Controle de vibração de um sistema sob desbalanceamento rotativo utilizando atuador de liga com memória de forma

• Ano de defesa: 2011
• Autor(a) principal: Aquino, Alberdan Santiago de
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraí­ba; BR; Engenharia Mecânica; Programa de Pós-Graduação em Engenharia Mecânica; UFPB
• Palavras-chave em Português: Controle de sistemas; Memória de forma; Temperatura; Control systems; Shape memory alloy; Temperature; ENGENHARIAS::ENGENHARIA MECANICA
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/tede/5310

The vibration control is an important field of study within mechanical engineering, whose main objective is to reduce and control the vibration of a system. There are various techniques and methods for vibration control, and among them are those using dynamic vibration absorbers In this context, Shape Memory Alloys (SMA) can be used as actuators that help the active control of structures due to their ability to change the stiffness and damping. The SMA is part of a group of metallic materials which have the property returned to its original shape after mechanical deformation through a phase transition obtained by a thermal process. Metal alloys consisting of nickel and titanium (NiTi) can generate significant forces behind the change of shape, stiffness and damping temperature variation. In this thesis, we implement a fuzzy controller to reduce vibration of unbalanced rotating system using shape memory alloy actuator. Theoretical and experimental results of the system, controlled in critical regions, are presented, where level reductions of about 85% in the resonance region were observed.