Aplicação do Coeficiente de Hurst na Técnica de Monitoramento da Integridade Estrutural Baseada na Impedância Eletromecânica

Detalhes bibliográficos
Ano de defesa: 2020
Autor(a) principal: Venson, Giuliano Gardolinski
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Uberlândia
Brasil
Programa de Pós-graduação em Engenharia Mecânica
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: https://repositorio.ufu.br/handle/123456789/29347
http://doi.org/10.14393/ufu.te.2020.356
Resumo: This work presents the use of Hurst coefficient in structural health monitoring based on electromechanical impedance method. This method uses piezoelectric sensors coupled to the structure in order to detect impedance signatures changes that may be related to the presence of damage. The damage metrics are parameters used to quantify the changes in impedance signatures, which presents values very close to zero in structural no-damage condition and increases significantly as the damage becomes present. The Hurst coefficient will be presented and discussed as a new damage metric to assess changes in impedance signatures due to the presence of damage, in addition to the damage metrics already consolidated in the literature. To evaluate the effectiveness of Hurst coefficient in damage detection, a set of experiments were carried out on aluminum beams, submitted to tests without the presence of damage and with the presence of damage at different temperatures. The damage analysis is performed considering the comparison of the values obtained from Hurst with the existing damage metrics. The results show that the Hurst coefficient as a damage metric allows to detect the presence of damage in all test conditions, allowing to present and conclude on the advantages and disadvantages of the Hurst method in electromechanical impedance.