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Substructuring in flexible multibody dynamic models

Palthe, A.M. (2021) Substructuring in flexible multibody dynamic models.

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Abstract:Amusement rides often have large motions, introducing nonlinear equations of motion. This cannot be solved by finite element (FE) models. Multibody dynamic (MBD) analysis can account for large motions, but assumes all parts to be rigid. This research focuses on theme park rides consisting of a vertical rotating tower with moving gondolas attached, built by several manufacturers. Predicting the loads and internal stresses accurately is difficult, especially at the connection of the tower to the bearing. A case study is used to determine a method to combine FE and MBD analysis, to obtain a flexible model which can be used for structures with large motions. Multiple models are made of the tower in Matlab, Ansys and Adams and a static analysis is used to validate all models. Since validation of the Adams model was unsuccessful, there is more emphasis on the method of applying flexible multibody analysis. In the first dynamic analysis, the rotation of the tower is constrained. Removing this large motion should lead to similar results from the FE model and the flexible MBD model. The second dynamic analysis includes this rotation and comparing these results shows the added value of using a flexible MBD analysis.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
Link to this item:http://purl.utwente.nl/essays/86328
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