Reconstrução de falhas em sistemas com atrasos variantes de medição utilizando observadores por modos deslizantes
Ano de defesa: | 2019 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | |
Tipo de documento: | Tese |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal do Rio de Janeiro
Brasil Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia Programa de Pós-Graduação em Engenharia Elétrica UFRJ |
Programa de Pós-Graduação: |
Não Informado pela instituição
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Departamento: |
Não Informado pela instituição
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País: |
Não Informado pela instituição
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Palavras-chave em Português: | |
Link de acesso: | http://hdl.handle.net/11422/22743 |
Resumo: | This thesis presents a novel method for actuator fault reconstruction under mea- surement delays by means of sliding mode observers. The delay duration is con- sidered arbitrary, and may be constant or time-variant, possibly uncertain. The proposed approach has the advantage of being applicable to systems with measure- ments delays with no limitation regarding its duration, contrasting to other methods of the literature. The developed technique is applied to the case of sampled-output systems, where is possible to wait for some samples and apply more efficient inter- polation filters to improve fault reconstruction. The use of a predictor to estimate the state and fault signals in current time allows the application of this method to design a closed loop control law that rejects or attenuates the effect of the fault on the system output. An observer-predictor strategy is developed using the PDE- Backstepping method, which combined to a sliding mode control law is used to regulate the system output to zero, rejecting the fault effect. Another observer pre- dictor is developed using least-squares identification methods to estimate unknown parameters of a fault assumed parametrized. An application of the developed meth- ods to a simplified model of an intelligent completion valve used in oil and gas industry is also presented. In summary, the main contributions of this thesis are the development of a time-shifted observer to reconstruct failures in systems with ar- bitrarily long measurement delays and in systems with sampled outputs, and their application to the development of closed loop control strategies for systems with measurement delays. |