基于多目标离散优化方法的高强度钢拼焊板的耐撞性研究

Crashworthiness design of high strength steel tailor-welded blank(TWB) based on multi-objective discrete optimization method

为提高高强度钢拼焊板结构的设计水平及可信度,提出一种基于多目标优化技术和连续正交方法的多目标离散优化设计方法,并将其应用于拼焊板结构件耐撞性设计中。首先建立了拼焊板结构的正碰有限元模型,并对比了3种不同拼焊组合条件下有限元仿真模型与试验的加速度时间曲线以及拼焊结构的变形模式,验证了有限元模型的准确性。然后,基于上述拼焊板结构碰撞有限元模型,采用提出的优化设计方法对高强度钢拼焊板的耐撞性进行了优化设计,优化后的结构在比吸能(SEA)满足约束条件的同时,峰值力下降49.2%,质量下降9.84%。优化结果表明,该设计方法能够较大地提高高强度钢拼焊板的耐撞性设计水平,具有较高的工程应用价值。

In order to improve the design level of high strength steel TWB,a multi-objective discrete optimization method which combines the multi-objective optimization and sequential orthogonal algorithm is proposed and successfully applied to the crashworthiness optimization of TWB structure.Firstly,the finite element model used in optimization is established and validated by experiments through the comparison of acceleration-time relation and deformation mode of three different TWB combinations.Then based on the finite element model,the proposed optimization method is used for the crashworthiness design of high strength TWB structure.The final optimized structure can meet the constraint of special energy absorption,and the peak force as well as the total weight can be reduced by 49.2%and 9.84%,respectively.The results show that the proposed method can be effectively applied to the crashworthiness of high strength steel TWB,which has high engineering application value.