This paper presents the finite element modelling method for representing a laser spot welded structure and the use of a modal based updating method to improve the dynamic behaviour of the finite element model. Three different types of element connectors which are RBE2, ACM2 and CWELD ELPAT format are used to construct the finite element model of the laser spot welded structure. The accuracy of the natural frequencies and mode shapes obtained from the three models are compared with the measured counterparts. The measured dynamic behaviour is obtained using an impact hammer and roving accelerometers under free-free boundary conditions. NASTRAN SOL 200 is used for updating the finite element model in light of the measured results. In this study, it is found that using the modal based updating method provides an efficient and systematic way to successfully reconcile the CWELD based finite element model of the laser spot welded structure with the actual test structure.
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机译：本文介绍了用于代表激光点焊结构的有限元建模方法，以及使用模态的更新方法来提高有限元模型的动态行为。三种不同类型的元素连接器，其是RBE2，ACM2和CWELE ELPAT格式用于构造激光点焊结构的有限元模型。将从三种模型获得的自然频率和模式形状的准确性与测量的对应物进行比较。在无自由边界条件下使用冲击锤和粗糙加速度计获得测量的动态行为。 Nastran Sol 200用于根据测量结果更新有限元模型。在该研究中，发现使用基于模式的更新方法提供了一种有效和系统的方法，可以通过实际测试结构成功地协调激光点焊结构的基于CWELD的有限元模型。
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