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Träfflista för sökning "hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Elektroteknik och elektronik) ;pers:(Hägglund Tore)"

Sökning: hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Elektroteknik och elektronik) > Hägglund Tore

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  • Berner, Josefin, et al. (författare)
  • An experimental comparison of PID autotuners
  • 2018
  • Ingår i: Control Engineering Practice. - : Elsevier BV. - 0967-0661. ; 73, s. 124-133
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper two novel autotuners are compared with two industrially available ones. The aim is to see if the research frontline can improve the industry standard of today. Experiments are made on three laboratory processes with different characteristics. Two lag-dominated processes of which one is a level control problem with fast dynamics, and one a temperature control problem with slow dynamics, as well as one delay-dominated level control process. Both the experiments and the obtained controller performances are evaluated and discussed. The results show that the performance of the stateof-the-art industrial autotuners can be significantly improved.
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  • Berner, Josefin, et al. (författare)
  • Asymmetric relay autotuning - Practical features for industrial use
  • 2016
  • Ingår i: Control Engineering Practice. - : Elsevier BV. - 0967-0661. ; 54, s. 231-245
  • Tidskriftsartikel (refereegranskat)abstract
    • The relay autotuner provides a simple way of finding PID controller parameters. Even though relay autotuning is much investigated in the literature, the practical aspects are not that well-documented. In this paper an asymmetric relay autotuner with features such as a startup procedure and adaptive relay amplitudes is proposed. Parameter choices and handling of noise, disturbances, start in non-steady state and other possible error sources are discussed. The autotuner is implemented and tested in an industrial air handling unit to show its use in practice. The experiments show good results, and prove that the proposed simple autotuner is well-suited for industrial use. But the experiments also enlighten possible error sources and remaining problems.
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  • Berner, Josefin, et al. (författare)
  • Autotuner identification of TITO systems using a single relay feedback experiment
  • 2017
  • Ingår i: IFAC-PapersOnLine. - : Elsevier BV. - 2405-8963. ; 50:1, s. 6619-6623
  • Tidskriftsartikel (refereegranskat)abstract
    • Relay autotuning has proven very successful for single-input single-output systems. This paper proposes an identification method for relay autotuning of systems with two inputs and two outputs (TITO systems). The combination of asymmetric relay feedback and output error identification admits short tuning time, without the need for limit cycle convergence. The method is successfully demonstrated on relevant system models, including the Wood-Berry distillation column.
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10.
  • Berner, Josefin, et al. (författare)
  • Improved Relay Autotuning using Normalized Time Delay
  • 2016
  • Ingår i: American Control Conference (ACC), 2016.
  • Konferensbidrag (refereegranskat)abstract
    • The relay autotuner provides a simple way offinding PID controllers of sufficient performance. By usingan asymmetric relay function the excitation of the process isimproved. This gives better models, and hence a better tuning,without increasing the time consumption or complexity of theexperiment. Some processes demand more accurate modelingand tuning to obtain controllers of sufficient performance.These processes can be singled out by their normalized timedelays and be subject to further modeling efforts. The autotunerproposed in this paper provides a simple way of findingthe normalized time delay from the experiment, and uses itfor model and controller selection. The autotuner has beenimplemented and evaluated both in a simulation environmentand by industrial experiments.
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