Optimization of energy absorption in high speed fluid-driven mechanism
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摘要: 受流体驱动高速运动的机构,受阻后突然停止将导致零件变形甚至断裂.为得到缓冲结构的最佳方案,运用正交试验法从27种设计方案中确定了9个试验样本,并通过流固耦合与非线性有限元法对其高速运动与冲击过程进行了仿真分析.在此基础上,应用改进的BP(Error Back-Propagation)网络训练得到吸能结构参数与零件应变能的非线性映射关系.通过优化,得到了最佳方案,明显提高了方案优选效率.Abstract: For a high speed moving mechanism driven by fluid, abrupt stop resulted from barriers will lead to its large deformation, even fracture. To achieve optimum structural style and parametric matching of buffer members, nine test samples were selected out of twenty-seven design styles through orthogonal experiment method in advance. Their high-speed moving and impacting process were simulated by nonlinear finite element method(FEM) considering fluid structure interaction. On the basis of the above results, a modified error back-propagation(BP) network method was applied to train these samples, and obtained the nonlinear mapping relation between parameters of tubes for energy absorption and strain energy of crucial parts. The optimum structural parameters of buffer tube were determined, at the same time, the efficiency of schemes selection was improved obviously.
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