Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New methodology to design complete mould QFT multivariable controllers

25.10.2002


This project has been proposed in the doctoral thesis of professor Igor Egaña Santamarina of the Public University of Navarre, called “Design of complete mould QFT multivariable controllers”. Professor Mario Garcia Sanz, from the Department of Automation and Computer Science of the Public University of Navarre, has supervised the project.

Air traffic controllers and wind generator controllers

Control engineering involves the design of mathematical laws that modify the way in which industrial processes progress. That way, for example, when the way in which warming power affects the temperature of the oven is established, it is possible to determine how power must be modified so that opening and closing of the door produces a minimum effect in the inner temperature. But control engineering is present in many other industrial processes. For example, when the ABS reduces the braking of a car to avoid the blocking of wheels, or in case of an electronic circuit that tunes the exact frequency of a digital radio.



The doctoral thesis is set within the Quantitative Feedback Theory (QFT), whose development started at the end of the 50s under the supervision of professor Horowitz. Since then, some of the technical applications based on QFT are air traffic controllers of the most modern airplanes, monitoring systems of high precision satellites, sewage treatment plants or robotic. Similarly, in Navarre, Mario Garcia Sanz –director of this thesis- applies at the present this technology in the design of control systems of a wind generator of 1,5 MW for the company M. Torres Diseños Induatriales S.A.

More efficient way to reduce “coupling”

The doctoral thesis of Igor Egaña has been focused on the study of multivariable systems, that is, with multiple entries that affect multiple outputs. According to professor Egaña, the main characteristic of this kind of processes is that when measuring an error in an output and trying to reduce it acting one of the inputs, causes a failure in various outputs. That is known as the coupling effect between the links. In that sense, the thesis defends a more efficient way to reduce those interactions between links.

As a consequence of the theoretical study, it has been analysed the inclusion of some elements of the controller that usually are not considered in multivariable processes: the elements located outside the main diagonal of the controller.

To verify the validity of those theoretical results, the methodology has been applied in two different processes. On the one side, the introduction of a controller in an industrial robot of the type SCARA has proved the viability of the technical proposal. On the other side, the design of the control algorithm for the heat exchanger of a milk pasteurisation plant, which according to professor Egaña is a process with more complex characteristics from the control point of view, has strengthened the applicability of the new contribution made by this doctoral thesis.

Garazi Andonegi | alfa
Further information:
http://www.basqueresearch.com/index.asp?Gelaxka=1&hizk=I

More articles from Process Engineering:

nachricht New technology for ultra-smooth polymer films
28.06.2018 | Fraunhofer-Institut für Organische Elektronik, Elektronenstrahl- und Plasmatechnik FEP

nachricht Diamond watch components
18.06.2018 | Schweizerischer Nationalfonds SNF

All articles from Process Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Scientists present new observations to understand the phase transition in quantum chromodynamics

The building blocks of matter in our universe were formed in the first 10 microseconds of its existence, according to the currently accepted scientific picture. After the Big Bang about 13.7 billion years ago, matter consisted mainly of quarks and gluons, two types of elementary particles whose interactions are governed by quantum chromodynamics (QCD), the theory of strong interaction. In the early universe, these particles moved (nearly) freely in a quark-gluon plasma.

This is a joint press release of University Muenster and Heidelberg as well as the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt.

Then, in a phase transition, they combined and formed hadrons, among them the building blocks of atomic nuclei, protons and neutrons. In the current issue of...

Im Focus: Patented nanostructure for solar cells: Rough optics, smooth surface

Thin-film solar cells made of crystalline silicon are inexpensive and achieve efficiencies of a good 14 percent. However, they could do even better if their shiny surfaces reflected less light. A team led by Prof. Christiane Becker from the Helmholtz-Zentrum Berlin (HZB) has now patented a sophisticated new solution to this problem.

"It is not enough simply to bring more light into the cell," says Christiane Becker. Such surface structures can even ultimately reduce the efficiency by...

Im Focus: New soft coral species discovered in Panama

A study in the journal Bulletin of Marine Science describes a new, blood-red species of octocoral found in Panama. The species in the genus Thesea was discovered in the threatened low-light reef environment on Hannibal Bank, 60 kilometers off mainland Pacific Panama, by researchers at the Smithsonian Tropical Research Institute in Panama (STRI) and the Centro de Investigación en Ciencias del Mar y Limnología (CIMAR) at the University of Costa Rica.

Scientists established the new species, Thesea dalioi, by comparing its physical traits, such as branch thickness and the bright red colony color, with the...

Im Focus: New devices based on rust could reduce excess heat in computers

Physicists explore long-distance information transmission in antiferromagnetic iron oxide

Scientists have succeeded in observing the first long-distance transfer of information in a magnetic group of materials known as antiferromagnets.

Im Focus: Finding Nemo's genes

An international team of researchers has mapped Nemo's genome

An international team of researchers has mapped Nemo's genome, providing the research community with an invaluable resource to decode the response of fish to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

One of the world’s most prominent strategic forums for global health held in Berlin in October 2018

03.09.2018 | Event News

4th Intelligent Materials - European Symposium on Intelligent Materials

27.08.2018 | Event News

LaserForum 2018 deals with 3D production of components

17.08.2018 | Event News

 
Latest News

Fraunhofer ISE with over 60 Contributions at the European PV Solar Energy Conference and Exhibition

21.09.2018 | Trade Fair News

558 million-year-old fat reveals earliest known animal

21.09.2018 | Earth Sciences

Neutrons produce first direct 3D maps of water during cell membrane fusion

21.09.2018 | Health and Medicine

VideoLinks
Science & Research
Overview of more VideoLinks >>>