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European control Conference

作者： Ruben Marti Sergio Lucia Daniel Sarabia Radoslav Paulen Sebastian Engell Cesar de Prada Department of Systems Engineering and Automatic Control University of Valladolid Process Dynamics and Operations Group Technische Universitt Dortmund Department of Electromechanical Engineering Escuela Politecnica Superior University of Burgos

ISBN: (纸本)9781467371605

This paper presents an algorithmic development in the framework of computationally efficient robust Non-linear Model Predictive control (NMPC) which deals with a parametric plant-model mismatch, where the description of the evolution of the uncertainty is done using a scenario tree, known as multi-stage approach. In order to reduce the computational time and memory requirements of the multistage NMPC, the calculations of the optimal control inputs can be done scenario-wise in parallel. These parallelized calculations must enforce the satisfaction of the non-anticipativity constraints, which is negotiated iteratively among the scenarios using Lagrangean or price-driven decomposition. The main challenge in using such scheme is the determination of the values of the aggregate variables that are used to coordinate the scenario-wise computations for convergence to the feasibility of the non-anticipativity constraints. The proposed approach uses parametric sensitivities of the optimal model states with respect to the control inputs which are used for the iterative determination of the values of aggregated variables. The proposed method achieves good performance and faster convergence compared to traditional decomposition schemes. The potential of the approach is demonstrated in simulation example of an hydrodesulphurisation unit.

关键词： control input Nonlinear predictive control nonlinear model predictive control distributed algorithms memory requirements Converge computational time Parametric

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Centralized robust multivariable controller design using optimization 19

Centralized robust multivariable controller design using opt...

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Taiwo, O. Adeyemo, S. Bamimore, A. King, R. Process Systems Engineering Laboratory Obafemi Awolowo University Ile-Ife Nigeria Measurement and Control Group Institute of Process and Plant Technology Technical University of Berlin Hardenberger Str. 36a D-1063 Germany

ISBN: (纸本)9783902823625

The paper deals with the determination of controller parameters for multivariable systems by means of parameter optimization. In order to reduce the computational burden, the starting point in the optimization is determined through information provided by the feedback controller parameterized using the multivariable internal model controller (IMC) computed from the plant's p/q moment approximant and the original plant's multi-loop controller parameter magnitudes. Thereafter, controller parameter optimization proceeds to completion using the MATLAB optimization toolbox which is widely available. A potency of this technique is that all performance specifications and stipulated constraints are easily accommodated in the problem formulation thus facilitating complete problem solution in one go. The technique has been found to be effective for all plants considered so far and generally produces closed loop systems with favorable characteristics when compared to systems designed by similar methods. © IFAC.

关键词： controllers

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On robust control system design for plants with recycle 19

On robust control system design for plants with recycle

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Taiwo, O. Bamimore, A. Adeyemo, S. King, R. Process Systems Engineering Laboratory Obafemi Awolowo University Ile-Ife Nigeria Measurement and Control Group Institute of Process and Plant Technology Technical University of Berlin Hardenberger Str. 36a D-1063 Germany

ISBN: (纸本)9783902823625

A direct procedure for deriving the component transfer functions in plants with recycle when mechanistic procedure is used in the mathematical modeling is demonstrated. Multi-loop feedback controllers are then designed for the plants with recycle incorporating recycle compensator and without recycle compensator using internal model control (IMC) parameterization. In general, it is found that controllers parameterized using the recycle compensated plant model result in closed-loop systems with better nominal and robust performance characteristics when implemented on the uncompensated plant model than when its controller is parameterized using the uncompensated plant model. Furthermore, recycle compensated plants result in overall best closed-loop systems when their feedback controllers are parameterized using the compensated plant model. © IFAC.

关键词： controllers

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Integrated Virtual Commissioning an essential Activity in the Automation engineering process: From virtual commissioning to simulation supported engineering

Integrated Virtual Commissioning an essential Activity in th...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Mathias Oppelt Leon Urbas Siemens AG Technische Universitat Dresden Chair of Process Control Systems Engineering

ISBN: (纸本)9781479940318

Production plants within manufacturing and process industries are becoming more and more complex systems. For a safe and demand sufficient production the automation system of a production plant is mission critical. Therefore the correct functioning and engineering of the automation system is essential. Nowadays the use of a virtual commissioning step before deploying the automation software on the real production plant is used more often. Within the virtual commissioning the automation software is tested against a virtual plant model, sufficient to check out the correct functioning of the automation system. Usually virtual commissioning is used as a step at the end of the automation engineering, as proposed by VDI 4499. Within this paper an integrated virtual commissioning is proposed, where the automation software is continuously tested against a virtual plant model during the overall engineering phase. The virtual plant is growing together with the automation software and thus enables simulation supported automation engineering. Benefits of the proposed workflow are that errors can be detected immediately after the implementation and the use of the virtual plant model could be extended to various stages of the engineering workflow.

关键词： Virtual commissioning Simulation Automation engineering Simulation supported testing

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Modular and active learning to support asynchronous learning in automation engineering

Modular and active learning to support asynchronous learning...

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International Conference on Information Technology Based Higher Education and Training, ITHET

作者： Annett Krause Leon Urbas Technische Universität Dresden Chair for Process Control Systems Engineering Dresden Germany

This paper discusses the application of modular and active learning concepts to courses in automation engineering for both vocational training and higher education. In the implemented concept, a course consists of several modular learning units that address different aspects of a single automation engineering process. To realize the complete cycle of activities every learning unit consists of a defined sequence of chapters, namely objectives, theoretical concepts, task definition, planning, and exemplary solution. The objective describes the contents so that the learner can decide if it matches his own objectives. Afterwards, theoretical concepts relevant to the objectives are presented to impart the basic knowledge. Now the definition of the tasks follows to realize the phase “recognition”. To combine the theory and the task the next part is planning to implement the phase “thinking”. Despite the fact that this phase is extremely important in the context of automation engineering, analysis of other course material and feedback from experienced trainers show that it is often skipped and is available only implicitly. By presenting one part of the solution the learner is led to a first solution. The presentation is done by structured step by step instructions so the learner can either follow every single item or only the main steps depending on his own level of knowledge. Eventually learners may evaluate a checklist to gain feedback which parts they managed and which ones they might want to repeat. After having finished the guided part successfully learners can switch to the exercises. Here they will get a task and need to plan their activities themselves. First evaluation results gained in a workshop with teachers support the hypothesis that the implemented concept is highly supportive.

关键词： Automation Programming Hardware Periodic structures Training process control

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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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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 Robust control System Design for Plants with Recycle

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IFAC Proceedings Volumes 2014年第3期47卷 346-351页

作者： O. Taiwo A. Bamimore S. Adeyemo R. King Process Systems Engineering Laboratory Obafemi Awolowo University Ile-Ife Nigeria Measurement and Control Group Institute of Process and Plant Technology Sekr P2-1 Technical University of Berlin Hardenberger Str.36a D-1063 Germany

关键词： Recycle plants recycle compensator multi-loop robust performance robust stability

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Centralized Robust Multivariable controller Design Using Optimization

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IFAC Proceedings Volumes 2014年第3期47卷 5746-5751页

作者： O. Taiwo S. Adeyemo A. Bamimore R. King Process Systems Engineering Laboratory Obafemi Awolowo University Ile-Ife Nigeria Measurement and Control Group Institute of Process and Plant Technology Sekr P2-1 Technical University of Berlin Hardenberger Str.36a D-1063 Germany

关键词： Centralized controller robust stability and performance optimization moment approximant

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Sensor system for unsteady flow characteristics in a sonic nozzle with vapor condensation

Sensor system for unsteady flow characteristics in a sonic n...

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International Instrumentation and Measurement Technology Conference

作者： Chao Wang Hongbing Ding Yakun Zhao Yong Yan Yonghui hu Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Instrumentation Control and Embedded Systems Group School of Engineering and Digital Arts University of Kent School of Control and Computer Engineering North China Electric Power University

ISBN: (纸本)9781467363846

Experiments on periodic, unsteady compressible flow in a sonic nozzle with heat addition were reported. This unsteady flow is caused by the condensation of water vapor in the sonic nozzle which will affect the flow rate of the sonic nozzle. A dimensional analysis for the essential effect factors of unsteady flow frequency was carried out. An experimental system including a sensor for pressure oscillation monitoring was built. The experimental results agree well with the simulation and semi-empirical formula. Both the sensor and experimental results can be used to further study the effect of unsteady flow due to the condensation of water vapor on the flow rate of the sonic nozzle.

关键词： fast pressure sensor frequency characteristics unsteady flow rate vapor condensation sonic nozzle

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