News Archive

Kolloquium talk on 16.07.2018 by Prof. Oliver Sawodny (Univ. Stuttgart)

Jul 10, 2018

Methoden der Systemdynamik in der Optomechatronik

Speaker: Prof. Sawodny, Institute für Systemdynamik, Universität Stuttgart

Date and location: Monday 16.07.2018 from 17:15 to 18:00 at the "Aquarium", Kaiserstr. 2, 2413 Kiel

Abstract

Im Vortrag werden anhand verschiedener Beispiele die Anwendung von Methoden der Systemdynamik auf Fragestellungen in der Optomechatronik vorgestellt. Diese findet vorzugsweise in der adaptiven Optik eine Anwendung. Nach einer kurzen Einführung in die grundsätzliche Thematik der adaptiven Optik werden Anwendungen im Kontext der Großteleskope vorgestellt. Hier werden verschiedene Ansätze wie beispielsweise zur Abbildungsverbesserung durch vorsteuernde Vibrationskompensation und eine Methode zur thermischen Drift-Kompensation präsentiert. Auch atmosphäreninduzierte Fehler können durch geeignete Modellierung und Methoden der Störgrößenkompensation wirksam unterdrückt werden. Abschließend werden Ansätze zur Modellierung und Steuerung adaptiver optischer Elemente in Laserresonatoren vorgestellt.

Kolloquium talk on 09.07.2018 by Prof. Rudibert King (TU Berlin)

Jul 10, 2018

Closed-loop active flow control of repetitive disturbances in a linear stator cascade

Speaker: Prof. Rudibert King, Chair of Measurement and Control, TU Berlin

Date and location: Monday 09.07.2018 from 17:15 to 18:00 at the "Aquarium", Kaiserstr. 2, 2413 Kiel

Abstract

This presentation demonstrates the mitigation of disturbances in a periodically throttled compressor stator cascade by closed-loop active flow control. The work is motivated by the replacement of a constant pressure combustion of a gas turbine with the significantly more efficient constant volume counterpart. One way of implementing a constant volume combustion is a pulse detonation engine. In such an engine, the heat addition takes place in a discontinuous, detonative manner while the inlets to the combustion tubes are closed. As a result, periodic pressure waves will be transmitted upstream into the compressor. A successful exploitation of this new combustion system therefore strongly depends on the ability to dampen negative effects resulting from these disturbances. To this end, active flow control is applied based on two different actuators for the sidewalls and the blade. Blowing fluidic switches are used to excite flow modes to decrease detrimental corner vortices and premature flow separation. For closed-loop control, the repetitive nature of the disturbances can be utilized to increase control performance. Three concepts will be considered here and compared. In iterative learning control (ILC), either in a frequency-based or time-based formulation, un-modeled nonlinear effects and disturbances are learned over the cycles to some extent and used to adapt the control inputs. As an alternative, repetitive model predictive control (RMPC) is introduced which more directly makes use of remaining control errors of a last cycle. RMPC and one of the ILC formulations, which solve respective optimization problems on-line, outperformed the considered frequency-based version of classical ILC with respect to control performance. However, the frequency domain ILC variant might benefit from its robustness features.

Prof. Meurer is speaker at the "Deutsch-Dänisches Automatisierungsforum"

May 15, 2018

Prof. Meurer will be a speaker at the "Deutsch-Dänisches Automatisierungsforum" (German-Danish Automation Forum). This meeting does constitute the German kickoff of the EU Interreg Project "InProReg". Further information is available here.

Thomas Meurer new Vice-Chair of VDI/GMA Technical Division 1

Mar 28, 2018

In March 2018 Prof. Meurer has been elected as Vice-Chair of the Technical Division 1 'Fundamentals and Methods of Measurement and Automatic Control' of the VDI Society Measurement and Automatic Control (GMA). 

Thomas Meurer is speaker and panel member at conference "Arbeiten 4.0"

Jan 26, 2018

Prof. Meurer will be a speaker and participant at a panel discussion during the conference "Arbeit 4.0", which will take place in Kiel on March 6th, 2018. Further information is available here: www.konferenz-4-0.de

New publication on model-based control in deep drawing processes

Feb 13, 2018

Böhm, T.; Meurer, T.: Trajectory Planning and Tracking Control for the Temperature Distribution in a Deep Drawing Tool, Control Engineering Practice, 64, 127-139, 2017.

Use this link provided by the publisher to access the article without registration or sign-up (valid until June 24th, 2017).

Abstract

The deep drawing process and the resulting product quality essentially rely on the temperature distribution inside the tool. For temperature manipulation and control a flatness-based design technique for thermal trajectory planning and feedforward control for a deep drawing tool is developed based on a distributed parameter system description. Heating cartridges, that are embedded into the tool structure, serve as actuators to insert energy into the system with the desire to transfer the spatial-temporal temperature distribution from an initial to a desired final stationary profile. To address the complex-shaped geometry of the tool a high-order finite element (FE) approximation is deduced and combined with model-order reduction techniques to determine a sufficiently low order system representation that is applicable for optimal actuator placement. For this, a mixed-integer optimization problem is formulated based on a particular reduced-order formulation of the controllability Gramian. The resulting actuator configuration is exploited for flatness-based trajectory planning by constructing a virtual output that differentially parametrizes any system state and input. This implies a particularly intuitive approach to solve the thermal trajectory planning problem. Convergence of the differential parametrization is analyzed in the continuous limit as the finite element approximation approaches the continuum model. Re-summation techniques are integrated into the design to enhance the domain of applicability of the approach. The feedforward control is combined with industry-standardized proportional-integral-derivative (PID) output error feedback control within the so-called two-degree-of-freedom (2DOF) control concept. Simulation and experimental results obtained for a fully equipped forming tool are presented and confirm the applicability of the proposed design technique and the tracking performance. In addition, the results of this paper present a first experimental validation of flatness-based trajectory planning for thermal systems with three-dimensional spatial domain.

New DFG-ANR cooperation project has started

Feb 13, 2018

The project "Interconnected infinite-dimensional systems for heterogeneous media" (INFIDHEM) has started with a kick-off meeting in Lyon from March 1st to 2nd, 2017.  The project is devoted to the analysis and the control of partial differential equations and the technological application of the developed methods. This German-French research project is jointly funded by the Deutsche Forschungsgemeinschaft (DFG) and its French counterpart, L'Agence nationale de la recherche (ANR), for a period of three years with a volume of 1.4 Mio. EUR. 

Project partners are

  • Wuppertal University (Prof. Birgit Jacob)
  • Technical University Munich (Prof. Boris Lohmann)
  • Kiel University (Prof. Thomas Meurer)
  • École Nationale Supérieure de Mécanique Microtechniques (Prof. Yann Le Gorrec)
  • Université Claude Bernard Lyon 1 (Prof. Bernhard Maschke)
  • École Nationale Supérieure de l’Aéronautique et de l’Espace (Prof. Denis Matignon)


Links:

All submissions for the 2017 IFAC World Congress in Toulouse accepted!

Feb 27, 2017

All submissions of the Chair of Automatic Control for upcoming IFAC World Congress in Toulouse have been accepted. This includes the following four invited session and regular papers:

  • Meurer, T.: Some perspectives in PDE control
  • Freudenthaler, G.; Goettsch, F.; Meurer, T.: Backstepping-based extended Luenberger observer design for a Burgers-type PDE for multi-agent deployment
  • Kater, A.; Wriedt, J.-P.; Meurer, T.: Finite Element Modeling and Motion Planning of an Adaptive Elastic Wingsail
  • Schaum, A.; Weisbarth, H.; Meurer, T.: Robust adaptive output-feedback tracking control for microalgae cultures

the invited session

  • History of the Control of Distributed Parameter Systems, co-organized by Prof. Thomas Meurer (Kiel) and Prof. Denis Dochain (Louvain)

and the open invited track

  • Recent trends in modeling, estimation and control with PDEs, co-organized by Prof. Thomas Meurer (Kiel) and Prof. Yann Le Gorrec (Besancon).

Thomas Meurer new chair of VDI/GMA Technical Committee 1.40

Sep 25, 2016

In September 2016 Prof. Meurer has been elected as new chair of the Technical Committee 1.40 'Theoretical Methods of Closed-loop Control Engineering' of the VDI Society Measurement and Automatic Control (GMA). 

Further information about the activities of the committee can be found here (in German). 

Half-Day workshop on "New trends in control of distributed parameter systems" accepted for the 55th IEEE CDC in Las Vegas

Jul 07, 2016

The half-day workshop "New trends in control of distributed parameter systems" by Yann Le Gorrec, Thomas Meurer, Miroslav Krstic has been accepted for the 55th IEEE Conference on Decision and Control (CDC) to be held in Las Vegas (US) from December 12-14th, 2016. For further information consult the CDC workshop webpage.

Thomas Meurer invited speaker at the workshop "Stability and Control of Infinite-Dimensional Systems" in Passau

Feb 13, 2015

For details consult the website of the workshop.

Keynote Paper at IFAC DYCOPS-CAB 2016

May 17, 2016

The paper "Pointwise innovation-based state observation of exothermic tubular reactors" co-authored by A. Schaum, J. Alvarez, T. Meurer, and J. Moreno has been selected as Keynote Paper for the IFAC Symposium on Dynamics and Control of Process Systems (DYCOPS-CAB) to be held in Trondheim (NO) from June 6-8, 2016.

Thomas Meurer appointed Associate Editor for IFAC Journal Automatica

Mar 20, 2014

Thomas Meurer awarded the Kardinal-Innitzer-Förderungspreis

Dec 15, 2012

Thomas Meurer has received this award for his habiliation thesis entitled "Contributions to Motion Planning and Tracking Control for Distributed-Parameter Systems in Single- and Higher-Dimensional Spatial Domains" completed at the Technical University Vienna. An extended version of this contribution is published with Springer-Verlag

Research