The Impact of High-Fidelity Model Geometry on Test-Analysis Correlation and FE Model Updating Results

Structural responses obtained with finite element simulations normally differ from those measured on physical prototypes. In the case of monolithic structures, the differences between the simulated and measured responses are mainly caused by inaccuracies in the geometry and material behavior. The present work focuses on evaluating the impact of using a high-fidelity representation of the actual geometry on the differences between measured and computed resonant frequencies and mode shapes.
This paper presents a study that was performed on a cast-iron lantern housing of a gear box. In a first step, the resonant frequencies and modes shapes of the test structure were measured using impact testing. Next, optical scanning and photogrammetric techniques were used to obtain a 3D virtual point cloud model which accurately describes the surface of the lantern housing. This point cloud was then used to generate a 3D solid finite element model representing the as-built geometry of the housing.

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