Navegando por Autor "MEDEIROS, Renan Landau Paiva de"

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Acesso aberto (Open Access)
Estratégia de identificação paramétrica aplicada à modelagem fenomenológica de um sistema do tipo correia transportadora industrial para fins de detecção de faltas
(Universidade Federal do Pará, 2014-07) MEDEIROS, Renan Landau Paiva de; BARRA JUNIOR, Walter; http://lattes.cnpq.br/0492699174212608
Belt conveyor systems are essential for large companies, even though this equipment has a great deal of importance that makes its non-planned stop can generate huge amounts of losses or even the stall of the whole production process. Having this importance in mind it becomes necessary to realize the adequate monitoring of the system and detect with a larger prior notice the occurrence of some fault in the system. In an effort to reduce the unforeseen stop, this dissertation investigates a modeling of a belt conveyor system. At first a phenomenological model of the process is discussed based on the mechanical laws and considering the diverse types of movement opposition force throughout the belt conveyor. The main parameters of a belt conveyor belt where estimated through the non-recursive mean square. In sequence a fault detection algorithm was elaborated using the interval analysis theory, in a way that its possible to detect inadequate operation conditions. With the intent to evaluate the performance of the proposed algorithm a prototype that emulates the tipical operation of a conveyor belt was designed. The results were obtained experimentally, that confirms the great performance of the proposed methodology.
Acesso aberto (Open Access)
Investigação de estratégias de controle robusto multivariável descentralizado aplicadas à melhoria do desempenho de um conversor de potência CC/CC do tipo buck com estrutura single inductor multiple output
(Universidade Federal do Pará, 2018-02-05) MEDEIROS, Renan Landau Paiva de; BARRA JUNIOR, Walter; http://lattes.cnpq.br/0492699174212608
The DC/DC power converter systems are important devices to use in several applications in many sectors of the society. For this reason, several DC/DC converter topologies are developed to improve the performance of devices, aiming at reducing losses and improving the converter energy quality. However, such improvements should assess the control strategies that enable the correct functioning of the power converters. This works covers experimental assessment of the design of robust decentralized multivariable controller applied to a specific topology of the multivariable step-down power converter, where a single inductor element is shared by multiples outputs. Furthermore, it is important to ensure the system stability, as well as the multiple outputs regulations, however some difficulties remains, e.g., hard coupling between system’s outputs, non-linearities due to the inductive element and uncertainties due to imprecision of mathematical models and/or variation of nominal values of the discrete elements that compose the DC/DC converter. Aiming to assess the performance of the proposed design methodology for a multivariable robust controller, to perform experiments of parametric variations on the DC/DC power converter, it is developed several experimental tests and simulations using the Matlab. The results show the improved performance of the proposed methodology.