CILAMCE2017-1204 STRUCTURAL RELIABILITY METHODS AND DESIGN OPTIMIZATION UNDER UNCERTAINTIES

Damage identification in a multi-DOF system under uncertainties using optimization algorithms

Ricardo Fernandes Ribeiro¹; Thiago G Ritto¹; Haroldo Fraga de Campos Velho²; Jose Herskovits Norman¹

¹ UFRJ; ² INPE

doi:10.20906/CPS/CILAMCE2017-1204

Resumo

In this article four optimization algorithms are applied to identify damage in a multi- DOF dynamical system, composed by masses, springs and dampers. The damage is introduced artificially by choosing a lower value for the stiffness. The algorithms applied are: Nelder- Mead Simplex, BFGS Quasi-Newton, interior point, and sequential quadratic programming - SQP. In addition, some different strategies to identify damage are applied. First, a deterministic analysis is performed to identify the damage; i.e, the values of the stiffnesses. Then, random forces are considered, and after, the stiffness values are considered uncertain. The difference among the results are analyzed.

Palavras-chave: structural dynamics; damage identification; uncertainties; optimization algorithm

Como citar

Ricardo Fernandes Ribeiro; Thiago G Ritto; Haroldo Fraga de Campos Velho; Jose Herskovits Norman. “Damage identification in a multi-DOF system under uncertainties using optimization algorithms”. XXXVIII Ibero-Latin American Congress on Computational Methods in Engineering. CILAMCE2017. 2017. DOI: 10.20906/CPS/CILAMCE2017-1204