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Challenges in Modeling Flexible Bodies based on Experimental Data with Utilization in Elastic Multibody Simulation
Author(s) -
Lein Claudius,
Beitelschmidt Michael,
Woller Johannes
Publication year - 2017
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201710046
Subject(s) - stiffness , modal , reduction (mathematics) , range (aeronautics) , computer science , modal analysis , experimental data , software , mechanical engineering , structural engineering , algorithm , engineering , finite element method , materials science , mathematics , geometry , aerospace engineering , statistics , polymer chemistry , programming language
The Elastic Multi‐Body Simulation (EMBS) is the state‐of‐the‐art method when dealing with elastic deformations of components in complex mechanical systems. But the required FE‐model representing the elastic structure contains several uncertainties concerning geometry, local and directional stiffness as well as damping phenomena. A mandatory Model Order Reduction (MOR) embodies further approximation errors. Due to the drawbacks of the conventional procedure, a novel approach is suggested, where the data of the elastic body model is directly gained from the results of an Experimental Modal Analysis (EMA). Therefore, the measured data is transferred to the Standard Input Data (SID) format by means of the software MORPACK (Model Order Reduction PACKage). The novel approach yields several challenges for which adequate solutions are presented. The feasibility is demonstrated at the example of an U‐section. The accuracy in the higher frequency range can be increased, which is especially important for vibro‐acoustic simulations. (© 2017 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)