2017-07-072022-04-262022-04-262016-03-08FONSECA JÚNIOR, L. A. Técnica de redução de modelos improved reduced system enriched aplicada ao estudo do comportamento de sistemas mecânicos não lineares. 2016. 121 f. Dissertação (Mestrado em Modelagem e Otimização) - Universidade Federal de Goiás, Catalão, 2016.http://repositorio.ufcat.edu.br/tede/handle/tede/7503Currently, the structures are increasingly diverse and complex. In many cases, these structures are model by numerical approximations methods because, due to its complexity, the analytical model does not exist or is not feasible. The finite element method is a numerical approximation methods most used. Thus, the model generated by the finite element method is in most cases considerably too large, and the time taken to perform computer simulations is high. In this context, models reduction methods, it has been studied to meet the need of accurate results while maintaining the dynamic properties of the structure with less processing time. A comparative study of three reduction methods will be presented, the Improved Reduced System (IRS) and the Iterative Improved Reduced System method (IIRS). The third reduction method, it is an enrichment of the IRS method proposed by the author, which provided great improvement in time savings during simulations. This method was called Improved Reduced System Enriched (IRSE). Such reduction methods were applied in non-linear systems with non-localized linear and geometric nonlinearity due to large displacements. Keywords: Finite element method, nonlinear modeling, not linearity located and geometric, reduced models.application/pdfAcesso AbertoMétodo dos elementos finitosModelagem não linearNão linearidade localizada e geométricaRedução de modelosFinite element methodNonlinear modelingNot linearity located and geometricReduced modelsCIENCIAS EXATAS E DA TERRA::MATEMATICADissertação