以结构可控变形和初始接触刚度降低为目的,设计了一种民用飞机客舱地板下部吸能结构。为进一步提高结构的能量吸收效率,建立了结构的有限元模型,在正交试验设计的基础上,通过数值方法得到试验点的结构响应,利用方差分析对设计参数进行了筛选,选择显著性水平高的参数作为优化参数,并建立了响应面模型。优化结果表明：相较于不采用吸能设计的结构设计方案,优化后结构第1个刚体加速度峰值降低23.13%,第2个刚体加速度峰值降低49.86%,平均刚体加速度降低了43.71%,总体吸能时间延长了78.32%,更多的材料参加到吸能中,优化后结构的吸能效率显著提高。%By means of controlling the deformation mode and reducing the contact stiffness, a sub-floor energy absorption structure of civil airplane is designed. To improve the energy absorption features of the structure, the finite element model of the structure is built and ten design variables are chosen;based on the orthogonat experimental design, four typical structural impact responses of sample points are obtained by numerical analysis. According to Ftest, the design variables with high significance level are selected as the optimizing ones. An optimized sub-floor structure is obtained by using the response surface model. The analysis results show that, compared with the original structure, the first peak value of the structural rigid acceleration of the optimized sub-floor structure reduces by 23.13% , the second peak value reduces by 49.86% , the average value reduces by 43.71%o , the energy absorption time increases by 78.32%, more materials join in the energy absorption process, the efficiency of energy absorption of the optimized structure increases significantly.
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