DECAT - Departamento de Controle e Automação

URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/490

Navegar

Filtros

2008 - 20102

Configurações

Assunto: search.filters.subject.Data acquisition

Resultados da Pesquisa

Agora exibindo 1 - 2 de 2
  • Nenhuma Miniatura Disponível
    Item
    Experimental characterization of nonlinear systems : a real-time evaluation of the analogous Chua’s circuit behavior.
    (2010) Rocha, Ronilson; Andrucioli, Guilherme Lucio Damião; Torricos, Rene Orlando Medrano
    This paper presents an experimental characterization of the behavior of an analogous version of the Chua’s circuit. The electronic circuit signals are captured using a data acquisition board (DAQ) and processed using LabVIEW environment. The following aspects of the time series analysis are analyzed: time waveforms, phase portraits, frequency spectra, Poincaré sections, and bifurcation diagram. The circuit behavior is experimentally mapped with the parameter variations, where are identified equilibrium points, periodic and chaotic attractors, and bifurcations. These analysis techniques are performed in real-time and can be applied to characterize, with precision, several nonlinear systems.
  • Nenhuma Miniatura Disponível
    Item
    Aeration strategy for controlling grain storage based on simulation and on real data acquisition.
    (2008) Lopes, Daniela de Carvalho; Martins, José Helvecio; Lacerda Filho, Adílio Flauzino; Melo, Evandro de Castro; Monteiro, Paulo Marcos de Barros; Queiroz, Daniel Marçal de
    In this work a new control strategy for grain aeration systems was proposed. This strategy was implemented in a software package called AERO and relates four conditions which depend on real time data acquisition and on the process simulation. The main advantage of AERO controller is that it can be used in different geographic regions, during different seasons and with different aeration systems, automatically adjusting its set points. The objectives of AEROcontroller are to equalize the temperatures inside the bin, to cool the grain mass whenever is possible and to maintain the moisture content under safe conditions. The results showed that the proposed strategy is efficient to achieve these objectives. Moreover, significant energy saving has been achieved with the AERO controller.