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作者： Ruiz, Magda Villez, Kris Sin, Gurkan Colomer, Joan Vanrrolleghem, Peter Control Engineering and Intelligent Systems Group -eXiT Department of Electronics Computer Science and Automatic Control University of Girona CP 17071 Girona Spain Department of Applied Mathematics Biometrics and Process Control Ghent University Coupure Links 653 B-9000 Ghent Belgium

ISBN: (纸本)9783902661142

The data set of batch biological and biotechnological processes can be organized in a three-way data matrix. In this paper the usefulness of different PCA approaches for monitoring is analyzed. Different ways of unfolding and scaling of data have been applied to a pilot-scale SBR data. PCA is used to reduce the dimensionality and to remove the non-linearity dynamic of the data. Moreover, a new method to select the number of principal components is proposed. Loadings graphics are used to determinate the predominant variables for each one. The results show that whatever model can be applied depending on the goal of the monitoring, however the models implicate possible false alarms or faults omission. Copyright © 2006 IFAC.

关键词： process monitoring

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App-based system diagnosis using mobile information systems

App-based system diagnosis using mobile information systems

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Jens Ziegler Leon Urbas Henning Lenz Hermann Richter Chair of Process Control Systems Engineering Technische Universität Dresden Industry Sector Siemens AG Karlsruhe

This paper presents a study of the potential of integrated services for app-based system diagnosis using mobile information systems. First, a task and context analysis is provided for the application of integrated system diagnosis in the context of plant asset management (PAM). Second, exemplary scenarios are presented which demonstrate IT services for system analysis based on self-organizing maps, system diagnosis with a graph-based approach and support for therapeutic measures on defective assets. Third, a mobile information system is presented that allows users to list, describe, filter, and select assets, to browse through available diagnoses, and to follow step-by-step instructions for recommended therapeutic measures. The mobile information system provides a graphical representation, description, and selection of assets by using a P&I diagram as well as a chart visualization of process values. The system further provides access to both static and transient data sources such as engineering data of the plant, process data of the technical process and the results of complex analysis services. This mobile information system demonstrates the suitability of the proposed app-based approach. Finally, the results of a focus group workshop are summarized, showing the potential of mobile information systems in an industrial setting, barriers that still remain.

关键词： Mobile communication Information systems Medical treatment Monitoring Maintenance engineering Industries Context

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Hard Real-Time Capable OPC UA Server as Hardware Peripheral for Single Chip IoT systems

Hard Real-Time Capable OPC UA Server as Hardware Peripheral ...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Chris Paul Iatrou Heiner Bauer Markus Graube Sebastian Höppner Julian Rahm Leon Urbas Chair of Process Control & Systems Engineering Technische Universität Dresden Chair of Highly-Parallel VLSI Systems and Neuro-Microelectronics Technische Universität Dresden

The fast semantics project examines the use of the OPC Unified Architecture (OPC UA) in embedded industrial systems and proposes the design of a customizable, hard real time capable OPC UA Intellectual Property Core (IP Core) for single chip computing plattforms. This allows using OPC UA in both novel energy efficient sensor applications and in state of the art field devices. These single chip OPC UA servers form the semantic data sources for future applications such as cloud based added value services or machine learning applications. This article presents the design alternatives and first synthesis results for the implementation of OPC UA servers in embedded systems.

关键词： Random access memory IP networks Protocols Semantics Servers process control Real-time systems

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Computing realizations of reaction kinetic networks with given properties

Computing realizations of reaction kinetic networks with giv...

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International Research Workshop: Coping with Complexity: Model Reduction and Data Analysis

作者： Szederkényi, Gábor Hangos, Katalin M. Csercsik, Dávid Process Control Research Group Computer and Automation Research Institute Hungarian Academy of Sciences Budapest 1518 Hungary Department of Electrical Engineering and Information Systems University of Pannonia Egyetem u. 10 Veszprém 8200 Hungary

ISBN: (纸本)9783642149405

The solution to the problem of finding the reaction kinetic realization of a given system obeying the mass action law containing the minimal/maximal number of reactions and complexes is shown in this paper. The proposed methods are based on Mixed Integer Linear Programming where the mass action kinetics is encoded into the linear constraints. Although the problems are NP-hard in the current setting, the developed algorithms give a usable answer to some of the questions first raised in [1].

关键词： Reaction kinetics

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Globally stabilizing state feedback control design for Lotka-Volterra systems based on underlying linear dynamics

Globally stabilizing state feedback control design for Lotka...

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作者： Magyar, Attila Hangos, Katalin M. Department of Electrical Engineering and Information Systems University of Pannonia Egyetem street 10. Veszprém H-8200 Hungary Process Control Research Group Control and Automation Research Institute HAS Kende street 13-17 BudapestH-1111 Hungary

Using translated X-factorable phase space transformations and nonlinear variable transformations a dynamically similar linear ODE model is associated to the Lotka-Volterra system models with a positive equilibrium point. This enables to use a linear full state feedback controller to stabilize the system in controllable cases, that leaves the open loop equilibrium point unchanged. The linear state feedback controller design problem in the general case has also been formulated to ensure the compartmental property of the closed loop system from which the existence of a diagonal Lyapunov function follows. Further extension has been obtained by using the time re-parametrization transformation defined for quasi-polynomial models. © 2015

关键词： Closed loop systems

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Indistinguishability analysis and observer design for size-structured cell populations

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IFAC-PapersOnLine 2023年第2期56卷 581-586页

作者： P. Jerono J.J. Winkin A. Vande Wouwer A. Schaum Digital Process Engineering Group (DPE) Karlsruhe Institute of Technology Germany Department of Mathematics and Institute for Complex Systems (naXys) University of Namur Belgium Systems Estimation Control and Optimization (SECO) University of Mons Belgium Chair of Automation and Control (ACON) Kiel University Germany

The observability property of population balance equations with biomass measurements is addressed within the framework of indistinguishable trajectories. The population balance equation is described by a partial integro-differential equation which is coupled with an ordinary differential equation for the nutrient dynamics. For the semi-discretized model equations, the dynamics of indistinguishable trajectories are derived and evaluated for the special case of equal partitioning at cell division revealing that the observability property is guaranteed as long as the nutrient concentration is not depleted. Based on these results, an observer is designed and tested in simulation to estimate the cell population distribution using biomass measurements in a batch bioreactor for the case of a bi-structured population.

关键词： Observability indistinguishable trajectories cell population dynamics

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Triangular Fuzzy Number Representation of Relations in Fuzzy Cognitive Maps

Triangular Fuzzy Number Representation of Relations in Fuzzy...

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IEEE International Conference on Fuzzy systems

作者： Engin Yesil M. Furkan Dodurka Leon Urbas Control and Automation Engineering Department Istanbul Technical University Istanbul Turkey Chair of Process Control Systems Engineering Technology University of Dresden Germany

In this paper, the conventional Fuzzy Cognitive Maps (FCMs), which has already achieved success in many fields, are extended by using triangular fuzzy numbers (TFNs). The advantage of FCMs is that they are relatively easy to construct and parameterize and are capable of handling the full range of system feedback structure, including density-dependent effects. However, it is a well-known fact that there are some limitations inherent in FCM, such as lack of adequate capability to handle uncertain information and lack of enough ability to aggregate the information from different sources. Triangular fuzzy numbers which are represented by a triplet has the capacity to represent the uncertain relations between the concepts. In this context, the weight matrix representing the causal relations are enhanced to a fuzzy weight matrix that has TFNs as element. As a result of this improvement, the dynamic reasoning algorithm of the conventional FCM is improved for the use of the proposed novel FCM. The proposed FCM is presented via four simulations and the results are discussed. The results of the simulation study shows how easily the uncertain information can be represented and interpreted by the proposed FCM design methodology.

关键词： Uncertainty Vectors Cognition Fuzzy sets Pragmatics Fuzzy cognitive maps Modeling

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On the geometry of equilibrium solutions of kinetic systems obeying the mass action law

On the geometry of equilibrium solutions of kinetic systems ...

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8th International Symposium on Advanced control of Chemical processes, ADCHEM 2012

作者： Alonso, Antonio A. Szederkényi, Gábor Process Engineering Group IIM-CSIC Spanish National Research Council C/Eduardo Cabello 6 36208 Vigo Spain Systems and Control Laboratory MTA SZTAKI Kende u. 13-17 H-1111 Budapest Hungary

ISBN: (纸本)9783902823052

In this contribution the problem relating dynamic behavior and parameter values for weakly reversible chemical reaction networks (CRNs) that obey the mass action law is revisited. The approach is founded on previous methods and results discussed in [15, 16] for weakly reversible CRNs. Two new research directions are however undertaken in this study, one of them exploits an alternative factorization of the Kernel of the Kirchhoff matrix Ak which in a natural way links complex balance with zero deficiency. The other one intends to use the convex structure of the so-called family of solutions described in [15] on the space of reaction channels. © 2012 IFAC.

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Closed-loop Scheduling in a canned food factory

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IFAC-PapersOnLine 2020年第2期53卷 10791-10796页

作者： C.G. Palacín C. Vilas A.A. Alonso José L. Pitarch C. de Prada Systems engineering and Automatic Control Dpt. University of Valladolid Valladolid Spain (Bio)Process engineering Group Instituto de Investigaciones Marinas (CSIC) Vigo Spain

This paper addresses the problem of closed-loop operation of scheduling, together with the interaction of control and scheduling, for a class of processes that appear very often in industry: those that combine continuous production lines with parallel batch units that share some resources. The paper presents a novel approach to this problem, including batching and a new type of precedence in the assignment problem. It also considers the effect of shared resources on the duration of the cycle time of the batch units. The approach is illustrated with a real-life example of a canned tuna factory

关键词： Integration of scheduling control shared resources tuna cans sterilisation process optimisation continuous-batch process scheduling

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Mass action realizations of reaction kinetic system models on various time scales

Mass action realizations of reaction kinetic system models o...

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作者： Hangos, K.M. Szederkényi, G. Process Control Research Group Computer and Automation Reseach Institute Kende u. 13-17 Budapest H-1111 Hungary Department of Electrical Engineering and Information Systems University of Pannonia Egyetem u. 10 Veszprém Hungary

Complex chemical reaction networks often exhibit different dynamic behaviour on different time scales. A combined approach is proposed in this work for determining physically meaningful mass action realizations of complex chemical reaction networks that describe its dynamic behaviour on different time scales. This is achieved by appropriately reducing the detailed overall mass action kinetic scheme using quasi steady state assumptions fit to the particular time scale, and then searching for an optimal realization using mixed integer linear programing. Furthermore, the relationship between the properties (reversibility, deficiency, stability) of the obtained realizations of the same system on different time scales are also investigated and related to the same properties of the detailed overall model. It is shown that the reduced models obtained by quasi steady state assumptions may show exotic nonlinear behaviour, such as oscillations, when the original detailed is globally asymptotically stable. The proposed methods are illustrated by using a simple Michaelis-Menten type reaction kinetic example. The simplified versions of the well known Brusselator model have also been investigated and presented as a case study. © Published under licence by IOP Publishing Ltd.

关键词： Reaction kinetics

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