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以圆锥形薄壁金属管为对象进行耐撞性优化研究,并对几种全局近似函数构造模型精度与适用性进行讨论。以薄壁管的多个几何参数为设计变量,以质量比吸能、长度比吸能、最大冲击载荷为目标函数,通过对比几种不同方法构造的近似模型精度,发现依据各个目标函数的非线性强弱程度不同,可以采用相对应的构造方法获得精度最高的近似模型。最后结合普适性最好的RBF法对圆椎管进行多目标的耐撞性优化,并给出设计空间中的Pareto解集与Pareto曲面,提供了多种侧重不同耐撞性指标优化的设计方案。
The research on the optimization of the crashworthiness of conical thin-walled metal tubes is carried out. The accuracy and applicability of several global approximation functions are discussed. Taking several geometrical parameters of the thin-walled tube as the design variables, taking the mass ratio energy absorption, the length ratio energy absorption, the maximum impact load as the objective functions, by comparing the accuracy of several approximate models constructed by different methods, it is found that the non- The degree of linearity is different, so the approximate model can be obtained with the highest accuracy. Finally, in combination with the best universal RBF method, the multi-objective crashworthiness of the spinal canal is optimized and the Pareto solution set and the Pareto surface in the design space are given to provide a variety of designs that focus on the optimization of different crashworthiness indexes Program.