Abstract

Surrogate-based finite element (FE) model updating of two welded plates is performed using experimental modal parameters in an optimization framework based on a multi-objective genetic algorithm. Since there are some uncertainties in the structure, sensitivity analysis is conducted to investigate the effect of different geometric and material properties on the modal parameters. Moreover, because the welding process introduces some residual stresses to the plates, the effect of using the pre-stressed modal analysis in the updating process is also investigated. Based on the obtained results, considering the pre-stressed condition reduces the errors of the updated FE model.

摘要

在基于多目标遗传算法的优化框架中，使用实验模态参数对两块焊接板进行基于替代的有限元 (FE) 模型更新。由于结构中存在一些不确定性，因此进行敏感性分析以研究不同几何和材料特性对模态参数的影响。此外，由于焊接过程会给板材带来一些残余应力，因此还研究了在更新过程中使用预应力模态分析的效果。基于获得的结果，考虑预应力条件减少了更新的有限元模型的误差。