Projeto de controladores para a maximização de sistemas de captação de energia considerando excitação não ideal

• Ano de defesa: 2015
• Autor(a) principal: Ferreira, Douglas da Costa [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Controladores elétricos; Vibração; Sistemas lineares; Sistemas não lineares; Vibration
• Link de acesso: http://hdl.handle.net/11449/123742; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/21-05-2015/000830205.pdf

Harvesting systems harness the energy from the environment such as solar, thermal, electromagnetic and vibrational. Many projects of vibration energy harvesting systems use harmonic excitation in resonance with the system natural frequency to maximum vibration amplitude, resulting in a desirable amount of energy to transduction. However , the ambient vibration spectrum is large, which hampers the physical design of a system to capture energy for this purpose , it adds that the vibration environment is low frequency , which further complicates the design of a device of reduced size. In addition the ambient vibration in general does not remain in a single band and varying constantly. The ambient vibration can be modeled as a non-ideal excitation. The main objective of this thesis is to model a linear and non-linear vibration energy harvesting systems subject to periodic and non-ideal excitation and project controllers to improve the interaction of the system with excitation source increasing its efficiency. As a main result, it was observed that the non-ideal vibration provides more energy to the harvesting system than periodic excitation and that the controllers designed in particular LMI, achieved a significant result in efficiency gain