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CHISA 2006 - 17th International Congress of Chemical and process engineering

作者： Vasickaninova, A. Bakosova, M. Puna, D. Department of Information Engineering and Process Control Institute of Information Engineering Automation and Mathematics Slovak University of Technology Radlinského 9 81237 Bratislava Slovakia

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ISBN: (纸本)8086059456

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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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State-of-the-art 3D graphics for embedded systems

State-of-the-art 3D graphics for embedded systems

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6th International Caribbean Conference on Devices, Circuits and Systems, ICCDCS 2006

作者： Möller, Reinhard Dept. of Electrical Information Media Engineering Automation and Process Control Engineering University of Wuppertal Rainer-Gruenter-Str. 21 42349 Wuppertal Germany

ISBN: (纸本)1424400422

The early days of 3D graphics computing were marked by extremely expensive and highly sophisticated hardware and software. Terms like ubiquitous computing and 3D on handhelds were unthinkable. But the development of obliging common standards like OpenGL, for example, together with rapidly improving graphics technology turned the coin, and now everybody demands for high-performance user interfaces on his everyday-computing environment. Game development industry focuses on mobile technology. Automotive engineering introduces multimodal interfaces and entertainment systems for next generation cars. Although all industrial sectors ask for high performance graphics, they often focus on different aspects due to the still existing limitations of their graphics devices. This leads to a demand to revise and also optimize the graphics standards in order to make them suitable for special embedded and small-scale devices. This paper will present the state of development of OpenGL-ES, a 3D-standard for embedded graphics, its difference to regular OpenGL and its benefit for small-footprint interactive systems. Special aspects of safety-critical devices in avionics and military applications will be discussed. Actual applications and research will be referenced. © 2006 IEEE.

关键词： Embedded systems

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Design and implementation of fuzzy supervisory PI controllers using fuzzy c-means clustering combined with fuzzy gain scheduling for a binary distillation column

Design and implementation of fuzzy supervisory PI controller...

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IEEE Region 10 Conference (TENCON 2005)

作者： Somsung, Kannawat Pratishthananda, Suvalai Department of Process Control and Automation Nakornthai Strip Mill Plc. Chonburi Industrial Estate 20230 Thailand Department of Electrical Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand

ISBN: (纸本)9780780393110

In this paper, fuzzy supervisory PI controllers are developed and implemented on a pilot plant binary distillation column. Fuzzy c-means clustering technique is used in selecting membership functions and fuzzy rules are determined using fuzzy gain scheduling technique. Thus, the need of heuristic method for designing fuzzy membership functions and rules from expert knowledge is omitted. Then, the fuzzy supervisors adapt the parameters of the PI controllers on line. The task of the controllers is to perform dual composition control of the top and bottom products when the disturbances enter the column in the form of changes in feed flow rate. The results show that the fuzzy supervisory PI controllers achieve much better performance than the fixed PI controllers.

关键词： Two term control systems

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Real-time control of a binary distillation column using HGA fuzzy supervisory PI controllers

Real-time control of a binary distillation column using HGA ...

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IEEE Region 10 Conference (TENCON 2005)

作者： Worapradya, Kiatkajohn Pratishthananda, Suvalai Department of Process Control and Automation Nakomthai Strip Mill Plc. Chonburi Industrial Estate 20230 Thailand Department of Electrical Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand

ISBN: (纸本)9780780393110

In this paper, an optimum fuzzy supervisory PI controller using hierarchical genetic algorithms is developed and implemented for controlling the top and bottom product quality of a nonlinear, multi-input multi-output binary distillation column when the disturbance enters the column in the form of the changes in feed How rate. Two conventional PI controllers, one for the bottom product composition and another for the top product composition, are used together in the control scheme. Hierarchical genetic algorithms are used to derive the optimal number and shape of membership functions and fuzzy rules of a fuzzy supervisory system that adapts the parameters of the PI controllers. The real-time implementation results show the effectiveness of the proposed method.

关键词： Distillation columns

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Robust control of a chemical reactor using static output feedback

Robust control of a chemical reactor using static output fee...

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CHISA 2006 - 17th International Congress of Chemical and process engineering

作者： Bakošová, Monika Puna, Dalibor Závacká, Jana Department of Information Engineering and Process Control Institute of Information Engineering Automation and Mathematics Slovak University of Technology in Bratislava Radlinského 9 812 37 Bratislava Slovakia

ISBN: (纸本)8086059456

The paper presents an application of the robust static output feedback control (RSOFC) to an exothermic continuous-time stirred tank reactor (CSTR). The CSTR is an uncertain system, which operates in an unstable steady state. Robust controller design uses a linearized model of the CSTR. Necessary and sufficient conditions for stabilization of linear continuous-time uncertain polytopic systems via static output feedback are given. The problem of the RSOFC design is converted to solution of linear matrix inequalities (LMIs) and a computationally simple LMI based non-iterative algorithm is used. The design procedure guarantees with sufficient conditions the robust quadratic stability and guaranteed cost.

关键词： Robust control

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Individualised approaches in control education courses with large number of students

Individualised approaches in control education courses with ...

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作者： Fikar, M. Valo, R. Čirka, L'. Bakǒová, M. Huba, M. Department of Information Engineering and Process Control Faculty of Chemical and Food Technology STU Radlinského 9 812 37 Bratislava Slovakia Department of Automation and Control Faculty of Electrical Engineering and Information Technology STU Ilkovičova 3 812 19 Bratislava Slovakia

ISBN: (纸本)9783902661074

The aim of this paper is to give an overview about some ideas that have been introduced in past few years to the course Automatic control Fundamentals at FCFT STU. These involve heavy use of information technologies and reduction of repetitive pedagogic work using e-learning techniques for the course with a large number of students. The paper discusses reasons for this change as well as concrete technologies in question. Copyright © 2006 IFAC.

关键词： E-learning

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State-of-the-Art 3D Graphics for Embedded Systems

State-of-the-Art 3D Graphics for Embedded Systems

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IEEE International Caracas Conference on Devices, Circuits and Systems

作者： Reinhard Moller Automation and Process Control Engineering Department of Electrical Information Media Engineering University of Wuppertal Wuppertal Germany

The early days of 3D graphics computing were marked by extremely expensive and highly sophisticated hardware and software. Terms like ubiquitous computing and 3D on handhelds were unthinkable. But the development of obliging common standards like OpenGL, for example, together with rapidly improving graphics technology turned the coin, and now everybody demands for high-performance user interfaces on his everyday-computing environment. Game development industry focuses on mobile technology. Automotive engineering introduces multimodal interfaces and entertainment systems for next generation cars. Although all industrial sectors ask for high performance graphics, they often focus on different aspects due to the still existing limitations of their graphics devices. This leads to a demand to revise and also optimize the graphics standards in order to make them suitable for special embedded and small-scale devices. This paper presents the state of development of OpenGL-ES, a 3D-standard for embedded graphics, its difference to regular OpenGL and its benefit for small-footprint interactive systems. Special aspects of safety-critical devices in avionics and military applications are discussed. Actual applications and research are referenced

关键词： Graphics Embedded system Pervasive computing Hardware Ubiquitous computing Standards development User interfaces Toy industry Automotive engineering Interactive systems

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DYNAMIC ANALYSIS AND control OF CHEMICAL AND BIOCHEMICAL REACTION NETWORKS

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IFAC Proceedings Volumes 2006年第2期39卷 165-170页

作者： Irene Otero-Muras Gábor Szederkényi Antonio A. Alonso Katalin M. Hangos Department of Process Engineering IIM-CSIC Eduardo Cabello 6 36208 Vigo Spain Process Control Research Group Computer and Automation Research Institute H-1518 Budapest P.O.Box 63 Hungary

Metabolic or cell signalling pathways are examples of biochemical networks exhibiting possible complex dynamics in the form of steady-state multiplicity, sustained oscillations or even deterministic chaos. The origin of these nonlinear phenomena is not always well understood, nor it can be systematically predicted beyond a case by case basis. Despite considerable progress in dynamic aspects, efforts are still needed to develop efficient and robust methods of stabilization and control of reaction networks. In this work, we combine concepts and tools from irreversible thermodynamics and systems theory to explore the underlying dynamic properties of a general class of chemical and biochemical networks. Lyapunov and passivity based methods are given for the systematic design of globally stabilizing feedback controllers in both the concentration space and a novel minimal description of the kinetic networks dynamics: the reaction space.

关键词： biochemical reaction networks passivity nonlinear control entropy

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Implementation of Parameter Estimation in Mechanistic Models by Dynamic Optimization

Implementation of Parameter Estimation in Mechanistic Models...

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World Congress on Intelligent control and automation (WCICA)

作者： Xuemei Zhu Rucheng Liu Shuqing Wang College of Electrical and Automation Engineering Nanjing Normal University Nanjing Jiangsu China Institute of Advanced Process Control University of Zhejiang Hangzhou Zhejiang China

The main concern of this paper is the implementation of estimation of time-varying parameters in mechanistic models. A mechanistic model is always a set of nonlinear differential algebraic equations based on basic principles of physics, chemistry, biology etc. by writing down conservation or balance equations. These models usually involve parameters which are time-varying and must be estimated from experimental data or process data. The proposed parameter estimation approach is to minimize the discrepancy between the values of the measured and model simulated outputs. The dynamic optimization is employed due to the time-varying property of estimated parameters. The sequential quadratic programming and orthogonal collocation are used to solve the nonlinear dynamic optimization problem. The approach is verified on a pilot distillation column for estimating tray efficiencies of both the stripping and the rectifying sections and the feed composition

关键词： Parameter estimation Biological system modeling Differential algebraic equations Physics Chemistry Computational biology Writing Nonlinear equations Quadratic programming Dynamic programming

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