07 Fakultät Konstruktions-, Produktions- und Fahrzeugtechnik
Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/8
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Item Open Access Multivariable controller design for an industrial distillation column(1992) Allgöwer, Frank; Raisch, JörgIn this paper, we report our experience with the design of linear multivariable controllers for a staged binary distillation column with 40 trays. Controller design methods include H∞-minimization, DNA-design, CL-design and H2minimization. Results obtained at the real plant are shown.Item Open Access Chemical process control: a german perspective(1992) Allgöwer, FrankThis paper focuses on developments in controller design that we think can have a significant impact on the solution of practical process control problems, and try to summarize the discussion in Germany on this subject.Item Open Access Nonlinear control of an industrial distillation column by exact linearization(1989) Allgöwer, Frank; Sax, Antonius; Gilles, Ernst Dieter-Item Open Access Nichtlinearer Reglerentwurf auf der Grundlage exakter Linearisierungstechniken(1993) Allgöwer, Frank; Gilles, Ernst DieterDem nichtlinearen Reglerentwurf mittels exakter Linearisierung liegt eine Zweischritt-Philosophie zugrunde: zuerst wird die nichtlineare Regelstrecke durch eine nichtlineare Rückführung exakt in ein lineares System überführt. Das exakt linearisierte System kann im zweiten Schritt mit linearen Reglerentwurfsverfahren so geregelt werden, daß Stabilität und gutes Regelverhalten erreicht werden. In diesem Übersichtsbeitrag wird eine Einführung und ein Überblick über das Gebiet der exakten Linearisierung gegeben. Anhand von Beispielen werden die Vorteile und Grenzen der Verfahren diskutiert.Item Open Access Chemical process control : present status and future needs ; the view from European industry(1991) Schuler, Hans; Allgöwer, Frank; Gilles, Ernst DieterNot only in Europe, chemical process control is characterized by a broad invasion of distributed control systems into chemical plants. The information integration from process control up to business management is a great challenge of today which follows from the overall computerization of production. Most of the recent progress in process automation results from the application of computer science paradigms to control systems, and of advanced developments in field instrumentation. Despite these advances and the considerable progress made in process control theory, there is only limited acceptance and application of modern advanced process control methodologies in industrial practice. This paper is an attempt to summarize the European discussion on the reasons for these facts.Item Open Access Influence of the wall on the dynamic behavior of homogeneous tubular reactors with a highly exothermic reaction(1974) Eigenberger, GerhartThe influence of the tube wall on the behavior of tubular reactors with a highly exothermic reaction was studied. The effect of heat accumulation in the wall has a considerable influence upon the transient behavior of the reactor. Because of this influence excess temperatures can occur if the feed temperature is lowered or the flow velocity is raised. For a gas phase reaction the transient behavior is determined almost completely by the heat capacity of the wall. An example of multiple steady states caused by axial heat conduction in the wall is given, and the influence of heat conduction in the wall is compared with that in the reaction mixture.Item Open Access A distributed solution to the adjustable robust economic dispatch problem(2013) Lorenzen, Matthias; Bürger, Mathias; Notarstefano, Giuseppe; Allgöwer, FrankThe problem of maintaining balance between consumption and production of electric energy in the presence of a high share of intermittent power sources in a transmission grid is addressed. A distributed, asynchronous optimization algorithm, based on the ideas of cutting-plane approximations and adjustable robust counterparts, is presented to compute economically optimal adjustable dispatch strategies. These strategies guarantee satisfaction of the power balancing constraint as well as of the operational constraints for all possible realizations of the uncertain power generation or demand. The communication and computational effort of the proposed distributed algorithm increases for each computational unit only slowly with the number of participants, making it well suited for large scale networks. A distributed implementation of the algorithm and a numerical study are presented, which show the performance in asynchronous networks and its robustness against packet loss.Item Open Access Kinetic instabilities in catalytic reactions : a modelling approach(1976) Eigenberger, GerhartIt is the purpose of this contribution to show under which conditions relatively simple Langmuir-type rate mechanisms exhibit steady state multiplicity as well as periodic instabilities and may serve as models for experimentally observed phenomena.Item Open Access Nonlinear control of high purity distillation columns(1994) Groebel, Markus; Allgöwer, Frank; Storz, Markus; Gilles, Ernst DieterTwo simple models of distillation columns are studied to investigate their suitability for the practical use with exact I/O-linearization. An extension of exact I/O-linearization, the asymptotically exact I/O-linearization is applied to the control of a high purity distillation column, using one of these models to derive the static state feedback law. Simulation studies demonstrate the advantage of asymptotically exact I/O-linearization versus classical exact I/O-linearization techniques. Experimental results show the excellent performance of asymptotically exact I/O-linearization using a simple distillation model.Item Open Access Dynamische Simulation verfahrenstechnischer Prozesse und Anlagen : ein Vergleich von Werkzeugen(1994) Watzdorf, Rüdiger von; Allgöwer, Frank; Helget, Andreas; Marquardt, Wolfgang; Gilles, Ernst DieterZusammenfassend zeigen unsere Erfahrungen, daß sich prinzipiell alle betrachteten Werkzeuge zur Simulation verfahrenstechnischer Prozesse und Anlagen eignen. Die Werkzeuge zeichnen sich allerdings durch eine unterschiedliche Zielrichtung aus: SlMULINK bietet einen sehr hohen Modellimplementierungs-, Verschaltungs- und Bedienkomfort; ACSL und SPEEDUP sind für die Modellierung und Implementierung neuer Modelle besonders geeignet, wobei SPEEDUP speziell die Bedürfnisse der Verfahrenstechnik unterstützt; DIVA ist weniger auf den Modellierer und mehr auf den Anwender ausgerichtet, der aus vorhandenen Bibliotheken Modelle auswählt, parametriert und verschaltet.