基于Kriging代理模型的结构损伤识别新方法

A New Structural Damage Identification Method Based on Kriging Surrogate Model

提出一种基于Kriging代理模型的损伤识别方法。利用初始样本建立结构响应与结构损伤参数之间的关系,代替原结构响应与结构物理参数之间的关系,有效减少损伤识别过程中反复调用有限元软件对结构进行网格划分和有限元计算的次数,提高了识别效率。采用加点准则对代理模型进行修正,保证代理模型可以准确反映结构响应与结构损伤参数之间的关系。通过一个管梁结构的数值算例验证了所提方法的有效性。最后,将该方法应用于某导弹发射台模型的损伤识别中,实验结果表明,该方法可应用于工程实际。

A new damage identification method was proposed based on Kriging surrogate model. The initial samples were used to construct the initial Kriging surrogate model to represent the relationship between the dynamic response and the structural damage parameters instead of that between the dynamic response and the structural physics parameters. Reducing the finite element mesh generation and the finite element calculation during the damage identification effectively,the efficiency of damage identification was improved. Updating the Kriging surrogate model by sampling criterion,making sure the Kriging surrogate model might exactly describe the relationship between the dynamic response and the structural damage parameters. A numerical example of a tube and grider structure was given to prove the effectiveness of the method. Finally,the method was used in damage identification of a missile launch platform model. The results show that the method is effective.