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A Self-tuning PID controller Based on Expert System

IFAC Proceedings Volumes 2001年第22期34卷 511-515页

作者： Xing Jianchun Wang Ping Wang Lin Research Institute of Control and Measurement of Nanjing Engineering Institute 210007 Nanjing Jiangsu P.R.China

This paper introduces a PID controller with self-tuning function. It may provide optimal PID control parameters. The self-tuning algorithm based on the expert system and pattern recognition has quick convergence speed through the application of the new characteristic variables and the distinctive pre-tuning formulae. The uniformed self-tuning formula is also presented, which makes it easy to implement and maintain the expert system based on the single chip micro-processor.

关键词： PID control error criteria control algorithms expert system

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Computerization of metallurgical production as the means for solution of the energy-saving and ecological safety tasks

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IFAC Proceedings Volumes 2001年第21期34卷 63-66页

作者： S.A. Vlasov A.L. Genkin N.G. Volochyok Institute of Control Sciences Moscow Russia

Energy-saving and ecological safety of the metallurgical processes have been in the focus of the ever growing attention recently. The use of computer and information technologies for solving these problems is logical for two reasons. First, the modem computers and the computerized control systems using them can solve these problems if they are specified as criteria of the functioning of these systems. Second, various new technological processes, facilities, systems and complexes contributing to the solution of the energy-saving and ecological safety problems are developed and start already being marketed, and yet their use is not conceivable without modern computer and information technologies. The paper is concerned with example of using computer simulation for decision of problem of energysaving in "steel-rolling mill" complexes.

关键词： computer simulation energy-saving steel-rolling complexes control efforts control algorithms

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Estimation of Thickness Variation Due to Skid Mark Using Speedometer

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IFAC Proceedings Volumes 2001年第18期34卷 41-45页

作者： Young Kow Lee Sang Woo Kim Sung Eun Jo Sung Chul Hong Electrical and Computer Engineering Division Pohang University of Science and Technology (POSTECH) Pohang 790-784 Republic of Korea Technology laboratory POSCO

In the hot steel rolling process, the Feed-Forward AGC (FF AGC) method controls the roll gap by estimating the skid mark of the previous stand exit thickness. Skid mark filtering is very important and difficult in the FF AGC process. In this paper, we introduce the conception of the FF AGC and propose an adaptive filtering method for the skid mark. The proposed method considers the types of materials, the final objective thickness and the roll speed. The performance of the proposed skid mark filter is shown and the performance improvement of the FF AGC method is shown via simulation.

关键词： Feedforward control control algorithms Filter design Adaptive filters Neural networks Radial base function networks

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Characteristics of closed loop power control algorithms for a cellular DS/CDMA system.

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IEE PROCEEDINGS-COMMUNICATIONS 1998年第5期145卷 355-362页

作者： Sim, ML Gunawan, E Soh, CB Soong, BH Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore

The authors consider the performance of a reverse link DS/CDMA system with fast closed loop power control algorithms. For power control purposes, the received signal-to-interference ratio (SIR) must be measured. A simple procedure is proposed for estimating received SIR which does not need much calibration. The result shows that the BER performance is sensitive to the feedback delay or the inverse of the power control updating frequency. The power control mechanism is effective provided that the power control command updating frequency is ten times higher than the Doppler frequency. A step-size of 2 dB for the single step-size power control algorithm is found to be optimal for the mobile unit's velocity, which is uniformly distributed in the range 0-100 km/h. It was also found that the BER performance is very sensitive to the power control command channel error rate in the range 10(-1)-10(-2) This suggests that the system designer should concentrate on minimising this error to improve the overall performance. Lastly, if a multiple step-size power control algorithm is to be implemented, two power control command bits would perform better than one, three, or more bits in a mobile channel environment.

关键词： power control control algorithms cellular DS/CDMA systems

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A generic event control framework fbr modular flexible manufacturing systems

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COMPUTERS & INDUSTRIAL ENGINEERING 2000年第1期38卷 107-123页

作者： Park, JH Park, JW Kim, JW Georgia Inst Technol Sch Ind & Syst Engn Atlanta GA 30332 USA Seoul Natl Univ Dept Ind Engn Seoul South Korea Seoul Natl Univ Sch Mech & Aerosp Engn Seoul South Korea

A generic event control framework is presented for a class of modular flexible manufacturing systems (FMSs). A modular FMS is characterized as a set of flexible workstations inter-connected by a material handling system consisting of a transporter and a stocker. Many of the existing FMS implementations in industry fall into this class. Furthermore, the modularity also allows the capability to effectively model a complex FMS by decomposing it into several modular FMSs. In order to achieve reconfigurability of control system for various FMS implementations and control policies, the proposed control framework is defined as a set of distributed resource controllers and a central system supervisor coordinating them. The resource controllers are further classified into workstation, transporter, and stocker controllers. As the controllers exchange a series of events according to pre-defined protocols, they are modelled as event handlers in which control actions are made based on the event occurrences. Specifically, for each controller, an event-based control structure specified in terms of generic logical and performance control functions, is presented. Since the proposed framework is defined by the use of the interacting distributed processes with the well-defined protocols and computationally efficient algorithms, it is expected that the framework is easily implementable for most industrial FMSs. Finally, the performance and reconfigurability is demonstrated by the distributed simulation from which we can also verify the correctness of the proposed algorithms. (C) 2000 Elsevier Science Ltd. All rights reserved.

关键词： flexible manufacturing system control algorithms event control

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control methods for three-phase active power filters under non-ideal mains voltages

Control methods for three-phase active power filters under n...

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International Conference on Power System Technology (POWERCON 2000)

作者： Machmoum, M Bruyant, N Large GE44 F-44602 St Nazaire France

ISBN: (纸本)0780363388

In this paper, the control algorithms for three-phase three-wired shunt active power filter under distorted or unbalanced mains voltages conditions are analysed. According to the compensation objectives, a direct method, based on the power balance concept is used and compared to the standard pq algorithm. It allows to impose systematically sinusoidal mains currents in phase with the balanced symmetrical positive sequence system of the supply voltages in spite of mains or load asymmetries. Simulation and experimental results are presented to validate the proposed algorithm and to prove the effectiveness of the design and control strategy.

关键词： harmonics imbalance reactive power control algorithms compensation shunt active filter

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DSP based control of shunt active power filters for global or selective harmonics compensation

DSP based control of shunt active power filters for global o...

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9th International Conference on Harmonics and Quality of Power

作者： Machmoum, M Bruyant, N LARGE GE44 F-44602 St Nazaire France

ISBN: (纸本)0780364996

This paper presents the study of a shunt active power filter which compensates all or a specified mains current harmonics generated by a typical non-linear load. The control is mixed and use a digital signal processor (DSP TMS320C40). it allows to test and validate easily different current or DC voltage control algorithms. A fundamental positive detector is realised to enlarge the working of the well known pq algorithm to several asymmetries conditions taken into account time delays. The system is investigated analytically as well. as experimentally. The obtained results are presented and discussed to prove the effectiveness of the design and control strategy.

关键词： shunt active filter DSP control algorithms harmonics compensation

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Intelligent methodology for sensing, modeling and control of pulsed GTAW: Part I - Bead-on-plate welding

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WELDING JOURNAL 2000年第6期79卷 151S-163S页

作者： Chen, SB Lou, YJ Wu, L Zhao, DB Harbin Inst Technol Natl Key Lab Adv Welding Prod Technol Harbin 150006 Peoples R China

This study addresses intelligent techniques for Fulfilling quality control of bead-on-plate welding. A new visual double-sided sensing system capable of imaging the weld pool topside and backside simultaneously in a frame was provided to determine the weld pool geometry parameters. The imaging principle was analyzed with spectrum distribution, in which the weld pool was illuminated by are light emission to receive a clear image under base current. Double-sided size parameters describing weld pool geometry were defined and determined in real time with the developed image processing algorithm. The influences of welding parameters such as pulse duty ratio and travel speed on weld bead geometry were identified by step response. Based on the analysis, a neural network model of the dynamic process was established for predicting the backside width with the welding parameters and topside size parameters. The simulation results indicated the accuracy of the model, and the characteristics of the welding process were analyzed carefully. Aiming at the bead-on-plate pulsed GTAW process, conventional and intelligent control methods of single input and single output were investigated, and the neuron self-learning PSD control was verified with better performance for practical application through comparisons.

关键词： bead-on-plate welding control algorithms computer vision double-sided sensing fuzzy logic neural network model pulsed GTAW

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Constraint Logic Programming Approach for Dynamic Traffic Signal control

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IFAC Proceedings Volumes 2000年第17期33卷 897-902页

作者： Kelwyn D'Souza Tomasz Borowiecki Zbigniew Banaszak School ofBusiness Hampton University Hampton Virginia 23668 U.S.A. Department of Computer Science and Management Technical University of Zielona Gora Zielona Gora Poland

This paper presents the application of Constraint Logic Programming as a potential approach to model traffic flow at signalised intersections and reduce the computational burden of control algorithms utilised in traffic controllers. A traffic controller was modelled to detect congested intersections in an arterial network and select revised signal plans to avoid further congestion. The control algorithm searches for admissible signal plans by exploring constraints which must be satisfied by the solution. The search time for the algorithm is reduced through the mechanism of constraint propagation and distribution.

关键词： Centralised control constraint satisfaction problems controllers control algorithms real-time systems signal processing algorithms traffic control

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A control System Processor Architecture for Complex LTI controllers

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IFAC Proceedings Volumes 2000年第6期33卷 175-180页

作者： Roger Goodall Simon Jones Rene Cumplido-Parra Fiona Mitchell Stephen Bateman Department of Electronic & Electrical Engineering Loughborough University Loughborough Leics. LE11 3TU. UK Gatefield Corporation USA

The paper describes the use of FPGA-type devices for implementing complex, high sample rate, linear time invariant controllers. The overall methodology involves re-formulating the controller into a particular discrete state-space representation, which is optimised for numerical efficiency, then programming this into a specially-designed control System Processor (CSP) implemented using a “programmable ASIC” device.

关键词： control algorithms Architectures Arithmetic and logic units control applications Hardware

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