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检索条件"任意字段=Symposium on Dynamics and Control of Process Systems"

共 1799 条记录，以下是781-790 订阅

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Certifying robustness of separating inputs and outputs in active fault diagnosis for uncertain nonlinear systems

Certifying robustness of separating inputs and outputs in ac...

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10th IFAC symposium on dynamics and control of process systems, DYCOPS 2013

作者： Streif, Stefan Hast, Daniel Braatz, Richard D. Findeisen, Rolf Institute for Automation Engineering Laboratory Systems Theory and Control Otto-von-Guericke University Magdeburg Germany Massachusetts Institute of Technology Cambridge MA United States

ISBN: (纸本)9783902823595

To ensure safe operation of technical processes, faults have to be reliably detected and isolated to provide information for process maintenance, shutdown, or reconfiguration. Fault detection and isolation can be achieved by invalidation of fault candidates, i.e. models of the system in fault-free and faulty condition. In order to enhance the performance of fault detection and isolation, so-called active approaches use input signals with the objective that the resulting system outputs are consistent with at most one fault candidate. Guaranteeing or analyzing robustness of active fault diagnosis with respect to input, output, and process uncertainties and nonlinearities is challenging. This paper provides certificates of robustness of input sequences with respect to the aforementioned uncertainties and nonlinearities. The certificates enable the determination of input and output uncertainties for which unique fault diagnosis results can still be guaranteed. In addition, a method is presented to select a minimal number of outputs that still guarantee robust fault diagnosis, thus reducing the measurement setup and cost. The approach employs nonlinear mixed-integer feasibility problems and a relaxation framework and does not require the explicit computation of reachable sets. The approach is applicable to polynomial discrete-time systems and is demonstrated for a numerical example. © IFAC.

关键词： Nonlinear systems

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Input-output linearizing control of a thermal cracking furnace described by a coupled PDE-ODE system

Input-output linearizing control of a thermal cracking furna...

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10th IFAC symposium on dynamics and control of process systems, DYCOPS 2013

作者： Tawai, A. Panjapornpon, C. Center of Excellence on Petrochemicals and Material Technology Department of Chemical Engineering Kasetsart University Bangkok 10900 Thailand

ISBN: (纸本)9783902823595

This research presents a control scheme for a gas-fired ethylene dichloride (EDC) cracking furnace to handle a cracked gas temperature at the coil outlet. Input-output (I/O) linearizing control scheme is applied to the furnace model of which interaction between a lumped temperature of gas-fire radiating wall and spatially distributed dynamics of cracking coil is considered. In the proposed method, the feedback I/O linearizing controller for coupled PDE-ODE system is applied to force the cracked gas temperature to follow a desired trajectory by manipulation of a fuel gas flow rate. Simulation results showed that the proposed controller successfully forced the controlled output to a desired setpoint without off-set. © IFAC.

关键词： Gas temperature

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Predictive control of a reactive distillation column using multi-rate DAE EKF

Predictive control of a reactive distillation column using m...

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10th IFAC symposium on dynamics and control of process systems, DYCOPS 2013

作者： Purohit, Jalesh L. Patwardhan, Sachin C. Mahajani, Sanjay M. Chemical Engineering Department Indian Institute of Technology Bombay 400076 India

ISBN: (纸本)9783902823595

control of product purity is of paramount importance in effective control of tightly integrated process such as reactive distillation. In practice, however, measurements of product concentrations may be unavailable or may be available at slower sampling rates when compared with other measurements. A cost effective approach to improve control of such systems is to develop a state estimator that can accommodate measurements at multiple rates and use it in controller development. In this work, DAE EKF formulation developed by Mandela et al. (2010) is modified to accommodate measurements available at multiple sampling rates. A successive linearization based nonlinear MPC scheme is then developed for controlling a system modeled as DAEs. Observer error feedback approach developed by Hunag et al. (2012) has been extended to achieve offset reduction and to improve regulatory control of a multi-rate sampled data system. The efficacy of the proposed approach is demonstrated by conducting simulation studies on an ideal reactive distillation system. Analysis of the simulation results reveals that the feedback introduced using the multi-rate concentration measurements reduces the offset significantly in the face of unmeasured disturbances of moderate magnitude. © IFAC.

关键词： Extended Kalman filters

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On the way to autonomous model predictive control: A distillation column simulation study

On the way to autonomous model predictive control: A distill...

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10th IFAC symposium on dynamics and control of process systems, DYCOPS 2013

作者： Annergren, M. Kauven, D. Larsson, C.A. Potters, M.G. Tran, Q. Özkan, L. Automatic Control Lab. and ACCESS School of Electrical Engineering KTH SE-100 44 Stockholm Sweden RWTH Aachen University AVT - Process Systems Engineering Turmstr. 46 52064 Aachen Germany Delft Center for Systems and Control Delft University of Technology Mekelweg 2 2628 CD Delft Netherlands Department of Electrical Engineering Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven Netherlands

ISBN: (纸本)9783902823595

Model Predictive control (MPC) is a powerful tool in the control of large scale chemical processes and has become the standard method for constrained multivariable control problems. Hence, the number of MPC applications is increasing steadily and it is being used in application domains other than petrochemical industries. A common observation by the industrial practitioners is that success of any MPC application requires not only efficient initial deployment but also maintenance of initial effectiveness. To this end, we propose a novel high level automated support strategy for MPC systems. Such a strategy consists of components such as performance monitoring, performance diagnosis, least costly closed loop experiment design, re-identification and autotuning. This work presents the novel technological developments in each component and demonstrates them on a distillation column case study. We show that automated support strategy restores nominal performance after a performance drop is detected and takes the right course of action depending on its cause. © IFAC.

关键词： Model predictive control

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MPC performance monitoring of a rigorously simulated industrial process

MPC performance monitoring of a rigorously simulated industr...

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10th IFAC symposium on dynamics and control of process systems, DYCOPS 2013

作者： Pannocchia, Gabriele Bottai, Michele De Luca, Andrea Department of Civil and Industrial Engineering University of Pisa Pisa 56126 Italy Novachem S.r.l. Sesto San Giovanni Milan 20099 Italy Italy

ISBN: (纸本)9783902823595

We address in this paper the application of a recently proposed MPC performance monitoring method to a rigorously simulated industrial process. The methodology aims at detecting possible sources of suboptimal performance of linear offset-free MPC algorithms by analysis of the prediction error sequence, discriminating between the presence of plant/model mismatch and incorrect disturbance/state estimation, and proposing for each scenario an appropriate corrective action. We focus on the applicability of the method to large-scale industrial systems, which typically comprise a block structure, devising efficient and scalable diagnosis and correction procedures. We also discuss and support the application of this method when the controlled plant shows a mild nonlinear behavior mainly associated with operating point changes. A high-fidelity dynamic simulation model of a crude distillation unit was developed in UniSim® Design and used as representative test bench. Results show the efficacy of the method and indicate possible research directions for further improvements. © IFAC.

关键词： Model predictive control

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Simulation and control of the oxidation of sulfur dioxide in a micro-structured reactor

Simulation and control of the oxidation of sulfur dioxide in...

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10th IFAC symposium on dynamics and control of process systems, DYCOPS 2013

作者： Wegerhoff, Sven Engell, Sebastian Process Dynamics and Operations Group Technische Universität Dortmund Emil-Figge-Str. 70 44227 Dortmund Germany

ISBN: (纸本)9783902823595

For producing sulfur trioxide, sulfur dioxide is oxidized to sulfur trioxide in the presence of a catalyst. Industrially, sulfur trioxide is produced by the contact process which consists of several catalytic beds and inter-cooling stages between them. This process is highly energy intense and inflexible due to long periods of start-up and shut-down caused by the thermal inertia. In order to improve the flexibility of the production process, a new approach for producing sulfur trioxide is currently being investigated. A micro-structured reactor has been constructed by the Karlsruhe Institute for Technology (KIT) which consists of only one cooling passage. In our work, a three dimensional dynamic reactor model was developed that describes the dynamic behavior of the micro-structured reactor. This model was used to simulate the efficiency and the distribution of temperature and reactants in the system and in particular for investigating the start-up of the reactor. A control strategy was developed and tested in simulations in order to react on disturbances and to improve the start-up time. The simulations showed that a conversion of approx. 98.5 % can be reached and by a suitable control strategy the start up time can be improved significantly. © IFAC.

关键词： Heat transfer

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Model predictive control of flow and pressure in underbalanced drilling

Model predictive control of flow and pressure in underbalanc...

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10th IFAC symposium on dynamics and control of process systems, DYCOPS 2013

作者： Pedersen, Torbjørn Godhavn, John-Morten Department of Petroleum Engineering and Applied Geophysics Norwegian University of Science and Technology N-7491 Trondheim Norway Statoil Research Centre N-7053 Trondheim Norway

ISBN: (纸本)9783902823595

This paper presents a novel application of linear model predictive control (MPC) for pressure and flow control in underbalanced drilling operations. Coordinated control of pump flow and choke pressure is used to control the return flow rate, and the well pressure profile. The control system is verified using a high fidelity drilling simulator for some common drilling operations. The proposed solution shows promising results for operations close to the selected set-points, but the simple models employed have distinct limitations. The control solution is easily extendable to larger control problems, and can be augmented with better models. © IFAC.

关键词： Model predictive control

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On-line implementation of decoupled input-output linearizing controller in Baker's yeast fermentation

On-line implementation of decoupled input-output linearizing...

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10th IFAC symposium on dynamics and control of process systems, DYCOPS 2013

作者： Chopda, Viki R. Rathore, Anurag S. Gomes, James Chemical Engineering Department Indian Institute of Technology Hauz Khas New Delhi 110016 India School of Biological Sciences Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India

ISBN: (纸本)9783902823595

Baker's yeast fermentation is influenced by the relative concentration of glucose and dissolved oxygen (DO) in the reactor. The process is sensitive to the oxidative capacity of the cells and exhibits a range of metabolic regimes depending on available glucose and oxygen. The time profiles of cell mass, glucose, ethanol and DO concentrations possess strong nonlinear characteristics. A decoupled input-output linearizing controller (DIOLC), which exhibited satisfactory performance in simulation experiments, was implemented online for validation. Our results showed that the DIOLC was capable of negating the interaction between glucose and dissolved oxygen, and executed satisfactory control action in experiments carried out in a 5 liter bioreactor. The performance of DIOLC was better compared to that of a PID controller implemented under identical test conditions. © IFAC.

关键词： Three term control systems

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Sensor fault accommodation strategies in multi-rate sampled-data control of particulate processes

Sensor fault accommodation strategies in multi-rate sampled-...

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10th IFAC symposium on dynamics and control of process systems, DYCOPS 2013

作者： Napasindayao, Trina G. El-Farra, Nael H. Department of Chemical Engineering and Materials Science University of California Davis CA 95616 United States

ISBN: (纸本)9783902823595

This paper focuses on the problem of handling sensor faults in controlled particulate processes with multi-rate sampled-data measurements. The problem is addressed on the basis of an approximate finite-dimensional system that captures the dominant dynamics of the infinite-dimensional particulate process system. An observer-based output feedback controller with an inter-sample model predictor is initially designed. The inter-sample model predictor provides the observer with estimates of the unavailable outputs, and its predictions are corrected each time that a measurement becomes available. Owing to the different sampling rates of the measurement sensors, the model update is performed using different outputs, or combinations of outputs, at each update time. The combined discrete-continuous closed-loop system is analyzed, and an explicit characterization of the feasible combinations of output sampling rates, model uncertainty, as well as controller and observer design parameters is obtained. This characterization is used as the basis for the development of both passive and active fault-tolerant control strategies that preserve closed-loop stability in the presence of sensor faults. The results are illustrated using a simulated model of a non-isothermal continuous crystallizer. © IFAC.

关键词： Fault tolerance

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Joint routing and transmission power control for Collection Tree Protocol in WSN

Joint routing and transmission power control for Collection ...

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2013 IEEE 24th Annual International symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2013

作者： Barceló, Marc Correa, Alejandro Vicario, José López Morell, Antoni Universitat Autònoma de Barcelona Telecommunications and Systems Engineering Department Spain

ISBN: (纸本)9781467362351

Wireless sensor networks (WSNs) have strict energy consumption requirements. Moreover, the complexity constraints of the nodes and the wireless dynamics must be considered in real life implementations. CTP (Collection Tree Protocol) is a state-of-the-art routing protocol that considers the main issues that arise in practical WSN applications. Nowadays, commercial wireless sensors can adjust their transmission power to reduce the energy consumption and the collision probability of the network. Since nodes in CTP transmit at a predefined power, the reliability and the lifetime of the network may be reduced. To solve this, this paper proposes an alternative routing metric for CTP, referred to as MaxPDR, that includes a transmission power control in the routing process. With this strategy, the incompatibility issues and the additional signaling that may arise with the combination of individual techniques are avoided. MaxPDR has been implemented in commercial motes to evaluate its performance and compare it with the routing metrics used by the original CTP and ZigBee. © 2013 IEEE.

关键词： Energy utilization

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