基于组合近似模型的轻量化设计方法

针对传统结构优化设计方法效率低、计算量大等缺陷，提出一种基于组合近似模型的轻量化设计方法。以某型号内燃叉车的两级门架结构为例，通过熵权TOPSIS综合贡献度分析方法筛选出对门架性能影响最大的上下翼缘及腹板厚度作为轻量化的设计变量，采用最优拉丁超立方设计方法进行样本点采集，得到包含设计变量和性能响应的100个样本点，分别构建外门架质量、最大应力、最大变形的组合近似模型，结合二次序列规划算法展开轻量化设计，结果表明：外门架经过优化后，质量减小13.36%，最大应力减小4.65%。

Lightweight Design Method Based on Combined Approximation Model

Aiming at the defects of low efficiency and large computational complexity of traditional structural optimization design methods, a lightweight design method was proposed based on combined approximation model. Taking the two-stage gantry structure of a certain type of internal combustion forklift as an example, the upper and lower flanges and web thicknesses that had the greatest influences on the performance of the gantry were selected as the lightweight design variables by TOPSIS method. 100 sample points including design variables and performance responses were obtained based on Opt-LHD method. Combined approximation model of outer gantry mass, maximum stress, and maximum deformation were constructed, combined with quadratic sequence programming algorithm， the lightweight design was developed. And the results show that the quality of the outer gantry is reduced by 13.36% and the maximum stress is reduced by 4.65%.