151 research outputs found
A hybrid MPC-PI control system for fire tube steam generators
No full textLAUREA MAGISTRALEA differenza del passato, oggigiorno, le aziende manifatturiere si sforzano sempre di più di personalizzare i propri prodotti. In particolare, per modelli di caldaie industriali a tubi di fumo, sono interessate a migliorare l'efficienza e ridurre i consumi e le emissioni di ossidi di carbonio e azoto. Ecco perché la modellazione dinamica delle caldaie a tubi di fumo è un argomento importante oggi.
Nelle caldaie a tubi di fumo, i gas combusti passano all'interno di tubi immersi in acqua. Viene scambiato calore con le pareti dei tubi e quindi con l’acqua circostante. Come risultato di questo processo, c'è una produzione di vapore che viene utilizzata in una varietà di applicazioni industriali. Un modello dinamico implementato in MATLAB è stato utilizzato per l'analisi delle prestazioni della caldaia.
In questa tesi è stata proposta un'architettura di controllo di un generatore di vapore a tubi di fumo. Finora, sono stati tradizionalmente usati due anelli di controllo: uno per la pressione e uno per il livello. In questa tesi, le prestazioni del sistema sono state migliorate senza modificare la sua architettura di base sovrapponendo un'architettura Model Predictive Control (MPC) a quella tradizionale (un approccio ibrido MPC-PID). Il lavoro è stato incentrato sul controllo dinamico dei setpoint dei regolatori PID con l'obiettivo di aumentare l'efficienza e superare il cosiddetto fenomeno del rigongiamento (shrink-swell).
Il caso di studio è un generatore di vapore a tubi di fumo prodotto da Bono Energia S.p.A., modello: SG-1000.Differently from the past, nowadays, manufacturing companies increasingly strive to customize fire tube boiler designs to specific model. They are interested in enhancing efficiency and reducing consumptions and carbon/nitrogen oxides emissions. That’s why dynamic modelling of fire tube boilers is an important topic today.
In fire tube boilers, the flue gas passes inside water immersed tubes, and heat is transferred to the water on the shell side. As a result of this process, there is a production of steam that is being used in applications of a variety of industrial fields. A dynamic model implemented in MATLAB has been used for the analysis of boiler performance.
In this thesis, a control architecture of a fire tube steam generator has been proposed. Two control loops have traditionally been used: pressure control loop and level control loop. In this thesis, the system performance is enhanced without changing its core architecture by applying a Model Predictive Control (MPC) architecture on top of the traditional one (an hybrid MPC-PID approach). The work has been focused on controlling the setpoints of the PID regulators with the goal of increasing efficiency and overcome the so called shrink-swell phenomenon.
The case study is a fire tube steam generator produced by Bono Energia S.p.A., model: SG-1000
Cooperative dancing with an industrial manipulator: Computational cybernetics complexities
No full textTural, Kübra (Dogus Author) -- Tükel, Dilek Bilgin (Dogus Author) -- Conference full title: 2016 IEEE International Conference on Systems, Man, and Cybernetics, SMC 2016; Budapest; Hungary; 9 October 2016 through 12 October 2016.Synchronization of music and dance of industrial manipulators is studied, simulated and realized. The results are shown in this paper. To formulate the dance, a modified Labanotation software has been developed, and a user-friendly human-machine interface is designed to enable the user to program the robot easily. The system is incorporated with a music analyzer, employing Fast Fourier Transform, to track the beats. The robot dances in synchrony with the input from the music analyzer. Experiments are done on a six degree-of-freedom industrial robot
Two-way coupled aerodynamics and vehicle dynamics simulations of a heavy ground vehicle subjected to crosswind of various frequencies
No full textThe present study investigates the dynamic characteristics of a heavy ground vehicle subjected to crosswind with various frequencies using two-way coupled simulations between aerodynamics and vehicle dynamics, including the driver's steering inputs. Four different reduced frequencies of crosswind, which are equal to 4.2, 2.1, 1.3 and 0.9, are used. The results show that the absolute maximum magnitudes of the vehicle's lateral dynamic and aerodynamic characteristics increase inversely proportional with the reduced frequencies of crosswinds without the driver's steering input. However, when the driver's steering input is included in the vehicle's response to the crosswind disturbances, the vehicle's lateral dynamic characteristics increase by the largest amount for reduced frequencies of 1.3 and 2.1. Furthermore, for a reduced frequency of 0.9, the driver's steering inputs attenuate the unfavourable amplifications in the vehicle's lateral dynamic characteristics. In the present study, the reasons for the increase in the vehicle's lateral dynamic characteristics in the cases of reduced frequencies equal or greater than 1.3 with the driver's steering input are explained. Additionally, the results show that the vehicle is not controlled within the 0.5 m lateral margins of the road when the steering starts with a time delay of 1.0 s for reduced frequencies equal to or lower than 2.1.Swedish Innovation Agency Vinnova [2017-03391]; Centre for ECO2 Vehicle Design at KTH (Vinnova) [2016-05195]; Vinnova [2017-03391] Funding Source: Vinnova; Swedish Research Council [2016-05195] Funding Source: Swedish Research CouncilThe author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The author would like to gratefully acknowledge the co-funding he has received for this work from the Swedish Innovation Agency Vinnova (grant number 2017-03391) and the Centre for ECO2 Vehicle Design at KTH (itself funded by Vinnova grant number 2016-05195)
Множественная роль инфраструктуры железнодорожных станции – просмотр на трех концепциях (Multiple role of railway stations infrastructure - view on three concepts)
No full textDue to the growth of the urban population in the world, the fact of densification in cities has increased. As a result of this reality, the issue of lack of physical space in cities emerges. In this sense, the author highlight the importance of sustainable and multifunctional use of the city infrastructure, especially of the railway stations. The author mentioned three practical examples in different French cities: The Saint-Lazare railway station in Paris as an example of “Shopping centre and Railway station” concept, the Strasbourg's Railway station “Environment and Railway station”, Lyon's railway station Part Dieu and Geneva's Railway station “Cornavin” as an example of the concept “Intermodal Hub and Railway station”
Agricultural technology adoption by rural farmers in Malawi: A case study of a Small Enterprise in Malawi
No full textThe implementation of new agricultural technologies is considered a key component of Malawi’s agricul- tural development strategy. However, successful technology adoption has proven to be difficult, affecting both farmers and small businesses introducing the technology. With a primary focus on farmers interested in adopting the technology, common factors influencing farmers’ adoption habits are determined by con- ducting interviews and observations. Survey results indicate that from a farmers perspective; market ac- cess, information access, education, and affordability are key factors helping facilitate adoption, while lack of these factors hinder adoption. Insight into these factors could provide business knowledge on how to better facilitate technology adoption. For this purpose, literature factors affecting a SME’s success are compared with an active agricultural technology company. These factors include experience, communication, man- agement and technology performance. Using both farmers needs and business developmental factors, this study hopes to provide insights for new companies starting a business in a developing country.Multidiciplinairy projec
Separation and preconcentration of boron with a glucamine modified novel magnetic sorbent
No full textA novel, simple method based on magnetic separation was developed for analytical purposes. In this method, N-methyl-D-glucamine (NMDG) modified magnetic micro-particles that were synthesized by using the sol-gel method were used for the selective extraction and preconcentration of boron from aqueous solutions. This method combines the simplicity and selectivity of solvent extraction with the easy separation of magnetic microparticles from a solution with a magnet without any preliminary filtration step. The structure of the prepared gamma-Fe2O3-SiO2-NMDG (magnetic sorbent) composites were characterized by using X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), and Fourier Transform Infrared Spectroscopy (FTIR). The influence of different parameters on the sorbent capacity, such as the sorption/desorption of boron, magnetic sorbent dosage, pH, equilibrium time, type, and amount of stripping solution, were evaluated by using the magnetic sorbent. Any equilibrium pH greater than 6 can be used for sorption. Desorption from the sorbent was carried out by using 1.0 M HCl. The sorption and desorption efficiency of the gamma-Fe2O3-SiO2-NMDG was found as 92.5 +/- 0.5% and 99.8 +/- 6%, respectively.Dicle University Research Fund [08-EF-55]The author is grateful to Prof. Dr. Murvet Volkan, for her support in preparing the gamma-Fe2O3-silica particles, during postdoctoral studies in her laboratory at the Middle East Tecnical University, Ankara. This work was also partially supported by the Dicle University Research Fund (Project No. 08-EF-55)
Empirical Modelling of Inter-organizational Knowledge Collaboration
No full textOpen innovation, knowledge co-creation, and research joint ven-tures, unified under the term 'inter-organizational knowledge collaboration', are discussed in various fields of innovation man-agement to ultimately shape inno-vation strategy of the organiza-tions and the innovation policy. Several ongoing debates are crucial in the allocation of resources and division of labor with regards to the innovation system: industries vs. universities, who are the salient actors of the innovation system? Death of distance vs. geographical boundedness, does distance mat-ter? Network cohesion vs. struc-tural holes, where in the network is more fertile for innovation? This book, discussing these de-bates, intends to direct the innovation strategy and policy.<br/
Bigamy in the Polish Criminal Law
No full textBigamy is a crime threatening the regularity of family functioning, whose basis, due to the cul-tural tradition and Polish law, makes monogamy marriage. In his article the author presents the origin of the bigamy crime and its statutory hallmarks. It is shown who, in what circumstances, and with fulfilling which conditions, can commit bigamy crime, as well as the statistic depiction of the crime has been presented
Stereotype und Vorurteile im Fremdsprachenunterricht - sollte man sie bekämpfen, akzeptieren oder relativieren?
No full textThe author of the article touches upon an extremely important concept of national tereotype. The import of the issue incrosses when it comes to countries with tragic past, like Germany and Poland. The presentation includes features of stereotype as opposed to Fremdbild, as well as the concept of prejudice. The conclusion introduces a suggestion to contuct intercul-tural trainig together with the popularisation of issues related to stereotype, and challenging the stereotype through everyday contacts with other ethnic groups
Synthesis and Characterization of New Branched Magnetic Nanocomposite for Loading and Release of Topotecan Anti-Cancer Drug
No full textThe purpose of this study is to synthesize the new branched magnetic nanocomposite to carry the therapeutic agents and bio-macromolecules. Although topotecan (TPT) has significant antitumor activity to lung, ovarian, breast, pancreas, and stomach cancers, lactone ring opening causes a reduction in cytotoxic activity and severe side effects in physiological conditions. In order to contribute to the removal of the handicap (lactone ring opening), magnetic dextran branched with NαNα-Bis (carboxymethyl)-l-lysine hydrate (NTA) nanoparticles (MD3) were prepared. The characterization of the resulting MD3 material was done by using multi-pronged analyses. The stability and release of TPT with synthesized and characterized new material of the MD3 was studied using various essential factors like concentration, dosage, pH, and time. The entrapment efficiency and loading capacity of TPT onto MD3 was calculated as 32.2% and 1.44 mg/g, respectively, at pH 5. Release studies were performed with drug-loaded MD3 at different pH values. It was seen that the best release was obtained at the cancerous site pH. Initial drug concentration was measured as 0.118 mM. The loaded drug concentration was calculated as 0.0380 mM at pH 5 and 0.00092 mM of drug was released after 90 min at pH 5.8. Percentage released of drug was found as 2.42% during 90 min. [Figure not available: see fulltext.]. © 2019, The Author(s).TUBITAK; [Türkiye Bilimsel ve Teknolojik Araştirma Kurumu, TÜBITAK; [Dicle Üniversitesi, (116Z778, ZGEF.16.008
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