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Short primary linear drive designed for synchronous and induction operation in different sections

IET ELECTRIC POWER APPLICATIONS 2014年第6期8卷 209-220页

作者： Fernandes Neto, Tobias Rafael Mutschler, Peter The Pontes, Ricardo Silva Univ Fed Ceara Dept Elect Engn Fortaleza Ceara Brazil Tech Univ Darmstadt Dept Power Elect & Control Drives Darmstadt Germany

The potential for very long tracks, multiple vehicles travelling at high speed, high positioning repeatability and rapid acceleration turns the short primary linear drive into a good candidate for use in material transfer and processing lines. To implement this system, the linear motor was designed for synchronous and induction operation, since the costs can be considerably reduced by using a simple induction rail at the long transporting sections, instead of permanent magnets. This study is focused on the vehicle motion control strategy of a short primary linear drive, in order to regulate the speed without jerks. The implemented control algorithm for both the operations is based on a field oriented control, which uses a moving AB-reference frame. The position information was obtained by using a magneto-resistive incremental encoder, which was mounted on the vehicle, and a magnetic linear scale, which was installed along the passive track. Furthermore, force generation which depends on the vehicle's position will be discussed. Finally, experimental tests are performed to demonstrate the feasibility of the employed control strategy.

关键词： MOTION control devices INDUCTION motors LINEAR induction motors programmable controllers ELECTROMECHANICAL devices

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Sliding mode synchronization controller design with neural network for uncertain chaotic systems

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CHAOS SOLITONS & FRACTALS 2009年第4期39卷 1856-1863页

作者： Chen Mou Jiang Chang-sheng Jiang Bin Wu Qing-xian Nanjing Univ Aeronaut & Astronaut Coll Automat Engn Nanjing 210016 Peoples R China

A sliding mode synchronization controller is presented with RBF neural network for two chaotic systems in this paper. The compound disturbance of the synchronization error system consists of nonlinear uncertainties and exterior disturbances of chaotic systems. Based on RBF neural networks, a compound disturbance observer is proposed and the update law of parameters is given to monitor the compound disturbance. The synchronization controller is given based on the output of the compound disturbance observer. The designed controller can make the synchronization error convergent to zero and overcome the disruption of the uncertainty and the exterior disturbance of the system. Finally, an example is given to demonstrate the availability of the proposed synchronization control method. (C) 2007 Elsevier Ltd. All rights reserved.

关键词： programmable controllers SLIDING mode control SYNCHRONIZATION NEURAL networks (Computer science) CHAOS theory NONLINEAR theories STOCHASTIC convergence DESIGN & construction

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Compaction of test response at self-testing in the programmable logic matrices

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AUTOMATION AND REMOTE CONTROL 2013年第2期74卷 264-274页

作者： Aksenova, G. P. Russian Acad Sci Trapeznikov Inst Control Sci Moscow Russia

Consideration was given to a controllable architecture enabling easy, simple and prompt self-testing in the programmable logic matrix. An approach was proposed to reduce the amount of self-testing hardware by compacting the test response by mod 2 convolution schemes through reconfiguration of the subject of diagnosis programmed in the matrix and using its standard connections.

关键词： programmable controllers COMPACTING AUTOMATIC test equipment RELIABILITY (Engineering) SELF-testing (Computer science) FIELD programmable gate arrays

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IEC 61131 and DSDM in real-time process control applications

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COMPUTING & CONTROL ENGINEERING JOURNAL 2002年第2期13卷 94-100页

作者： Barritt, D Wessex Water Eng. Services Bath UK

Wessex Water is one of the smallest of the privatised UK water companies, covering an area of 10 000km(2) and serving 2-4 million customers. This article outlines the way in which IEC 61131 and the dynamic systems development method have been adopted for use in developing real-time control systems for complex water treatment plants. Some conclusions are drawn regarding the benefits of this approach, which might be of interest to other practitioners and researchers.

关键词： Control applications in other natural resources Software engineering techniques Wessex Water water treatment programmable logic controllers dynamic systems development method DSDM international standard process control water supply IEC 61131 real-time systems Public utilities software engineering IEC standards water treatment plants Environmental issues water companies programmable controllers Control engineering computing real-time process control

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A Real-Time Temperature Data Transmission Approach for Intelligent Cooling Control of Mass Concrete

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MATHEMATICAL PROBLEMS IN ENGINEERING 2014年第1期2014卷 1-10页

作者： Lin, Peng Li, Qingbin Jia, Pinyu Tsinghua Univ State Key Lab Hydrosci & Engn Beijing 100084 Peoples R China

The primary aim of the study presented in this paper is to propose a real-time temperature data transmission approach for intelligent cooling control of mass concrete. A mathematical description of a digital temperature control model is introduced in detail. Based on pipe mounted and electrically linked temperature sensors, together with postdata handling hardware and software, a stable, real-time, highly effective temperature data transmission solution technique is developed and utilized within the intelligent mass concrete cooling control system. Once the user has issued the relevant command, the proposed programmable logic controllers (PLC) code performs all necessary steps without further interaction. The code can control the hardware, obtain, read, and perform calculations, and display the data accurately. Hardening concrete is an aggregate of complex physicochemical processes including the liberation of heat. The proposed control system prevented unwanted structural change within the massive concrete blocks caused by these exothermic processes based on an application case study analysis. In conclusion, the proposed temperature data transmission approach has proved very useful for the temperature monitoring of a high arch dam and is able to control thermal stresses in mass concrete for similar projects involving mass concrete.

关键词： CONCRETE cooling TEMPERATURE sensors programmable controllers THERMAL stresses DATA transmission systems COMPUTER input-output equipment

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A Comprehensive Evaluation of PID, Cascade, Model-Predictive, and RTDA controllers for Regulation of Hypnosis

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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 2009年第12期48卷 5719-5730页

作者： Sreenivas, Yelneedi Yeng, Tian Woon Rangaiah, G. P. Lakshminarayanan, S. Natl Univ Singapore Dept Chem & Biomol Engn Singapore 117576 Singapore

Although manual control of anesthesia is still the dominant practice during surgery, an increasing number of studies have been conducted to investigate the possibility of automating this procedure. Several clinical studies that compare closed-loop to manual anesthesia control performance have been reported. These studies used proportional-integral-derivative (PID) controllers, as well as model-based controllers. However, there is a need for a comprehensive evaluation of closed-loop systems, to establish their safety, reliability, and efficacy for anesthesia regulation. This requires a detailed evaluation of promising and/or recent controllers for a range of patients and conditions via simulation. The present study investigates the performance of single-loop PID, cascade, model-predictive, and RTDA (Robustness, set;point Tracking, Disturbance rejection, Aggressiveness) controllers for closed-loop regulation of hypnosis using isoflurane with bispectral index (BIS) as the controlled variable. Extensive simulations are performed using a model that simulates patient responses to the drug, surgical stimuli, and unexpected surgical events. Results of this comprehensive evaluation show that model-predictive and RTDA controllers provide better regulation of BIS, compared to the other controllers tested.

关键词： ANESTHESIA programmable controllers SURGERY AUTOMATIC control HYPNOTISM ISOFLURANE PREDICTION models SIMULATION methods & models

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Online fuzzy identification for an intelligent controller based on a simple platform

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ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE 2009年第4-5期22卷 628-638页

作者： Blazic, Saso Skrjanc, Igor Gerksic, Samo Dolanc, Gregor Strmcnik, Stanko Hadjiski, Mincho B. Stathaki, Anna Univ Ljubljana Fac Elect Engn Ljubljana 1000 Slovenia Jozef Stefan Inst Ljubljana 1000 Slovenia UCTM Sofia Sofia Bulgaria Comp Technol Inst Athens Greece

The paper presents the identification issues of the self-tuning nonlinear controller ASPECT (Advanced control algorithmS for programmable logiC controllers). The controller is implemented on a simple PLC platform with an extra mathematical coprocessor, but is intended for the advanced control of complex processes. The model of the controlled plant is obtained by means of experimental modelling. A special batch-wise algorithm that is based on the Takagi-Sugeno model and uses "fuzzy instrumental variables" technique is described in the paper. Many robustness problems of the classical adaptive approaches can be circumvented to some extent by the proposed batch-wise approach combined with a supervisory mechanism. The paper also includes some experimental results on the hydraulic pilot plant and some simulation case studies. (C) 2009 Elsevier Ltd. All rights reserved.

关键词： Fuzzy identification programmable controllers Online learning Nonlinear control systems pH neutralisation process

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Enhanced Control of Unstable Cascade Processes with Time Delays Using a Modified Smith Predictor

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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 2009年第6期48卷 3098-3111页

作者： Uma, S. Chidambaram, M. Rao, A. Seshagiri Natl Inst Technol Dept Chem Engn Tiruchirappalli 620015 Tamil Nadu India

This paper presents a simple cascade controller in the enhanced modified Smith predictor structure for control of open loop unstable cascade processes with/without zero. The proposed structure consists of two control loops, a secondary inner loop and a primary outer loop. The method has totally three controllers of which the secondary loop has one controller and the primary loop has two controllers. The secondary loop controller is designed using the internal model control (IMC) technique. The primary loop set point tracking and disturbance rejection controllers are designed using the direct synthesis method. The primary set point tracking controller is designed as a proportional, integral, and derivative (PID) controller with lag filter and the primary disturbance rejection controller is designed as a PID with lead-lag filter. Simulation studies have been carried out on various cascade unstable processes with/without zero. The present method gives significant disturbance rejection both in the inner and outer loops. Also, the proposed method shows significant improvement when compared to the recently reported methods in the literature.

关键词： PROCESS control PID controllers TIME delay systems programmable controllers PREDICTIVE control SIMULATION methods & models CHEMICAL engineering DESIGN & construction

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A simple adaptive-feedback controller for chaos synchronization

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CHAOS SOLITONS & FRACTALS 2009年第1期39卷 316-321页

作者： Guo, Wanli Chen, Shihua Zhou, Hong Wuhan Univ Sch Math & Stat Wuhan 430072 Peoples R China Wuhan Univ Dept Automat Wuhan 430072 Peoples R China

Based oil the LaSalle's invariant theorem and Lyapunov method, a simple scheme is proposed to synchronize chaotic systems. Unlike the usual linear feedback, this scheme uses the variable feedback which is automatically adapted to a updated law. Moreover, this scheme is analytical and simple to be implemented in practice. The well-known models such as Chen system and Lu system are used to illustrate the validity of this theoretic method. (C) 2007 Elsevier Ltd. All rights reserved.

关键词： programmable controllers ADAPTIVE control systems FEEDBACK control systems CHAOS theory SYNCHRONIZATION INVARIANTS (Mathematics) LYAPUNOV functions MATHEMATICAL models

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programmable Logic Controller Forensics

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IEEE SECURITY & PRIVACY 2017年第6期15卷 18-24页

作者： Ahmed, Irfan Obermeier, Sebastian Sudhakaran, Sneha Roussev, Vassil Univ New Orleans Comp Sci New Orleans LA 70148 USA ABB Software Zurich Switzerland Univ New Orleans Dept Comp Sci New Orleans LA 70148 USA Univ New Orleans Dept Comp Sci New Orleans LA 70148 USA

programmable logic controllers (PLCs) automate the control and monitoring of physical industrial and infrastructure processes such as power generation, gas pipelines, and water management. Due to the convergence of networking infrastructure, PLCs can be exposed to cyberattacks over the network with potentially catastrophic consequences. This article introduces the basic mechanisms by which various attacks can be detected, analyzed, and ultimately remedied.

关键词： Integrated circuits Process control programmable logic devices Digital forensics Computer crime Monitoring SCADA INSPEC: Controlled Indexing digital forensics programmable controllers INSPEC: Non-Controlled Indexing programmable logic controller forensics PLCs control automation monitoring automation physical industrial infrastructure processes power generation gas pipelines water management networking infrastructure cyberattacks attack detection Author Keywords programmable logic controller industrial control system ICS forensics cyberattack SCADA digital forensics

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