Identificação de danos estruturais a partir do modelo de superfície de resposta

• Ano de defesa: 2014
• Autor(a) principal: Rangel, Isabela Cristina da Silveira e Silva
• Orientador(a): Stutz, Leonardo Tavares
• Banca de defesa: Platt, Gustavo Mendes , Corrêa, Rosilene Abreu Portella , Moreno, Alberto Sergio Pietro
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade do Estado do Rio de Janeiro
• Programa de Pós-Graduação: Programa de Pós-Graduação em Modelagem Computacional
• Departamento: Centro de Tecnologia e Ciências::Instituto Politécnico
• País: BR
• Palavras-chave em Português: Frequências naturais; Evolução diferencial; Projeto ótimo de experimentos; Superfícies de resposta (Estatística) - Modelos matemáticos; Ruína de estruturas Modelos matemáticos; Otimização matemática; Planejamento experimental Modelos matemáticos; Estabilidade estrutural Modelos matemáticos
• Palavras-chave em Inglês: Identification of structural damage; Natural frequencies; Response surface model; Differential evolution; Optimal design of experiments
• Área do conhecimento CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::MATEMATICA::MATEMATICA APLICADA
• Link de acesso: http://www.bdtd.uerj.br/handle/1/13802

The identification of structural damage is an issue of fundamental importance in engineering, since a structure is subject to deterioration processes and to the occurrence of damage throughout its useful lifetime. The presence of damage compromises the performance and structural integrity, may put human lives at risk and may result in considerable economic losses. Damage identification and structural health monitoring techniques built on Finite Element Model (FEM) updating are constant in the specialized literature. However, the problem generally rank deficient and the high computational cost, inherent to these techniques, limit or even render their applicability in structures that require a high order model. To circumvent these difficulties, in the formulation of the damage identification problem, one may use a Response Surface Model (RSM) in place of a FEM of the structure. In the present work, the identification of structural damage considers the update of a RSM of the structure, with the aim at minimizing an error function defined from the experimental natural frequencies and the corresponding natural frequencies prescribed by a RSM. The problem of structural damage identification in a simply supported Euler-Bernoulli beam is studied, taking into account the natural frequencies in the inverse problem formulation. The behavior of a simply supported Euler-Bernoulli beam, in the presence of damage, is analyzed, in order to verify the identification of regions where the damage identification may present greater difficulties. In the damage identification process, in the present work, after a suitable choice of the type of the response surface model, the surface model is derived considering the experimental data selected from an optimal design of experiments. The use of the Differential Evolution (DE) method in the inverse problem of damage identification is considered. Considering the numerical results obtained, the strategy adopted proved to be able to locate and quantify the damage with high accuracy, showing the capability of the proposed damage identification model.