| 1. |
- Cervin, Anton, et al.
(author)
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How Does Control Timing Affect Performance?
- 2003
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In: Control Systems Magazine. - 0272-1708. ; 23:3, s. 16-30
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Journal article (peer-reviewed)abstract
- The article presents two Matlab-based tools for analysis andsimulation of real-time control systems: Jitterbug andTrueTime.Jitterbug allows the user to compute aquadratic performance criterion for a linear control system undervarious timing conditions. The control system is described using anumber of continuous- and discrete-time linear systems. Astochastic timing model with random delays is used to describe theexecution of the system. The tool can also be used to investigateaperiodic controllers, multirate controllers, and jitter-compensatingcontrollers.TrueTime facilitates event-based co-simulation of amultitasking real-time kernel containing controller tasks and thecontinuous dynamics of controlled plants. The simulations capture thetrue, timely behavior of real-time controller tasks and communicationnetworks, and dynamic control and scheduling strategies can beevaluated from a control performance perspective. The controllers canbe implemented as Matlab functions, C functions, or ordinarydiscrete-time Simulink blocks.A number of examples that illustrate the use of the tools are given.
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| 2. |
- Dumont, Guy A., et al.
(author)
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Wood Chip Refiner Control
- 1988
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In: IEEE Control Systems Magazine. - : Institute of Electrical and Electronics Engineers (IEEE). - 0888-0611 .- 0272-1708. ; 8:2, s. 38-43
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Journal article (peer-reviewed)abstract
- The authors treat the control of a chip refiner to produce wood pulp, where the incremental gain between the motor load and the plate gap is subject to sudden changes due to pad collapse. Passive adaptive control with fault detection, active suboptimal dual control, and dual-control solutions are discussed. For dual control, the choice of the control criterion is crucial, as it must reflect the peculiarities of the process. Two nonquadratic performance indices are proposed, and the myopic solutions are computed. Simulations show the superior performance offered by these indices.<>
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| 3. |
- Hjalmarsson, Håkan, 1962-, et al.
(author)
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Iterative feedback tuning : Theory and applications
- 1998
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In: IEEE Control Systems Magazine. - : Institute of Electrical and Electronics Engineers (IEEE). - 0272-1708 .- 2374-9385 .- 1066-033X .- 1941-000X. ; 18:4, s. 26-41
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Journal article (peer-reviewed)
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| 4. |
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| 5. |
- Murray, Richard, et al.
(author)
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Future Directions in Control in an Information-rich World
- 2003
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In: Control Systems Magazine. - 0272-1708. ; 23:2, s. 20-33
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Journal article (peer-reviewed)abstract
- The Panel on Future Directions in Control, Dynamics, and Systems was formed in April 2000 to provide a renewed vision of future challenges and opportunities in the control field, along with recommendations to government agencies, universities, and research organizations to ensure continued progress in areas of importance to the industrial and defense base. The panel released a report in April 2002, the intent of which is to raise the overall visibility of research in control, highlight its importance in applications of national interest, and indicate some of the key trends that are important for continued vitality of the field. After a brief introduction, we summarize the report, discuss its applications and education and outreach, and conclude with some recommendations.
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| 6. |
- Möllerstedt, Erik, et al.
(author)
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Out of Control Because of Harmonics - An Analysis of Harmonic Response of an Inverter Train
- 2000
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In: Control Systems Magazine. - : Institute of Electrical and Electronics Engineers (IEEE). - 0272-1708 .- 1066-033X .- 1941-000X. ; 20:4, s. 70-81
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Journal article (peer-reviewed)abstract
- Presents a method to use linear analysis to capture the frequency coupling of nonlinear and time-varying components. System stability is analyzed by connecting the harmonic transfer functions of the different component models. This facilitates an object-oriented approach to modeling, which supports reuse of models. An analysis of the complete railway system is, of course, difficult. Several locomotives can be moving along the power distribution line at the same time, and depending on the distance between them, the interaction changes. The power consumption also changes, depending on operating modes. During normal operation, energy is consumed from the network, but as modern locomotives use electrical braking, the power flow changes direction during deceleration, and energy is delivered back to the grid. The inverter trains are not passive systems. The converters are controlled with only limited system knowledge (local measurements of currents and voltages), making analysis and control design an even bigger challenge
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| 7. |
- Sanz, Ricardo, et al.
(author)
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Trends in Software and Control
- 2003
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In: Control Systems Magazine. - 0272-1708. ; 23:3, s. 12-15
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Journal article (peer-reviewed)abstract
- New software technologies are important for the future of control (and vice versa) in an age of increasing complexity. This paper discusses what are the trends.
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| 8. |
- Schmidt, H., et al.
(author)
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Identifying feedback mechanisms behind complex cell behavior
- 2004
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In: Control Systems Magazine. - 0272-1708. ; 24:4, s. 91-102
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Journal article (peer-reviewed)abstract
- An analysis method based on linearization and decomposition of the network model was used to examine the early embryonic periodiccelldivisions of Xenopus eggs. The components andfeedbackinterconnections that generate periodic oscillations and bistability in the Xenopuscellcycle were identified. Thefeedbackmechanismsdriving the periodic oscillations in yeast glycolysis were also clarified.
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| 9. |
- Wittenmark, Björn, et al.
(author)
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Dynamic pictures and interactive learning
- 1998
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In: Control Systems Magazine. - : Institute of Electrical and Electronics Engineers (IEEE). - 0272-1708 .- 1066-033X .- 1941-000X. ; 18:3, s. 26-32
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Journal article (peer-reviewed)abstract
- The paper presents interactive learning tools used in courses in automatic control at Lund Institute of Technology. The learning tools are aimed at improving the understanding of and intuition for the abstract parts of the control courses. The paper presents dynamic interactive modules for a course in sampled-data systems. The tools are implemented in Matlab and used over the Internet.
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| 10. |
- Årzén, Karl-Erik, et al.
(author)
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Laboratories and Real-Time Computing
- 2005
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In: Control Systems Magazine. - 0272-1708. ; 25:1, s. 30-34
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Journal article (peer-reviewed)abstract
- The paper describes the approach used at the Department of Automatic Control at Lund Institute of Technology to maintain a high level of practical laboratory experiments. The Department integrates laboratory experiments into its control courses. If the laboratory exercises are properly organized and the student volume is sufficiently large, it is possible to combine a high level of practical laboratory experiments in control education at a reasonable cost. The use of off-the-shelf hardware and open-source software are important, With desktop processes, it is possible to achieve high utilization of lab space and high student throughput.
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| 11. |
- Åström, Karl Johan, et al.
(author)
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Bicycle Dynamics and Control
- 2005
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In: Control Systems Magazine. - 0272-1708. ; 25:4, s. 26-47
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Journal article (peer-reviewed)abstract
- In this paper, the dynamics of bicycles is analyzed from the perspective of control. Models of different complexity are presented, starting with simple ones and ending with more realistic models generated from multibody software. Models that capture essential behavior such as self-stabilization as well as models that demonstrate difficulties with rear wheel steering are considered. Experiences using bicycles in control education along with suggestions for fun and thought-provoking experiments with proven student attraction are presented. Finally, bicycles and clinical programs designed for children with disabilities are described.
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