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OPTIMIZING control OF VARIABLE CYCLE TIME SIMULATED MOVING BEDS

IFAC Proceedings Volumes 2007年第5期40卷 201-206页

作者： Cristian Grossmann Mohammad Amanullah Marco Mazzotti Massimo Morbidelli Manfred Morari ETH Zurich Automatic Control Laboratory Physikstrasse 3 8092 Zürich Switzerland ETH Zurich Institute of Process Engineering Sonneggstrasse 3 8092 Zürich Switzerland ETH Zurich Institute for Chemical and Bio-Engineering 8093 Zürich Switzerland

Simulated moving bed (SMB) is a cost-efficient chromatographic technique employed for difficult separation tasks. SMB processes exhibit complex dynamics, e.g., its hybrid nature due to the inlet/outlet port switches with nonlinearities and delays. The novel feature presented in this work is the extension of the ‘cycle to cycle’ control concept to make use as manipulated variables, of the four sectional flow rates and the switch time. Its effectiveness is demonstrated through two case studies; the startup of a SMB unit under plant-model mismatch and the rejection of a pump disturbance.

关键词： Optimization Repetitive Model Predictive control automatic process control Simulated Moving Bed

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Experimental Implementation of ‘Ccycle to Cycle’ control of Simulated Moving Bed Chromatography: For Chiral Separation

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Chemie Ingenieur Technik 2007年第9期79卷

作者： C. Langel M. Amanullah C. Grossmann M. Morari M. Mazzotti M. Morbidelli Institute of Process Engineering ETH Zurich Sonneggstraße 3 CH‐8092 Zürich Automatic Control Laboratory ETH Zurich Physikstraße 3 CH‐8092 Zürich Institute for Chemical and Bio‐Engineering ETH Zurich Wolfgang‐Pauli‐Straße 10 CH‐8093 Zürich

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Analysis and assessment of stress in two typical drawing tube headers

Analysis and assessment of stress in two typical drawing tub...

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ASME PVP2006/ICPVT-11 Conference

作者： Zengliang, Gao Jie, Chen Gangsi, Cai Xin, Ren Qing, Li Zhejiang University of Technology Institute of Process Equipment and Control Engineering MOE Key Laboratory of Mechanical Manufacture and Automation Hangzhou 310032 China

ISBN: (纸本)0791837823

Finite element analysis and stress measurement are carried out for two typical drawing tube headers, which is a new kind of tube header without fillet weld. The material of the drawing tubes and header is SA335-P91. Two cases, normal operating condition (case 1) and cold start up condition (case 2), are analyzed. The maximum stresses are located in the inner corner of the drawing tube for one row of tube header, while the maximum stresses for both cases are located in the inner corner of the cover plate for two row of tube header. The stresses at the drawing tube for both cases meet ASME requirement for stress for both drawing tube headers. Fatigue life of the two row of drawing tube header is more than 10 cycles. Copyright © 2006 by ASME.

关键词： Piping systems

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Online 'cycle to cycle' optimizing control of Varicol and Simulated Moving Bed (SMB) processes

Online 'cycle to cycle' optimizing control of Varicol and Si...

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2006 AIChE Annual Meeting

作者： Amanullah, Mohammad Grossmann, Cristian Mazzotti, Marco Morari, Manfred Morbidelli, Massimo Institute of Process Engineering ETH Zurich CH-8092 Zurich Switzerland Automatic Control Laboratory ETH Zurich CH-8092 Zurich Switzerland Institute for Chemical and Bio-Engineering ETH Zurich CH-8093 Switzerland

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ISBN: (纸本)081691012X

No abstract available

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Analysis of fractional - Order robot axis dynamics

Analysis of fractional - Order robot axis dynamics

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作者： Rosario, J.M. Dumur, D. Tenreiro Machado, J.A. Laboratory of Automation and Robotics Faculty of Mechanical Engineering UNICAMP - University of Campinas 13083-970 - Campinas- SP Brazil Department of Automatic Control SUPELEC 91192 - Gif-sur-Yvette France Department of Electrical Engineering Institute of Engineering Polytechnic Institute of Porto 4200-072 Porto Portugal

ISBN: (纸本)9783902661128

Robots are complex mechatronics systems where several electric drives are employed to control the movement of articulated structures. In industrial environments they must perform tasks with rapidity and accuracy in order to produce goods and services with minimal production time. These procedures require the use of flexible robots which can act in a large workspace, thus subjected to important parameters variations and nonlinear dynamics effects. This paper investigates the fractional order dynamics during the evolution of trajectories of three robotic joints, considering the complete system dynamics. Copyright © 2006 IFAC.

关键词： Calculations

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Design of verified logic control programs

Design of verified logic control programs

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IEEE International Conference on Computer-Aided Design

作者： Sven Lohmann Lan Anh Dinh Thi Olaf Stursberg Process Control Laboratory Department of Biochemical and Chemical Engineering University of Dortmund Dortmund Germany Institute of Automatic Control Engineering Department of Electrical Engineering and Information Technology Technical University Munich Munich Germany

To complement the largely manual design of logic control programs in industrial practice, this contribution proposes a method for systematically (and partly algorithmically) deriving logic controllers for given specifications. The main idea is to structure the information available for the design in form of specific intermediate formats which are iteratively refined and straightforwardly lead to controllers formulated as Sequential Function Charts. To analyze whether the design complies with all given specifications, model-based verification is applied subsequently, i.e. the controller is converted into timed automata, the latter are composed with a plant model, and model-checking algorithmically verifies (or falsifies) logic properties for the composed system. The procedure is described here for the example of a multi-product batch plant.

关键词： Logic design automatic control Programmable control control systems Automata Algorithm design and analysis Electrical equipment industry Industrial control Iterative algorithms Natural languages

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ANALYSIS OF FRACTIONAL - ORDER ROBOT AXIS DYNAMICS

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IFAC Proceedings Volumes 2006年第11期39卷 367-372页

作者： J.M. Rosario D. Dumur J.A. Tenreiro Machado Laboratory of Automation and Robotics - Faculty of Mechanical Engineering UNICAMP - University of Campinas 13083-970 – Campinas- SP Brazil Department of Automatic Control SUPELEC 91192 - Gif-sur-Yvette France Department of Electrical Engineering Institute of Engineering Polytechnic Institute of Porto 4200-072 Porto Portugal

关键词： Mechatronics Robotics Simulation Dynamics control Fractional calculus

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Method of surface EMG pattern recognition based on AR parameter model and clustering analysis

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Jiliang Xuebao/Acta Metrologica Sinica 2006年第3期27卷 286-289页

作者： Cui, Jian-Guo Wang, Xu Li, Zhong-Hai Tian, Feng Key Laboratory of Process Industry Automation of Ministry of Education Northeastern University Shenyang 110004 China Department of Automation Control Shenyang Institute of Aeronautical Engineering Shenyang 110034 China

Surface electromyography (SEMG) is a bio-electrical manifestation related to neuromuscular activation. Electromyography pattern recognition plays an important role in SEMG application. A new SEMG pattern recognition method based on AR parameter model and clustering analysis is proposed. Four channel SEMG signals from corresponding muscles (palmaris longus, brachioradialis, flexor carpi ulnaris, biceps brachii) are picked up and analyzed with AR model parameter. Using AR model parameters as signal characteristics, an eigenvector is composed and inputted to the Mahalanobis distance classifier to identify different movement patterns. Eight movement patterns (hand grasps, hand extension, wrist circumrotates entad, wrist circumrotates forth, wrist bends, wrist spreads, forearm circumrotates entad, forearm circumrotates forth) are successfully identified. Experiments show that the proposed method performs very well and the recognition result is robust. It is believed that this method can be straightforwardly expanded to other nonstationary bioelectric signals pattern recognition study.

关键词： Autoregressive (AR) parameter model Clustering analysis Metrology Pattern recognition Surface electromyography

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Solving polynomial static output feedback problems with PENBMI

Solving polynomial static output feedback problems with PENB...

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IEEE Conference on Decision and control

作者： D. Henrion J. Lofberg M. Kocvara M. Stingl LAAS CNRS Toulouse France Department of Control Engineering Faculty of Electrical Engineering Czech Technical University Prague Czech Republic Automatic Control Laboratory Swiss Federal Institute of Technology Zurich Switzerland Institute of Information Theory and Automation Academy of Sciences슠of the슠Czech Republic Prague Czech Republic Institute of Applied Mathematics University of Erlangen Erlangen Germany

An algebraic formulation is proposed for the static output feedback (SOF) problem: the Hermite stability criterion is applied on the closed-loop characteristic polynomial, resulting in a non-convex bilinear matrix inequality (BMI) optimization problem for SIMO or MISO systems. As a result, the BMI problem is formulated directly in the controller parameters, without additional Lyapunov variables. The publicly available solver PENBMI 2.0 interfaced with YALMIP 3.0 is then applied to solve benchmark examples. Implementation and numerical aspects are widely discussed.

关键词： Polynomials Output feedback Linear matrix inequalities Stability criteria Eigenvalues and eigenfunctions control engineering Lagrangian functions automatic control Laboratories Information theory

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Fault Detection and Diagnosis of a Linear Hydraulic Servo Axis

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IFAC Proceedings Volumes 2004年第6期37卷 861-866页

作者： Marco Muenchhof Rolf Isermann Institute of Automatic Control Laboratory of Control Engineering and Process Automation Darmstadt University of Technology Landgraf-GeorgrStr. 4 D-64283 Darmstadt Germany Phone: + 49 6151 16-7406 FAX: +49 6151 16-74 21

process model based methods to detect faults in a hydraulic linear servo axis by measurement of up to five variables are presented. The faults that are detected include gas enclosures in the hydraulic fluid, such as air, vapour and foam. The control edges and the valve spool are also monitored in order to detect faults such as erosion of the control edges and grooving of the valve spool. Furthermore, the leakage flow between the cylinder chambers and to the surroundings are monitored, which allows to detect damages of the sealing between the cylinder chambers and between the cylinder and the pushrod. The external mechanical load and the valve spool dynamics are also included in the fault detection and diagnosis approach.

关键词： Fault Detection Fault Diagnosis Hydraulic Actuator Parameter Estimation

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