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中文摘要：
提出将近似模型引入到薄壁梁的耐撞性优化设计中,并利用序列响应面优化方法对近似模型进行优化。针对基于有限元网格模型的设计变量难于参数化的问题,开发了相应的程序将薄壁梁的材料、截面尺寸及焊点布置等参数进行参数化建模。研究结果表明：优化设计改善了薄壁梁的吸能特性,使它的质量大大减轻;基于近似模型的优化算法能较大程度地提高优化效率。
英文摘要：
It is proposed to introduce approximate model method to crashworthiness optimization design of thin-wall beam,and the approximate model can be optimized by using sequential response surface method.In order to solve the parameterization design problem of finite element model,a parameterization model about material,cross-section size and spotweld of thin-wall beam is established by developing corresponding procedures.The results show that optimization design can not only improve the performance of absorbing energy of thin-wall beam,but also reduce the weight greatly;the approximate model method can greatly improve optimization efficiency.
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