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作者： Elsner, M.P. Muslera, E. Alonso Angelov, I. Fernaśndez Menéndez, D. Lorenz, H. Polenske, D. Vollmer, U. Raisch, J. Seidel-Morgenstern, A. Max Planck Institute for Dynamics of Complex Technical Systems Physical and Chemical Foundations of Process Engineering Sandtorstr. 1 39106 Magdeburg Germany Max Planck Institute for Dynamics of Complex Technical Systems Systems and Control Theory Group Sandtorstr. 1 39106 Magdeburg Germany Otto von Guericke University Department of Chemical Engineering Universitätsplatz 2 39106 Magdeburg Germany Otto von Guericke University Department of System Theory of Process Engineering PO Box 4120 39106 Magdeburg Germany

The intention of this paper is the analysis of general concepts for preferential crystallisation with the focus on aspects of quantification. In this preliminary examination, the amino acid threonine was used as a model system. The use of on-line polarimetry in combination with on-line densimetry as well as microscopic investigation enables to obtain some indispensable information about the crystallisation kinetics. Taking these estimated values into consideration a simplified mathematical description as a first approach including a population balance model was established for the simulation of the time changes of liquid phase composition during the preferential crystallisation process. Based on this simplified model different crystalliser configurations were investtigated.

关键词： Crystallization

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Mathematical modeling of neuronal response to neuropeptides: Angiotensin II signaling via G-protein coupled receptor

Mathematical modeling of neuronal response to neuropeptides:...

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2004 AIChE Annual Meeting

作者： Vadigepalli, Rajanikanth Sauter, Thomas Hao, Haiping Schwaber, James Daniel Baugh Institute for Functional Genomics and Computational Biology Department of Pathology Thomas Jefferson University Philadelphia PA 19107 Institute for System Dynamics and Control Engineering University of Stuttgart Pfaffenwaldring 9 D-70550 Stuttgart Germany

We have developed a mathematical model of the AT1 mediated pathways including activation of PLC, PKC, IPS, and channel mediated variation of the cytosolic Ca2+ level after Angiotensin II stimulation. Different Ca2+ responses and the respective time courses of activated PKC and Ca2+ dependent proteins, e.g. CaMKII are described in the model. The obtained simulation results are in good agreement with the measurement data found in literature. For example, the model describes the state-dependent exposure to Angll: increase in Ca2+ at low baseline Ca2+ levels as well as the decrease in Ca2+ at high (chronic activated) baseline. Additionally, simulation studies revealed that variations in the Na-Ca-exchanger transport characteristics could account for the observed cell-to-cell variability. Additional pathways were included in the model, e.g. MAPK, thus enabling the description of relevant transcription factor patterns. Also a Hodgkin-Huxley model approach is used to investigate the function of cell signaling in altering the firing behavior of NTS neurons in response to various baroreceptor stimuli.

关键词： Neurology

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Flatness based Optimal Noncausal Output-Transitions for Constrained Nonlinear systems:Case Study for ICSTR

Flatness based Optimal Noncausal Output-Transitions for Cons...

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第二十三届中国控制会议

作者： M.Zeitz F.Allgwer Institute for System Dynamics and Control Engineering Institute for System theory in Engineering University of Stuttgart Pfaffenwaldring 9 D-70550 Stuttgart Germany

This work studies the issue of optimal output transition control for nonlinear flat differential systems with constraints. Of special interest here is to generate a state reference trajectory and a feedforward input command, which are essential for the implementation of exact feedforward linearization. Our approach is to transfer the transition problem in the real output space into a trajectory planning issue in the flat output space. The new aspect of this idea in our approach is to involve the generation of a noncausal trajectory for the flat output. This novelty turns out to be considerably effective for the performance improvement. It is also remarkable that our methodology guarantees the planned trajectories feasible for all nonlocal transitions. This is a new contribution to noncausal output transition control of nonlinear systems. The proposed method is illustrated on a benchmark system, the ICSTR, although its applicability could be much more wider.

关键词： Flatness, output transition, constrained nonlinear systems, noncausal control, Van de Vusse example.

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Mode decoupling controller for feedback model updating

Mode decoupling controller for feedback model updating

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2004 ASME International Mechanical engineering Congress and Exposition, IMECE

作者： Jung, Hnsang Park, Youngjin Park, K.C. System Dynamics and Applied Control Laboratory Department of Mechanical Engineering Korea Advanced Institute of Science and Technology Daejon 305-701 Korea Republic of Center for Aerospace Structures Department of Aerospace Engineering University of Colorado Boulder United States

A novel concept of feedback loop design for modal test and model updating is proposed. This method uses the closed-loop frequency information for parameter modifications to overcome the problems associated with the conventional methods employing the modal sensitivity matrix. To obtain new modal information from the closed-loop system, controllers should be effective in changing modal data while guaranteeing the stability of the closed-loop system. The present paper proposes a mode-decoupling controller that can alter a target mode while guaranteeing the stability of the closed-loop, and that can be constructed by using the measured open-loop mode shapes. A simulation based on time domain input/output data is performed to evaluate the feasibility of the proposed control method, which is subsequently corroborated via experiments. Experimental data obtained on a beam via the proposed mode-decoupling controller have been applied to estimate thicknesses of a beam. The results show that the proposed approach outperforms conventional methods with a far less number of data set for the estimation of system parameters. © 2004 by ASME.

关键词： Modal analysis

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PURPLE: predictive active queue management utilizing congestion information

PURPLE: predictive active queue management utilizing congest...

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Conference on Local Computer Networks (LCN)

作者： R. Pletka M. Waldvogel S. Mannal Zurich Research Laboratory IBM Research USA Institute for System Dynamics and Control Engineering University of Stuttgart Germany

Active queue management (AQM) is an attempt to find a delicate balance between two antagonistic Internet queuing requirements: first, buffer space should be maximized to accommodate the possibly huge transient bursts; second, buffer occupation should be minimum so as not to introduce unnecessary end-to-end delays. Traditional AQM mechanisms have been built on heuristics to achieve this balance, and have mostly done so quite well, but often require manual tuning or have resulted in slow convergence. In contrast, the PURPLE approach predicts the impact of its own actions on the behavior of reactive protocols and thus on the short-term future traffic without keeping pre-flow state. PURPLE allows much faster convergence of the main AQM parameters, at least towards a local optimum, thereby smoothing and minimizing both congestion feedback and queue occupancy. To improve the quality of the prediction, we also passively monitor (using lightweight operations) information pertaining to the amount of congestion elsewhere in the network, for example, as seen by flows traversing this router.

关键词： Information management Traffic control Laboratories Internet Convergence Transport protocols IP networks Delay estimation Computer network management Propagation losses

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Flatness-based feedback tracking control of a distributed parameter tubular reactor model

Flatness-based feedback tracking control of a distributed pa...

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European control Conference (ECC)

作者： T. Meurer J. Becker M. Zeitz Institute of System Dynamics and Control Engineering (ISR) University of Stuttgart Stuttgart Germany Institute A of Mechanics University of Stuttgart Stuttgart Germany

A novel approach for the design of feedback boundary tracking control for parabolic infinite-dimensional systems is illustrated for two coupled nonlinear partial differential equations modelling a tubular reactor. The method is based on a re-interpretation of the flatness-based open-loop design approach using an infinite power series ansatz in the spatial coordinate. It is shown, that by truncating the power series solution, a finite-dimensional approximation of the PDEs can be derived, which is suitable for flatness-based design of feedback boundary control with observer.

关键词： Mathematical model Inductors Observers Convergence Feedback control Temperature Tracking

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Erratum to “Wave propagation in nonlinear and hysteretic media––a numerical study” [International Journal of Solids and Structures 39 (2002) 5585–5614]

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International Journal of Solids and Structures 2003年第1期40卷 249-249页

作者： T Meurer J Qu L.J Jacobs Institute of System Dynamics and Control Engineering University of Stuttgart Pfaffenwaldring 9 70596 Stuttgart Germany G.W.W. School of Mechanical Engineering Georgia Institute of Technology Atlanta GA 30332-0405 USA School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta GA 30332-0355 USA

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New trends in applied microbiology

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Trends in Biotechnology 2002年第1期20卷 P43页

作者： Thomas Sauter Institute for System Dynamics and Control Engineering University of Stuttgart Pfaffenwaldring 9 D-70550 Stuttgart Germany

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Section-wise modeling of traffic flow and its application in traffic state estimation

Section-wise modeling of traffic flow and its application in...

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International Conference on Intelligent Transportation

作者： J. Meier H. Wehlan Institute for System Dynamics and Control Engineering University of Stuttgart Germany

The section-wise macroscopic modeling of traffic flow is considered. A section is supposed to be bounded by detectors and several kilometers long. To compute a section model without input from the adjacent sections, feasible boundary conditions have to be specified and boundary variables have to be approximated by the detector measurements. These approximations lead to unknown disturbances in the section model, depending on the direction of propagation of information in the traffic flow. Various approximations of the boundary variables are described and a disturbance modeling approach is proposed. The application of section models in traffic state estimation and the effects on the estimation error are discussed. Simulation tests are showing the performance of the estimation, based on the various boundary approximations.

关键词： Traffic control State estimation Boundary conditions Detectors Computational modeling Testing Switches Estimation error Kalman filters Information filtering

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Robust Stabilization of Car Steering dynamics

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IFAC Proceedings Volumes 1999年第2期32卷 3283-3288页

作者： Long Wang J. Ackermann Center for Systems and Control Department of Mechanics and Engineering Science Peking University Beijing 100871 Fax: +86-10-51881688 China Institute of Robotics and System Dynamics German Aerospace Research Center DLR-Oberpfaffenhofen D-82230 Wessling Germany

In this paper, by exploiting the intrinsic structure of system equations and uncertainties, we first establish a nonconservative PID stabilization criterion for driver support systems. We then show some interesting results on positivity and connections of PID controllers. Finally, some extreme point results on PID α-stabilization are obtained. These results give certain explanations and justifications for the simulation results performed at German Aerospace Research Center.

关键词： Robust control Car Steering dynamics Parameter Space PID controllers Stabilization Extreme Point Results

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