• Adapting dynamic mathematical models to a pilot anaerobic digestion reactor 

      Haugen, Finn; Bakke, Rune; Lie, Bernt (Journal article; Peer reviewed, 2013)
      A dynamic model has been adapted to a pilot anaerobic reactor fed diarymanure. Both steady-state data from online sensors and laboratory analysis anddynamic operational data from online sensors are used in the model ...
    • Co-operative sensor fusion using time warping in multimodal tomometry for process con 

      Pradeep, Chaminda; Ru, Yan; Mylvaganam, Saba (Journal article; Peer reviewed, 2012)
      Recent studies in process tomography have mostly focused on image processing and enhancement of images obtained from Electrical Capacitance, Electrical Resistance, Electrical Impedance, Gamma- and X-ray- tomographic ...
    • Model Predictive Control with Integral Action: A simple MPC algorithm 

      Di Ruscio, David Luigi (Journal article; Peer reviewed, 2013)
      A simple Model Predictive Control (MPC) algorithm of velocity (incremental) form is presented. The proposed MPC controller is insensitive to slowly varying system and measurement trends and therefore has integral action. ...
    • Multimodal Tomometry for Slug Detection in two Phase Flow 

      Pradeep, Chaminda; Ru, Yan; Mylvaganam, Saba (Journal article; Peer reviewed, 2012)
      Electrical Capacitance and Resistance Tomometric (ECTm/ ERTm) approaches are attractive for measurement and control applications in the process industries. By using the time series of raw resistance and capacitance values ...
    • On-Off and PI control of methane gas production of a pilot anaerobic digestion reactor 

      Haugen, Finn; Bakke, Rune; Lie, Bernt (Journal article; Peer reviewed, 2013)
      A proposed feedback control system for methane flow control of a real pilot anaerobic digestion reactor fed with dairy waste is designed and analyzed using the modified Hill model, which has previously been adapted to the ...
    • Optimal control strategies with nonlinear optimization for an Electric Submersible Pump lifted oil field 

      Sharma, Roshan; Glemmestad, Bjørn (Journal article; Peer reviewed, 2013)
      In an Electric Submersible Pump (ESP) lifted oil field, the ESP of each oil well should be operated inside its operating window. The total power consumed by the ESPs in the oil field should be minimized. The speed of the ...
    • Parameter and State Estimation of Large-Scale Complex Systems Using Python Tools 

      Perera, M. Anushka S.; Hauge, Tor Anders; Pfeiffer, Carlos Fernando (Journal article; Peer reviewed, 2015)
      This paper discusses the topics related to automating parameter, disturbance and state estimation analysis of large-scale complex nonlinear dynamic systems using free programming tools. For large-scale complex systems, ...
    • Relaxed Ziegler-Nichols closed loop tuning of PI controllers 

      Haugen, Finn; Lie, Bernt (Journal article; Peer reviewed, 2013)
      A modification of the PI setting of the Ziegler-Nichols closed loop tuningmethod is proposed. The modification is based on a combination of the Skogestad SIMCtuning formulas for ´´integrator plus time-delay´´ processes ...
    • Second order scheme for open channel flow 

      Sharma, Roshan (Professional article, 2015-08-26)
      In the search for a numerical scheme which: (i) is semi-descrete in nature (only space discritization) so that built-in ODE solvers in MATLAB or Modelica can be used, (ii) can handle dry bed conditions (island or dry ...
    • Structural observability analysis of large scale systems using Modelica and Python 

      Perera, M. Anushka S.; Lie, Bernt; Pfeiffer, Carlos Fernando (Journal article; Peer reviewed, 2015)
      State observability of dynamic systems is a notion which determines how well the states can be inferred from input-output data. For small-scale systems, observability analysis can be done manually, while for large-scale ...
    • Temperature control of a pilot anaerobic digestion reactor 

      Haugen, Finn; Bakke, Rune; Lie, Bernt (Journal article; Peer reviewed, 2013)
      Results of analysis and design and implementation of a temperature control system for a practical pilot anaerobic digestion (AD) bioreactor fed with dairy waste are presented. A dynamic model of the reactor temperature is ...
    • Where impact got going 

      Tiller, Michael; Winkler, Dietmar (Journal article; Peer reviewed, 2015-09-18)
      This paper discusses the impact package manager. The primary goal of this project is to support the development of a healthy eco-system around Modelica. For many other languages, the existence of an easy to use package ...