E-Delay Systems letter Issue: 2, April 2008
|
Invited Contributions |
Lyapunov-based Model Predictive Control of Nonlinear Systems Subject to Time-Varying Measurement Delay David Munoz de la Pena from Universidad de Sevilla The problem of designing feedback control systems for nonlinear systems subject to time-varying |
Some Numerical Methods to Compute the Eigenvalues of a Time-Delay System Using Matlab Elias Jarlebring from TU Braunschweig Several properties of time-delay systems can determined from the set of solutions of the characteristic equation. We mention some ways to numerically determine parts of this solution set using the popular tool Matlab. In particular, we give illustrative Matlab code for some methods and discuss methods suitable for problems of very large dimension. Click to continue (PDF) |
| Conference Announcements |
||||||||||||||||||||||||||||||||||||||||||||||
| 2008 American Control Conference Seattle, Washington, USA, June 11 - 13, 2008 http://www.a2c2.org/conferences/acc2008/
|
||||||||||||||||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||||||||||
17th IFAC World Congress Seoul, Korea, July 6-11, 2008 Session titles related to time delay systems: Time Delay Systems Tools and Methods in Time-Delay System Theory and Control Time Delay Systems: Stability Analysis Time Delay Systems: Stabilisation and Control Time Delay Systems: Robust Control Delays in Interconnected Systems Robust Time-Delay Systems I-II Delays, feedback and interconnections: From simple structures Organizers: S.-I. Niculescu & J. Cheong Speakers:
Keqin GU, Wim MICHIELS, Antonis PAPACHRISTODOULOU, Frederic MAZENC, |
||||||||||||||||||||||||||||||||||||||||||||||
Fifth World Congress of Nonlinear Analysts Orlando, FL, USA, July 2-9, 2008 http://research.fit.edu/ifna/wcna2008/ Sessions titles related to time delay system: Stochastic delay systems: stability, numerics and applications, Organizers: Xuerong Mao UK, Jiang Lun Wu UK Theory and applications of delay differential and difference equations, Organizers: Ferenc Hartung Hungary, Istvan Gyori Hungary Functional Differential Equations: Theory, Methods, Applications, Organizers: Elena Braverman Canada, Josef Diblik Czech Republic, Alexander Domoshnitsky Israel |
||||||||||||||||||||||||||||||||||||||||||||||
American Institute of Mathematical Sciences Arlington Texas USA, May 18 - 21, 2008 http://aimsciences.org/AIMS-Conference/2008/index.htm Special session: Delay Differential Equations (with 16 speakers) Organizer: Tibor Krisztin Contributed session: Delay and Difference Equations |
||||||||||||||||||||||||||||||||||||||||||||||
ICNPAA 2008: Mathematical Problems in Engineering, Aerospace and Sciences Genoa, Italy, June 25- Friday June 27, 2008, http://www.icnpaa.com/index.htm Special session: Computational Methods for Nonlinear and Time-Delayed Systems with Applications |
||||||||||||||||||||||||||||||||||||||||||||||
|
Theses Modeling, control design and development of internet based interface for remote control of experimental heat transfer set-up Abstract: Both theses, which have been defended at the Dept. of Instrumentation and Control Engineering, CTU in Prague deal with the experimental heat transfer set-up which has been developed at the Centre for Applied Cybernetics, CTU in Prague to test time-delay system based approaches to modeling and control design. The set-up consists of two closed piping circuits, with water as the heat transfer medium. The circuits are equipped with heaters, coolers, pumps, mixing valves, and a multi-plate heat exchanger. For measuring and control purposes, either PC with data acquisition cards and Matlab environment or industrial PLC can be used. Both theses were supported by the Ministry of Education of the Czech Republic under the Project 1M0567. Thesis 1: Pole placement based control design of experimental heat transfer set-up The first task solved in the thesis is to develop a model of the experimental heat transfer set-up. The linear model, which consists of ten functional differential equations describes the dynamics of the system in a vicinity of a selected operational point. All the state variables of the model represent temperatures measured at different places of the set-up. The model has four inputs which control the performance of the heaters and coolers respectively. The second, main task solved in the thesis is the control design of static gain coefficient feedback from the state variables by pole placement approaches. First the control design is solved as a SISO problem (a single system input is used for the control purpose and a single temperature is controlled) using both direct pole placement and continuous pole placement methods. Then the continuous pole placement method is used to design the feedback gains for DIDO problem (two system inputs are used for the control purpose and two temperatures are controlled). The resulting feedback controllers were successfully tested on the model as well as on the set-up. The control algorithms were implemented on both PC with Matlab and industrial PLC. More detailed description of the results can be found at http://www.cak.fs.cvut.cz/dipl/paulu.html. Thesis 2: Internet based remote access to measurements and control of experimental heat transfer set-up The thesis deals with a design and implementation of a web interface for a remote control of the experimental set-up. The implementation of the remote access is worked out in three application levels. The bottom level is implemented in a Matlab-Simulink program on a PC with data acquisition cards. The program is responsible for processing the temperature measurements and performing the control of the set-up actuators. The second application level consists in a control program, in which control algorithms (manual, PID and static gain state feedback) are implemented. This program also accomplishes a communication with both the bottom and the top application levels. The top level consists in the web interface from which it is possible to perform the experiments on the set-up via the remote internet based access. On the web pages, a detailed description of the set-up and its mathematical model can also be found. The web interface also allows performing the synthesis of the controllers based on a direct pole-placement method. The web interface can be accessed at http://www.cak.fs.cvut.cz/remote/menuen.html, and after authorization by a security password, the remote measurements and control of the set-up can be accomplished. |
Prepared by Rifat Sipahi, April 2008.