Abstract
Modal analysis is commonly performed in a vehicle development process to assess dynamic responses of structure designs. This paper presents an adaptive quadrilateral refinement process for modal analysis of elastic shells based upon a posteriori error estimation in natural frequencies. The process provides engineers with an estimation of their modal analysis quality and an effective adaptive refinement tool for quadrilateral meshes. The effectiveness of the process is demonstrated on the eigenvalue analyses of two numerical examples, a shock tower cap and a roof structure. It shows that the solution error in the frequency of interest is effectively reduced through the adaptive refinement process, and the resulting frequency of interest converges to the solution of a very fine model.
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Acknowledgements
The error estimation software employed in this research was developed by Prof. J. T. Oden, Dr. Serge Prudhomme and Dr. Jon Bass of the Institute for Computational Engineering and Sciences at the University of Texas at Austin, as part of the Development Of A Post-Processor For A Posteriori Error Estimation Of Quantities Of Interest project sponsored by General Motors Corporation.
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Botkin, M.E., Wang, HP. An adaptive mesh refinement of quadrilateral finite element meshes based upon an a posteriori error estimation of quantities of interest: modal response. Engineering with Computers 20, 38–44 (2004). https://doi.org/10.1007/s00366-004-0274-6
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DOI: https://doi.org/10.1007/s00366-004-0274-6