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Sökning: LAR1:uu > Rapport > Wigren Torbjörn

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  • Chistiakova, Tatiana, et al. (författare)
  • Nonlinear system identification of the dissolved oxygen to effluent ammonium dynamics in an activated sludge process
  • 2018
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • Aeration of biological reactors in wastewater treatment plants is important to obtain a high removal of soluble organic matter as well as for nitrification but requires a significant use of energy. It is hence of importance to control the aeration rate, for example, by ammonium feedback control. The goal of this report is to model the dynamics from the set point of an existing dissolved oxygen controller to effluent ammonium using two types of system identification methods for a Hammerstein model, including a newly developed recursive variant. The models are estimated and evaluated using noise corrupted data from a complex mechanistic model (Activated Sludge Model no.1). The performances of the estimated nonlinear models are compared with an estimated linear model and it is shown that the nonlinear models give a significantly better fit to the data. The resulting models may be used for adaptive control (using the recursive Hammerstein variant), gain-scheduling control, L2 stability analysis, and model based fault detection.
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  • Martins da Silva, Margarida, et al. (författare)
  • An adaptive controller for propofol in anesthesia under synergistic remifentanil disturbances
  • 2012
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • An adaptive controller for propofol administration relying on a minimally parameterized SISO Wiener model for the depth of anesthesia is proposed. The exact linearization of this minimal Wiener structure using the continuous-time model parameters estimated online by an extended Kalman filter is a key point in the design. A linear quadratic Gaussian controller is developed for the exactly linearized system. The depth of anesthesia is considered to be measured by the bispectral index. Excellent results were obtained when the robustness of the proposed controller with respect to inter and intrapatient variability was assessed through simulations on a database of 500 patients. The closed-loop system showed good disturbance rejection properties when the synergistic effect of remifentanil in the depth of anesthesia was considered.
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  • Resultat 1-10 av 43

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