DESIGN OPTIMIZATION USING SUCCESSIVE RESPONSE SURFACE METHODOLOGY

汽车结构的耐撞性及碰撞吸能优化是现代汽车工业重要的研究内容。耐撞性的优化涉及到材料与结构的众多参数,传统的设计、仿真及碰撞试验往往只能在一定程度上改善结构的碰撞性能,而无法达到限定条件下的最优状态。为解决汽车碰撞的优化问题,文中采用连续响应表面方法,通过变量筛选技术和一阶线性响应表面模型,并结合非线性有限元程序进行全局寻优。汽车前端结构的耐撞性优化表明,该方法具有较高的精度和稳定性。

In the automotive industry, structural optimization related to crashworthiness and energy absorption capability is of great importance, which involves highly nonlinear computational analysis and design with many material and structure parameters. Unfortunately, conventional design and crash test technique can only improve the structural crashworthiness to a limited extent. A new optimization approach： successive response surface method was developed to tackle the crashworthiness design problems, where the numbers of FE analyses were significantly reduced. Combined with variable screening technique and nonlinear finite element code, a linear response surface approximation was adopted to seek for optimal front rail structure with a crashworthiness criterion. The results demonstrate that the new computational design method is efficient and effective in solving crashworthiness optimization problems.