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Application of a genetic algorithm in triangulation of a 3-D object surface

International Journal of computers and Applications 2000年第2期22卷 73-77页

作者： Zhenyu, Chen Mbede, J.B. Yan, Zhou Dehua, Li Hanping, Hu State Commn. Res. Open Lab. Image P. Inst. Pattern Recog. Artif. Intell. Huazhong Univ. of Sci. and Technol. 430074 Wuhan China Intelligent Contr. and Robotics Lab. Dept. of Contr. Sci. and Engineering Huazhong Univ. of Sci. and Technol. 430074 Wuhan China Second Artillery Institute Huazhong Univ. of Sci. and Technol. Inst. Pattern Recog. Artif. Intell. Huazhong Univ. of Sci. and Technol. Second Artillery Institute China Wuhan University China Artificial Intelligence Department University of Edinburgh Inst. of AI and Pattern Recognition Huazhong Univ. of Sci. and Technol. China Cogn. Sci. Natl. Key Found. Res. P. Douala University Cameroon Tübingen University Germany Automatic Control Laboratory Darmstadt University Department of Service Cameroon Min. of National Education Robotics Laboratory Huazhong Univ. of Sci. and Technol. Wuhan China Assoc. Connectionnistes These-ACTH Rennes France IEEE Soc. of Robotics and Automation IEEE Society of Control Systems IASTED Assoc. Jeunes Chercheurs Robotique France Navy University of Engineering China Huazhong Univ. of Sci. and Technol. China Department of Computer Science Airforce Radar Acad. of Engineering China Inst. of P.R and AI Huazhong Univ. of Sci. and Technol.

This paper proposes a genetic-based algorithm for surface reconstruction of three-dimension (3-D) objects from a group of contours representing its section plane lines. The algorithm can optimize the triangulation of the surface of 3-D objects with a multi-objective optimization function to meet the needs of a wide range of applications. Further, a new crossover operator for triangulation and a new 3-D quadrilateral mutation operator are also introduced.

关键词： Object recognition

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Qualitative diagnostic toolbox employing propagation models

Qualitative diagnostic toolbox employing propagation models

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1999 European control Conference, ECC 1999

作者： Kavcic, M. Juricic, D. Department of Computer Automation and Control J. Stefan Institute Jamova 39 Ljubljana1000 Slovenia

ISBN: (纸本)9783952417355

The main motivation of the presented work is to realise a prototype of the CAD tool that supports the whole life cycle of the diagnostic system development process. In the proposed approach, the fault trees are automatically derived from component models. The automatic synthesis incorporates the feedback control loop structure. Fault trees are then transformed into diagnostic rules. The implemented CAD tool allows for rule processing by using the Transferable Belief Model (TBM). The limitations of the component-based synthesis of fault trees are discussed. © 1999 EUCA.

关键词： computer aided design

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Grey box process modelling for fault detection and isolation

Grey box process modelling for fault detection and isolation

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1999 European control Conference, ECC 1999

作者： Hangos, K.M. Szederkenyi, G. Systems and Control Laboratory Computer and Automation Research Institute HAS PO Box 63 BudapestH-1518 Hungary

ISBN: (纸本)9783952417355

The effect of the type and quality of process models applied for fault detection and isolation is investigated in this paper. It is shown that the level of details and the modelled processes within the applied grey box model determine the detectability of the faults as well as the sensitivity and detection delay of a particular fault detection method. The concepts and results are illustrated on the example of fault detection of heat exchange surface deterioration and leaking in a countercurrent heat exchanger. © 1999 EUCA.

关键词： Fault detection

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automation of specification process for PLC control systems software

Automation of specification process for PLC control systems ...

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International Conference on Emerging Technologies and Factory automation (ETFA)

作者： M. Rihar G. Godena Department Computer Automation and Control Jozef Stefan Institute Ljubljana Slovenia

The specification process for advanced industrial process control systems should be conducted by means of a methodology that takes into consideration the specification of control functions and the system architecture. For the domain of industrial process control by PLCs, we have implemented the automation of the specification process within a pragmatic low-cost and easy to use CASE environment, comprising commercial computer tools extended by a dedicated software. Such an environment makes possible domain-oriented non-redundant data entry, automatic data expansion and transfer into the CASE tool repository, and remains an advantage of CASE tool generic functions.

关键词： automation Programmable control Automatic control Process control control systems computer aided software engineering Electrical equipment industry Industrial control computer architecture computer industry

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Model-based fault diagnosis of an actuator system driven by the brushless DC motor

Model-based fault diagnosis of an actuator system driven by ...

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American control Conference (ACC)

作者： O. Moseler D. Juricic A. Rakar N. Muller Institute of Automatic Control Laboratory of Control Engineering and Process Automation Darmstadt University of Technology Darmstadt Germany Department of Computer Automation and Control Jozef Stefan Institute Ljubljana Slovenia

A fault detection and isolation scheme for a brushless DC motor driving a mechanical actuation system is presented. First, a detailed mathematical model of the drive is derived. The residual generator is based on parity relations while the fault isolation part is implemented by means of the transferable belief model. The problem of distinguishing between faults with the same fault signatures is addressed. It is shown that additional improvements in terms of resolution can be achieved by employing parameter estimation. The proposed FDI scheme is tested on the actual drive under various faults. The achieved performance features the highest resolution, diagnostic stability and accuracy.

关键词： Fault diagnosis Actuators Brushless DC motors DC motors Coils Rotors Stators Fault detection Pulse width modulation Mathematical model

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Adaptive implementation of Wiener model based nonlinear predictive control

Adaptive implementation of Wiener model based nonlinear pred...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： S. Gerksic D. Juricic S. Strmcnik Department of Computer Automation and Control Jožef Stefan Institute Ljubljana Slovenia

This paper discusses issues of model adaptation in a Wiener model based nonlinear predictive control (WNPC). WNPC is an extension of state-space generalized predictive control with a Wiener model. It combines the advantages of predictive control with the ability to control highly nonlinear processes, while retaining a moderate level of computational demand. It is aimed at a class of nonlinear processes that can be described with a Wiener structure. Model adaptation is required when the process is affected by nonmeasurable disturbances that severely affect the nonlinear characteristics of the system. It is shown that better disturbance rejection performance can be achieved at the cost of an increased computational demand, and that robust tuning of the estimator is a difficult problem. The method is evaluated with a pH neutralisation process case study.

关键词： Programmable control Adaptive control Predictive models Predictive control Adaptation model Process control control systems Robustness Industrial control automation

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Estimation of constant parameters in a class of time varying plants by means of smoothing

Estimation of constant parameters in a class of time varying...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： D. Juricic Department of Computer Automation and Control Jožef Stefan Institute Ljubljana Slovenia

The problem addressed in this paper is as follows. Consider a nonlinear discrete time system with parameters, which can be a priori classified into two groups: constant parameters and time varying ones. It is also assumed that loose attributes like "slow" or "fast" express the only prior information concerning the dynamics of varying parameters. The question of interest is how to estimate the constant parameters of the process (on the basis of a recorded batch of input and output data) so that possible alterations of the parameters that are expected to vary with time are taken into account. To deal with this kind of nonlinear fixed-interval smoothing problem a two-level procedure based on rectangular window technique and Gauss-Newton method is presented. All the computations are performed offline. The procedure is applicable in a pre-processing stage of adaptive parameter estimation where the parameters that are evidently time invariant are identified from past records. Thus the number of parameters that have to be tracked (i.e. estimated) on-line is reduced. The efficiency of the scheme is illustrated on a simulated industrial process.

关键词： Parameter estimation Smoothing methods Bellows Raw materials Noise measurement Time measurement automation Automatic control Discrete time systems Time varying systems

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Qualitative diagnostic toolbox employing propagation models

Qualitative diagnostic toolbox employing propagation models

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European control Conference (ECC)

作者： M. Kavčič D. Juričić Department of Computer Automation and Control J. Stefan Institute Jamova 391000 Ljubljana Slovenia

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A multithreaded Java microcontroller for thread-oriented real-time event-handling

A multithreaded Java microcontroller for thread-oriented rea...

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International Conference on Parallel Architecture and Compilation Techniques (PACT)

作者： U. Brinkschulte C. Krakowski J. Kreuzinger T. Ungerer Institute of Process Control Automation and Robotics University of Karlsruhe Karlsruhe Germany Institute of Computer Design and Fault Tolerance University of Karlsruhe Karlsruhe Germany

We propose a multithreaded Java microcontroller (called Komodo microcontroller) with a new hardware event handling mechanism that allows handling of simultaneous overlapping events with hard real-time requirements. Real-time Java threads are used as interrupt service threads (ISTs) instead of interrupt service routines (ISRs). Our proposed Komodo microcontroller supports multiple ISTs with zero-cycle context switching overhead. We evaluate the basic architectural attributes using real-time event parameters of an autonomous guided vehicle. When calculating the maximum vehicle speed without violating the real-time constraints, ISTs dominate ISRs by a speed increase of 28%.

关键词： Java Microcontrollers Switches Embedded system Yarn Application software Real time systems Hardware Multithreading Process control

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A toolbox for model-based fault detection and isolation

A toolbox for model-based fault detection and isolation

引用

1999 European control Conference, ECC 1999

作者： Tesar, L. Berec, L. Dolanc, G. Szederkenyi, G. Kadlec, J. Juricic, D. Hangos, K. Kinnaert, M. Institute of Information Theory and Automation AV CR P.O.B. 18 Prague 8182 08 Czech Republic Department of Theoretical Biology Institute of Entomology AV CR Branišovská 31 České Budějovice370 05 Czech Republic Department of Computer Automation and Control J. Stefan Institute Jamova 39 LjubljanaSI 1001 Slovenia Computer and Automation Research Institute MTA P.O.B. 63 BudapestH-1518 Hungary Laboratoire d'Automatique et d'Analyse des Systèmes Université Libre de Bruxelles CP 165/55 50 Av. F.D. Roosevelt BrusselsB-1050 Belgium

ISBN: (纸本)9783952417355

A toolbox for model-based fault detection and isolation (FDI) has been developed in the MATLAB/SIMULINK environment. It includes methods relying on analytical or qualitative models of the supervised process. A demonstration of each approach can be performed on a simulation of either a three-tank system, a cocurrent or a countercurrent heat exchanger. The results are displayed in a common format, which allows performance comparison. A user manual including guidelines for tuning method specific parameters is available. © 1999 EUCA.

关键词： computer aided software engineering

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