借鉴多道次渐进成形方法，提出一种膨胀式吸能新型顶杆。保持锥形顶杆最大直径不变，在锥形顶杆区域添加定径段，将一次高膨胀率的膨胀过程变成多次低膨胀率膨胀过程。以不同膨胀角下的锥形变形区数量和定径段长度为设计变量，有限行程下的能量吸收为目标，采用全因子试验设计方法，基于移动最小二乘法建立的近似模型，进行响应面法优化设计，得到不同角度下膨胀式吸能顶杆的最佳方案。结果表明，近似模型的拟合精度较高，采用该模型的优化方案可提高膨胀式吸能管的耐撞性能。优化的临界角度为20.782°，误差小于0.313°。
Abstract
A new kind conical mandrel of the expanding energy absorption device was proposed based on multistage incremental forming. The conical part of the mandrel was divided into several sections with the largest diameter of the mandrel unchanged. In this way, the expansion process of high expansion ratio turned into several expansion processes of low expansion ratio. Considering the number of deformation zone (n) and the length of sizing section(l) as variables, full factorial design was used to take sample at different expansion angles. Based on these samples, approximation model was built with moving least squares method (MLAM). Parameters optimization using adaptive response surface method (ARSM) was carried out to gain a higher energy absorption. The results show that the approximation model has high precision, the optimization design can improve the energy absorption of expanding tube. The critical expansion angle was 20.782°, the error was less than 0.313°.
关键词
膨胀吸能 /
膨胀角度 /
响应面法 /
优化设计
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Key words
expanding energy absorption /
expansion angle /
adaptive response surface method /
optimization design
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