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Plant uncertainty contribution to QFT Tracking control design 4

Plant uncertainty contribution to QFT Tracking control desig...

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4th IFAC Symposium on Robust control Design, ROCOND 2003

作者： Martínez, G.-M. Sanz, G.-M. System Engineering and Automation Group Electrical Engineering Department University of La Rioja Luis de Ulloa. 20 Logrono26004 Spain Automatic Control and Computer Science Department Public University of Navarra Campus Arrosadia s/n Pamplona31006 Spain

Tracking feedback control trade-offs increase dangerously with arbitrarily large uncertainties in the process mode!. This is shown by the bounds in the QFT domain. In this context, the paper develops a theory on the contribution of the plant uncertainty to the tracking QFT bounds through a serious study of tracking bound formulas. From this, a methodology for uncertainty fragmentation is developed. It hopes to loosen the bound toughness, or the control design trade-offs. Better feedback benefits can be achieved while reducing the high-frequency amplification of noises and disturbances at the plant input at the same time. Different QFT controllers in a controller-scheduler structure should drive different uncertainty boundaries. © 2003 IFAC.

关键词： Robust control

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Robust tracking performance enhancement through uncertainty division

Robust tracking performance enhancement through uncertainty ...

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2003 European control Conference, ECC 2003

作者： Gil-Martínez, M. García-Sanz, M. System Engineering and Automation Group Electrical Engineering Department University of La Rioja Luis de Ulloa 20 Logroño26004 Spain Automatic Control and Computer Science Department Public University of Navarra Campus Arrosadía s/n Pamplona31006 Spain

ISBN: (纸本)9783952417379

When the process uncertainty size increases, even linear minimum phase systems must sacrifice desirable aggressive feedback control benefits to avoid an excessive 'cost of feedback', while preserving the robust stability. With a suitable uncertainty division and a QFT controller-prefilter to command each uncertainty subset inside a controller-scheduler structure, it is possible to enhance the feedback tracking performance without an excessive bandwidth. To preserve the robust stability from any failure in the switching, each controller is designed to be stable in the whole uncertainty domain, and as accurate in command tracking as desired in its uncertainty subset. © 2003 EUCA.

关键词： Robust control

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An ROI image coding based on switching wavelet transform

An ROI image coding based on switching wavelet transform

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： S. Fukuma S. Ikuta M. Ito S. Nishimura M. Nawate Department of Electronic and Control System Engineering Shimane University Matsue Shimane JAPAN

We propose a region-of-interest (ROI) image coding based on the switching wavelet transform. In order to relax the restriction for the allocation of information quantity between ROI and region-of-non-interest (non-ROI), we employ a wavelet transform with shorter length basis for ROI, and a longer length wavelet with better compression performance for non-ROI. Moreover, we present a method of allocation of information quantity for the switching wavelet that can control the ratio of the restored image quality for ROI to that for non-ROI under a given total information quantity. Our method can avoid information loss for non-ROI at lower bitrate in JPEG-2000, therefore subjective image quality for the whole of the restored image is improved, maintaining the quality of ROI to be higher than that of non-ROI.

关键词： Image coding Wavelet transforms Image restoration Image quality Bit rate Wavelet coefficients Shape Indium tin oxide control systems systems engineering and theory

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Improved algorithms for reducing estimated error produced by sample quantization and additional noise

Improved algorithms for reducing estimated error produced by...

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SICE Annual Conference

作者： H. Kubota K. Watanabe K. Kubo Postgraduate course of Electronic System Engineering Oyama National College of Technology Japan Department of Electronic Control Engineering Oyama National College of Technology Japan

Prony's method and binary method are evaluated for estimating sine-wave frequency, and are investigated from standpoints of error behavior in the frequency estimate. Since these methods are based on samples of sine-wave, the estimation is influenced by quantization. New technique is proposed to reduce the estimation error influenced both by the quantization and by additional noise in samples. By implementing this technique, higher accuracy in frequency estimation is achieved.

关键词： Quantization Noise reduction Frequency estimation Sampling methods Educational institutions Signal to noise ratio systems engineering and theory Testing FAA

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Anti-sway system for boom cranes based on an optimal control approach

Anti-sway system for boom cranes based on an optimal control...

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American control Conference (ACC)

作者： E. Arnold O. Sawodny A. Hildebrandt K. Schneider Fraunhofer Application Center Systems Technology Ehrenberg Germany Institute of Automation and System Engineering Department of Control Engineering Technische Universität Illmenau Germany

For the operation of boom cranes a significant high level of experience is needed to achieve a large amount of handled containers. Therefore, automation systems with anti-sway abilities for boom cranes were developed to increase the handling rate especially for inexperienced crane operators. In the paper, an optimal control approach is presented as an alternative to feedback control systems. After deriving the nonlinear dynamic model, the anti-sway problem is formulated as a nonlinear constrained optimal control problem. The numerical solution method for this optimal control problem is presented. The results are illustrated at measurements for the harbour mobile crane LIEBHERR LHM400.

关键词： Cranes Optimal control Feedback control Differential equations Shape control control systems automation State feedback Costs Nonlinear dynamical systems

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Knowledge Reengineering and Reusing Based on Ontology in Online Organizational Discussion

Knowledge Reengineering and Reusing Based on Ontology in Onl...

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International Conference on control and automation (ICCA)

作者： Hongxia Gao Xiaoji Zhou Ruwei Dai LCSIS Institution of Automation Chinese Academy and Sciences Beijing China Department of System Engineering Institute of China Electronic Technology Corporation Beijing China

Hall for Workshop of Metasynthetic engineering (HWME), a newly burgeoning GDSS based on web, supplies an organizational decision situations supported by online resources (analysis and computing tools, information from web, etc.) and aims at making decision on problems related to Open Complex Giant systems(OCGS). This paper focuses on the knowledge reengineering and reusing in online organizational discussion in HWME To facilitate knowledge reengineering knowledge ontologies based on roles and functions in online organizational discussion is analyzed deeply. Then, a new method of knowledge reengineering and reusing based on roles and functions in online organizational discussion is proposed. To illustrate the structure of ontologies, we give a suppositional example of macroeconomics forecasting designed by economists.

关键词： Ontologies Problem-solving Decision making automation systems engineering and theory Aerospace engineering Macroeconomics Economic forecasting Humans Collaboration

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Component-based constructing approach for application specific embedded operating systems

Component-based constructing approach for application specif...

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International Conference on Intelligent Transportation

作者： Zhu Li-xin Wang Fei-yue Intelligent Control and System Engineering Center Automation Institute of Chinese Academy of Sciences Beijing China Department of Systems & lndustrial Engineering University of Arizona Tucson Tucson USA

ISBN: (纸本)0780381254

Rapid advances in the real-time embedded operating systems necessitate the development of Internet oriented application specific embedded operating systems. The ASOS (application specific embedded operating systems) has now become a promising research direction of the embedded operating system. The paper clarifies the concept of the ASOS, and takes the embedded operating system applied in the traffic signal controller we are now developing to illustrate the main characteristics of the ASOS. Benefits from the CBSE (component-based software engineering) include system quality improvement, shorter time to market, integration of complex systems, etc. However, as for the embedded system, the component-based technology and theories still in an exploration period, though many projects are carried on. In this paper, we present the process of our approach to construct the ASOS based on the component technology.

关键词： Operating systems Embedded system Application software Hardware systems engineering and theory Intelligent transportation systems Real time systems Internet control systems Software quality

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An infeasibility degree selection based genetic algorithms for constrained optimization problems

An infeasibility degree selection based genetic algorithms f...

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system Security and Assurance

作者： Mu, Sheng-Jing Su, Hong-Ye Chu, Jian Wang, Yue-Xuan Natl. Lab. of Indust. Cntr. Technol. Inst. of Adv. Process Control Zhejiang University Yuquan Campus Hangzhou 310027 China Natl. CIMS Engineering Res. Center Inst. of System Integration Department of Automation Beijing 100084 China

ISBN: (纸本)0780379527

In this paper, a genetic algorithm based on Infeasibility Degree (IFD) selection is proposed for constrained optimization problems. Initial solutions and intermediate solutions are allowed to be feasible as well as infeasible as penalty function methods. The infeasibility degree of a solution (IFD) is defined as the sum of the square value of all the constraints violation and the infeasibility degree selection of the population is designed through checking whether the IFD of a solution is less than or equal to a threshold value or not to decide the candidate solution is acceptable or refusable. The method is divided into two stages: first, initial IFD selection is carried out to produce enough initial feasible solution;then the GAs based on Annealing IFD selection is applied to search for the feasible optimum solution. Two selected problems are used to test the algorithm performance.

关键词： control system analysis

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Single switch DC-DC converter operating in CC and DC modes

Single switch DC-DC converter operating in CC and DC modes

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SICE Annual Conference

作者： K. Tripipatpornchai Y. Rungruengphalanggul A. Chaisawadi Department of Electrical and Electronic Engineering Faculty of Engineering Rangsit University Pathum Thani Thailand Department of Control System and Instrumentation Engineering Faculty of Engineering King Mongkut''s University of Technology Thonburi Bangkok Thailand

ISBN: (纸本)0780383524

This paper proposes a direct current buck converter which provides two independent regulated direct current output voltages using only single control switch. The first converter operation is based upon the use of continuous conduction mode (CCM) to regulate output voltage by controlling the duty cycle of the switch, while the second converter operation is based upon the use of discontinuous conduction mode (DCM) to regulate output voltage by controlling the duty cycle and changing the switching frequency. The system's operation is verified by results from computer simulation and experimentation from the prototype in this experiment, the switching frequency range is from 4 kHz to 90 kHz and the duty cycle range is from 20% to 42%. The overall efficiency of this converter is approximately 83% at full load.

关键词： Switches DC-DC power converters Switching converters Buck converters Inductors Voltage control Equations Switching frequency Circuits control systems

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On an explicit expression to compute H/sup /spl infin// norm of symmetric systems

On an explicit expression to compute H/sup /spl infin// norm...

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American control Conference (ACC)

作者： Lixin Gao Anke Xue Youxian Sun Wenzhou Norm College Institute of System Science Wenzhou Zhejiang China National Laboratoly of Industrial Control Technology University of Zhejiang Hangzhou China Automation Department Hangzhou Institute of Electronics Engineering Hangzhou China

ISBN: (纸本)0780378962

In this paper, an explicit expression to compute H/sup /spl infin// norm, which is recently obtained for continuous-time state-space symmetric systems by using a particular solution of the bounded real lemma for a symmetric system, is extended to more general case of continuous-time symmetric systems and also to discrete-time symmetric systems. The computations of H/sup /spl infin// norm only need to compute the maximum eigenvalue of a symmetric matrix, which only contains the system matrices.

关键词： Symmetric matrices Matrix decomposition Eigenvalues and eigenfunctions Open loop systems Singular value decomposition Linear matrix inequalities Riccati equations control system synthesis Output feedback Sun

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