In this paper, a biomimetic optimizing design of the stiffeners layout of the automotive inner door panels is proposed based on vein unit of dragonfly wing. The distributions features of the dragonfly veins and similarity as stiffeners are analyzed, and then the excellent structural features of mechanical properties of the dragonfly veins are extracted to work as a biomimetic design. In order to research the distribution of the reinforced areas in the interior door panels under various operating conditions, the finite element model is established firstly. Secondly, gray relation theory combined with analytic hierarchy analysis are imposed to determine the weight value of each condition in multi-objective topology optimization to fully consider both objective and subjective factors, and topological optimization results indicate that the stiffeners of the inner door panel are biconically designed. Finally, the original finite element results of the inner door panels are compared with that after optimized with biomimetic stiffeners under the same operating conditions, and the result of the comparison verify the effectiveness of the biomimetic topology design. Specifically, for the dent-resistant and sinking condition, the strength of new door increases by 20.2% and 14.3%, respectively. Therefore, doors with biomimetic stiffeners have an increased resistance to deformation and vibration, while the mass is reduced by 2.7%. The results can provide valuable new ideas for the optimal biomimetic design of automotive door inner panel stiffeners.

本文提出了一种基于蜻蜓翼脉单元的汽车内门板加强筋布局的仿生优化设计。分析了蜻蜓脉的分布特征和作为加强筋的相似性，提取了蜻蜓脉力学性能优良的结构特征，进行了仿生设计。为了研究不同工况下车门内板加强区域的分布情况，首先建立了有限元模型。其次，运用灰色关联理论结合层次分析法确定多目标拓扑优化中各条件的权重值，充分考虑客观因素和主观因素，拓扑优化结果表明，门内板加强筋采用双锥设计。最后，将原始内门板有限元结果与相同工况下仿生加强筋优化后的结果进行比较，比较结果验证了仿生拓扑设计的有效性。具体来说，在抗凹陷和下沉条件下，新门的强度分别增加了20.2%和14.3%。因此，带有仿生加强筋的门具有更高的抗变形和抗振能力，而质量却减少了 2.7%。研究结果可为车门内板加强筋的优化仿生设计提供有价值的新思路。将门内板的原始有限元结果与相同工况下仿生加强筋优化后的结果进行比较，比较结果验证了仿生拓扑设计的有效性。具体来说，在抗凹陷和下沉条件下，新门的强度分别增加了20.2%和14.3%。因此，带有仿生加强筋的门具有更高的抗变形和抗振能力，而质量却减少了 2.7%。研究结果可为车门内板加强筋的优化仿生设计提供有价值的新思路。将门内板的原始有限元结果与相同工况下仿生加强筋优化后的结果进行比较，比较结果验证了仿生拓扑设计的有效性。具体来说，在抗凹陷和下沉条件下，新门的强度分别增加了20.2%和14.3%。因此，带有仿生加强筋的门具有更高的抗变形和抗振能力，而质量却减少了 2.7%。研究结果可为车门内板加强筋的优化仿生设计提供有价值的新思路。比较结果验证了仿生拓扑设计的有效性。具体来说，在抗凹陷和下沉条件下，新门的强度分别增加了20.2%和14.3%。因此，带有仿生加强筋的门具有更高的抗变形和抗振能力，而质量却减少了 2.7%。研究结果可为车门内板加强筋的优化仿生设计提供有价值的新思路。比较结果验证了仿生拓扑设计的有效性。具体来说，在抗凹陷和下沉条件下，新门的强度分别增加了20.2%和14.3%。因此，带有仿生加强筋的门具有更高的抗变形和抗振能力，而质量却减少了 2.7%。研究结果可为车门内板加强筋的优化仿生设计提供有价值的新思路。