Identifying dynamic critical components of a gantry based lasercutting machine using a validated FE model

To predict and reduce dynamic-related issues within manufacturing machinery, physics-based models, such as finite element (FE) models, are of importance. This work investigates how to set up and validate an accurate FE model of a gantry-based laser-cutting machine. Using an experimental static displacement test and modal analysis, it was found that the proposed FE model shows deviations of 48% and 30% in static displacement and modal data compared to the actual machine. To improve the model’s accuracy, a model updating procedure is applied to the model. From this, it was concluded that model updating could be a promising procedure to increase model accuracy. However, during the model updating procedure of the model, no convergence was achieved, which is expected to be a result of wrongly selected updating parameters. Next to this, it is shown that using the FE model, resonance and acceleration force induced displacements could be predicted. To reduce these dynamic related issues, it is proposed to select critical components based on the simulated mode shapes and displacement plots.