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IEEE International symposium on Intelligent control (ISIC)

作者： P. Zhang S.X. Ding Institute for Automatic Control and Complex Systems University of Duisburg-Essen Duisburg Germany

This paper is concerned with the detection of actuator faults in nonlinear systems. With the theoretical development of sophisticated fault detection and isolation (FDI) approaches, the implementation of FDI algorithms is, however, often constrained by the available computational power. On the other side, in many practical applications, in order to avoid extra hardware and investment, FDI algorithms often share processor with control algorithms. Such a background motivates the study in this paper, namely, whether part of the controller information can be utilized to simplify the FDI algorithm and thus promote the application of FDI technique in industry. In the context of inverse dynamics controller a positive answer is provided by the investigation in this paper

关键词： Fault detection Nonlinear systems Automatic control Nonlinear control systems control systems Actuators Linear feedback control systems Hardware Investments process control

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Detecting sensor faults for a chemical reactor rig via adaptive neural network model

Detecting sensor faults for a chemical reactor rig via adapt...

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Second International symposium on Neural Networks: Advances in Neural Networks - ISNN 2005

作者： Yu, Ding-Li Yu, Dingwen Control Systems Research Group School of Engineering Liverpool John Moores University Byrom Street Liverpool L3 3AF United Kingdom Dept. of Automation Northeast University Qinhuangdao China

An adaptive neural network model based approach to sensor fault detection is proposed for multivariable chemical processes. The neural model is used to predict process output for multi-step ahead with the prediction error used as the residual, while the model is on-line updated to capture dynamics change. The recursive orthogonal least squires algorithm (ROLS) is used to adapt a radial basis function (RBF) model to reduce the effects of data ill conditioning. Two error indices are developed to stop the on-line updating of the neural model and its corresponding threshold is used to distinguish the fault effect from model uncertainty. The proposed approach is evaluated in a three-input three-output chemical reactor rig with three simulated sensor faults. The effectiveness of the method and the applicability of the method to real industrial processes are demonstrated. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Chemical reactors

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Intelligent control of model helicopters - a building block approach

Intelligent control of model helicopters - a building block ...

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Midwest symposium on Circuits and systems (MWSCAS)

作者： P.A. Ramamoorthy N. Gopalarathinam Department of Electrical & Computer Engineering and Computer Science University of Cincinnati USA

There is a growing interest in the modeling and control of model helicopters using nonlinear dynamic models and nonlinear control. A helicopter is an underactuated system with fewer independent control actuators than degrees of freedom to be controlled, making the control difficult. Further, most of the models and control are derived for separate flight conditions such as take-off or hovering because of the complexity involved. This simplification in fact seems to make the problem more difficult since the simplified model might not have the properties associated with the original physical system. Analytical techniques based on Lyapunov theory are then used to design the controller and the design can become extremely complex. In this paper, we present a new nonlinear and adaptive controller design. The design methodology basically involves making the combined dynamics of the helicopter and the controller to resemble the dynamics of a nonlinear time varying electrical circuit having the required properties, using a process similar to reverse engineering. This conceptually simple procedure leads to a new general class of complex nonlinear and adaptive controller algorithms without the use of or the necessity for complex analytical tools, and hence can be understood and applied easily. Even though the solution provided here is for a particular flight condition, this approach can easily be extended to multiflight conditions.

关键词： Intelligent control Helicopters control systems Nonlinear dynamical systems Programmable control Adaptive control Actuators Design methodology Circuits Reverse engineering

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Non-Linear Model Reduction for Metabolic Networks with Multiple Time-Scales

Non-Linear Model Reduction for Metabolic Networks with Multi...

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IEEE International symposium on Intelligent control (ISIC)

作者： Z.P. Gerdtzen P. Daoutidis Wei-Shou Hu Department of Chemical Engineering and Materials Science University of Minnesota Minneapolis MN USA

We present a method for obtaining non-stiff nonlinear reduced-order models for metabolic networks, which exhibit dynamics in multiple time scales. The method is based on the successive application of singular perturbation arguments, starting from the fastest time scale and proceeding to the slowest one. The method is successfully applied to a detailed model of central carbon metabolism in human erythrocytes

关键词： Reduced order systems Biochemistry Mathematical model Humans Chemical analysis Cells (biology) Chemical engineering Materials science and technology Biochemical analysis process control

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Envisat mission automation - A first demonstration

Envisat mission automation - A first demonstration

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6th International symposium on Reducing the Costs of Spacecraft Ground systems and Operations, RCGSO

作者： Rudolph, Andreas Diekmann, Frank J. Monham, Andrew T. Rother, Fabian Heinen, Wolfgang Robert Bosch Strasse 5 D-64293 Darmstadt Germany Rhea System SA EUMETSAT Am Kavalleriesand 31 D-64295 Darmstadt Germany VEGA IT GmbH Robert Bosch Strasse 7 64293 Darmstadt Germany Rhea System SA New Tech Center Avenue Einstein 2a B-1348 Louvain-La-Neuve Belgium

ESA/ESOC is currently investigating the potential to introduce a higher degree of automation into the organisation's flight operations activities. A significant element of this process has been a study into analysing the operations of ESA's ENVISAT Low Earth Orbit Earth Observation mission launched on 1-Mar-2002. The current operations concept of this mission is supported by a level of automation on-board and in the control system and mission planning system sufficient to allow secure operations with close to 100% mission data return with the permanent presence of a single (shift) operator. This operator is also controlling the ERS2 satellite since visibilities do not occur in parallel. The objectives of the study was to analyse the potential to reduce the need for a permanent operator presence during visibility periods. For this purpose an analysis of existing nominal and some well-defined anomaly diagnosis and recovery procedures was performed. Automated execution of selected ENVISAT procedures (nominal and contingency recovery procedures) using the automation system and the MCS with the simulator was demonstrated successfully to a wider audience in ESOC. The paper presents the results of this demonstration and the lessons learnt from the study. It concludes with an outlook on the next, potential steps towards an operational system for the ERS2 and ENVISAT mission.

关键词： Flight dynamics

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Integration of biological systems content into the process dynamics and control curriculum 7th

Integration of biological systems content into the process d...

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7th IFAC symposium on dynamics and control of process systems, DYCOPS 2004

作者： Parker, Robert S. Doyle, Francis J. Henson, Michael A. Department of Chemical and Petroleum Engineering University of Pittsburgh PittsburghPA United States Department of Chemical Engineering University of California at Santa Barbara Santa BarbaraCA United States Department of Chemical Engineering University of Massachusetts at Amherst AmherstMA United States

The evolution of the chemical engineering discipline motivates a recvaluation of the process dynamics and control curriculum. A key requirement of future courses is the introduction of theoretical concepts and application examples relevant to emerging areas such as complex biological systems. We outline the critical concepts required to integrate biological content within the traditional framework of process dynamics and control. Our initial experience with three courses is outlined to demonstrate alternative approaches to achieve this integration. The paper concludes with a discussion of open issues which require further attention from the process control and biological systems communities. Copyright © IFAC dynamics and control of process systems. Cambridge, Massachusetts, USA, 2004

关键词： process control

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Synthesis of operating procedures and procedural controllers for batch processes based on Petri nets

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JOURNAL OF THE CHINESE INSTITUTE OF CHEMICAL ENGINEERS 2004年第3期35卷 363-369页

作者： Hashizume, S Yajima, T Ito, T Onogi, K Nagoya Univ Dept Chem Engn Chikusa Ku Nagoya Aichi 4648603 Japan

Batch control is characterized by procedural control that is realized according to operating procedures to accomplish tasks. However, operating procedure synthesis takes considerable time and effort as the complexity of a batch process increases. To solve the operating procedure synthesis problem, a modeling technique is needed to represent the concurrent dynamics of a batch process. This paper aims at developing a method to synthesize operating procedures and procedural controllers for batch processes. For this purpose, it first views a batch control system as a discrete event system and next uses hierarchical Petri nets to represent information about process, plant, and schedule. It then presents a method to synthesize operating procedures. It also discusses the verification of synthesized operating procedures and last presents a method to synthesize procedural controllers.

关键词： hierarchical Petri net procedural control batch process discrete event system

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control of current reversal and separation of particles in inertia ratchets

Control of current reversal and separation of particles in i...

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symposium on dynamics in Small Confining systems VII held at the 2003 MRS Fall Meeting

作者： Family, F Larrondo, HA Arizmendi, CM Emory Univ Dept Phys Atlanta GA 30322 USA

ISBN: (纸本)1558997288

We have studied the deterministic dynamics of underdamped single and multiparticle ratchets associated with current reversal, as a function of both the amplitude and the frequency of an external driving force. We show that control of current reversals in deterministic inertia ratchets is possible as a consequence of a locking process associated with different mean velocity attractors. control processes employing small perturbations on the frequency and the amplitude of the external force may be designed in view of the intermixed fractal nature of the domains of attraction of the mean velocity attractors. The range where each control parameter is capable of reversing the current is determined. Quenched noise has significant effect on the basins of attraction. In particular, with increasing disorder the direction of a packet of particles can be reversed, leading to disappearance or weakening of the negative velocity attractor. The influence of the mass of the particles is also considered in order to design control techniques capable of separating particles of different masses.

关键词： Materials science

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A filter based approach for estimation of PI achievable performance 7th

A filter based approach for estimation of PI achievable perf...

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7th IFAC symposium on dynamics and control of process systems, DYCOPS 2004

作者： Jain, Mranal Lakshminarayanan, S. Department of Chemical and Biomolecular Engineering National University of Singapore Singapore117576 Singapore

We present a new filter based method for the calculation of PI achievable performance for simple feedback control systems. We also extend this new approach to multiloop systems and address some key questions such as (a) what would be the performance with alternate loop pairing? (b) what performance improvement will accrue through the use ofdecouplers in multiloop control systems? © IFAC dynamics and control of process systems, Cambridge, Massachusetts, USA, 2004

关键词： Adaptive control systems

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On-line optimization via off-line parametric optimization! - A guided tour to parametric programming and control 7th

On-line optimization via off-line parametric optimization! -...

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7th IFAC symposium on dynamics and control of process systems, DYCOPS 2004

作者： Pistikopoulos, Efstratios N. Dua, Vivek Centre for Process Systems Engineering Imperial College LondonSW7 2AZ United Kingdom Centre for Process Systems Engineering University College WC1E 7JE United Kingdom

In this paper model predictive control problems are reformulated as multi-parametric programs. The optimal value of control variables is obtained as an explicit function of the state variables. This reduces on-line optimization to simple function evaluations that need simple computational hardware. Copyright © IFAC dynamics and control of process systems, Cambridge, Massachusetts, USA, 2004

关键词： Hybrid control Model predictive control Multi-parametric dynamic optimization Multi-parametric programming Real-time optimization

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