Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Design of controllers

28.10.2005


In her PhD thesis at the Public University of Navarre, Industrial Engineer Marta Barreras Carracedo put forward a new method of designing controllers based on QFT (Quantitative Feedback Theory) and which facilitates its real implantation in the government of real physical processes. The thesis itself validates the method putting into practice two concrete cases, an industrial electric furnace used for the drying of large pieces of composite and a heat exchanger in a solar water-heating plant.

The PhD is entitled: “Multivariable QFT Robust Control by means of non-diagonal sequential methods. Its application to the government of thermal processes".

Development of sophisticated industrial processes



Over the last decades, the rapid advance of technology and the appearance of increasingly more powerful computers have favoured the development of industrial processes that are more and more sophisticated. These processes include, in general, an ever higher level of automation the aim of which is the enhancement of characteristics and performance. Nevertheless, this brings with it a growing complexity in installations that have accelerated demand for new, advanced control strategies capable of covering new needs.

In this respect, Control Engineering plays a fundamental role within modern industrial processes. Marta Barreras’s PhD was aimed at developing a new advanced strategy for the design of controllers of multiple sensor systems and actuators, of a robust nature and with a capacity for internal decoupling and rejection of external perturbations. Moreover, the system has to be sufficiently simple in order to facilitate its implantation into real industrial processes.

To this end, the research work used the Quantitative Feedback Theory, given its capacity to deal with the uncertainty of the system and the existing external perturbations. This theory is based on the use of non-diagonal elements of the controller to deal simultaneously with problems such as coupling reduction and rejection of external perturbations.

Validation with two real processes

After a theoretical analysis, the results were validated in two distinct stages. First through the resolution of a theoretical example and, secondly, by means of its application in two real processes.

Marta Barreras chose an industrial electric furnace used for the baking of large pieces of composite and a heat exchanger located in a solar water-heating plant.

On the one hand, the high multiplicity of actuators and sensors present in the industrial electric furnace means that its operation is of a high multivariable character. Thus, on governing automatically its thermal and dynamic behaviour, there arise significant problems of coupling between existing control loops.

On the other hand, the interaction existing between two loops of a heat exchanger, as with the existence of uncertainty in the model and presence of external perturbations, make this application another good example for valilidating the multivariable QFT strategy.

Marta Barreras points out that, amongst the advantages of the technique applied in these two cases is the act that it manages to enhance the general response of the system to be controlled. Specifically, the rejection of external perturbations was augmented and we managed to reduce the effect of coupling between the loops of the system.

Garazi Andonegi | alfa
Further information:
http://www.basqueresearch.com

More articles from Power and Electrical Engineering:

nachricht Silicon solar cell of ISFH yields 25% efficiency with passivating POLO contacts
08.12.2016 | Institut für Solarenergieforschung GmbH

nachricht Robot on demand: Mobile machining of aircraft components with high precision
06.12.2016 | Fraunhofer IFAM

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

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

Im Focus: Electron highway inside crystal

Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.

Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Researchers identify potentially druggable mutant p53 proteins that promote cancer growth

09.12.2016 | Life Sciences

Scientists produce a new roadmap for guiding development & conservation in the Amazon

09.12.2016 | Ecology, The Environment and Conservation

Satellites, airport visibility readings shed light on troops' exposure to air pollution

09.12.2016 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>