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Upgraded sinusoidal beam chopping system at CYRIC

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 2005年第1-3期538卷 218-224页

作者： Terakawa, A Tanigaki, M Itoh, K Fujita, M Shinozuka, T Orihara, H Tohoku Univ Ctr Cyclotron & Radioisotope Sendai Miyagi 9808578 Japan

The sinusoidal beam chopping system installed in the neutron time-of-flight (TOF) beam line at CYRIC was upgraded during the construction of the new K I 10 AVF cyclotron. In order to achieve high stability of the RF phase under easy control, a new low-level RF electronics was designed and built using a direct digital synthesizer (DDS). The new control system for the beam chopper was also developed on the basis of programmable logic controllers (PLC). The performance tests were successfully carried out with proton beams from the cyclotron. The present beam chopping system has covered a wide dynamic range from 325.5 to 1000 ns for neutron TOF measurements at CYRIC. (C) 2004 Elsevier B.V. All rights reserved.

关键词： sinusoidal beam chopping system RF control programmable logic controller neutron TOF

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Indirect adaptive control of a two-wheeled vehicle with low-resolution input and output

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ADVANCED ROBOTICS 2005年第4期19卷 349-371页

作者： Konaka, E Suzuki, T Okuma, S Nagoya Univ Grad Sch Engn Chikusa Ku Nagoya Aichi 4648603 Japan

The programmable logic controller (PLC) is widely used in the industrial world, e.g. in manufacturing, chemical processing, materials handling, etc. The PLC-based control system can be regarded as a control system with low-resolution inputs and outputs. This paper presents a sophisticated control policy which can enhance the control performance for such a class of control system even if the complete information of the plant is not available. In particular, the case of existing uncertainty or perturbations in the input matrix is addressed. The key contribution of this paper is to clarify the identifiability condition for parameters included in the input matrix from measured low-resolution inputs and outputs. This investigation leads to the development of an indirect adaptive control policy with low-resolution inputs and outputs. Finally, the proposed indirect adaptive control policy is applied to the line-following control of a two-wheeled vehicle and its usefulness is demonstrated through experiment.

关键词： programmable logic controller low-resolution inputs and outputs hybrid systems indirect adaptive control two-wheeled vehicle

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Software safety analysis of function block diagrams using fault trees

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RELIABILITY ENGINEERING & SYSTEM SAFETY 2005年第3期88卷 215-228页

作者： Oh, Y Yoo, J Cha, S Son, HS Korea Adv Inst Sci & Technol Dept Elect Engn & Comp Sci Taejon 305701 South Korea IIRTRC SPIC AITrc Taejon 305701 South Korea Korea Atom Energy Res Inst I&C & HF Team Taejon South Korea

As programmable logic controllers (PLCs) are often used to implement safety-critical embedded software, safety demonstration of PLC code is needed. In this paper, we propose a fault tree analysis technique on Function Block Diagrams (FBDs) which is one of the most widely used PLC programming languages. FBD is currently being used to develop Reactor Protection System (RPS) for a nuclear power plant in South Korea. Our approach to fault tree analysis, which combines fault-oriented and cause/effect-oriented viewpoints, is easy to understand and offers systematic guidelines to ensure safety of PLC code. Domain experts found the approach to be useful through a case study on RPS, and this paper compares completeness and comprehensiveness of the semi-automatically generated fault trees using the proposed approach against the one manually prepared by nuclear safety engineers. (c) 2004 Elsevier Ltd. All rights reserved.

关键词： safety analysis fault tree analysis function block diagram programmable logic controller

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Control freaks

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POWER ENGINEER 2005年第3期19卷 36-39页

作者： Unver, HM Celik, V Kirikkale Univ Dept Elect & Elect Engn Kirikkale Turkey Gazi Univ Dept Elect & Elect Engn Ankara Turkey

The induction furnace has been used in a massive range of applications from heating, melting and welding to shrink-fitting, forming, soldering and even plasma physics. Furnaces operate at frequencies between 10 Hz to 60 MHz, and as a result, different power supplies - operating at different frequencies - have also been developed. Induction steel heating furnaces (ISHF) have several advantages in practical applications. However, when a material is heated within an ISHF, its resistivity and magnetic permeability fluctuate, which proves detrimental to the control of power within the furnace. One way to improve power control within an ISHF is to use a programmable logic controller (PLC). Indeed, modern PLCs are modular, affordable, have large memory capacities, and also have special functions such as pulse wave modulation (PWM) and data communication. Using a PLC not only eases position, temperature and pressure control within the ISHF, but also provides overvoltage and overcurrent protection. A new PLC control system design allows heating to take place at constant power while maintaining a steady resonance frequency. The article introduces the system.

关键词： power control Power system protection Process heating Spatial variables control induction steel heating furnaces PLC overvoltage protection overcurrent protection forming melting Power applications in metallurgical industries PWM memory capacity programmable logic controller programmable controllers position control temperature control Pressure and vacuum control plasma physics Power and energy control shrink-fitting pressure control induction heating pulse wave modulation data communication electric furnaces logic controller induction furnace resonance frequency Thermal variables control constant power welding programmable controllers soldering heating

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Reducing environmental swings with a recurrent neural network control system

Reducing environmental swings with a recurrent neural networ...

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8th IASTED International Conference on Intelligent Systems and Control

作者： Skrivan, S Zhang, J Jusak, D Western Washington Univ Dept Comp Sci Bellingham WA 98225 USA

ISBN: (纸本)0889865175

Maintaining environmental stability in a dynamic system is often a very important task for a control system. Swings in environmental conditions can be harmful to equipment and cause inefficiencies in the system. These swings are present throughout our lives, in your living room for example, when you set the thermostat to 68 degrees the actual temperature cycles above and below 68 degrees. This project uses a Recurrent Neural Network (RNN) in an Aquarium Control System to reduce the swings in temperature, ph level, and conductivity. The results of testing the online system and simulations show that the RNN does reduce these swings.

关键词： intelligent control systems artificial intelligence Recurrent Neural Networks programmable logic controller CORBA and Aquarium Control System

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Optimal design of sensor parameters in PLC-based control system using mixed integer programming

Optimal design of sensor parameters in PLC-based control sys...

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17th Workshop on Circuits and Systems

作者： Konaka, E Mutou, T Suzuki, T Okuma, S Nagoya Univ Grad Sch Engn Nagoya Aichi 4648603 Japan

programmable logic controller (PLC) has been widely used in the industrial control. Inherently, the PLC-based system is a class of Hybrid Dynamical System (HDS) in which continuous state of the plant is controlled by the discrete logic-based controller. This paper firstly presents the formal algebraic model of the PLC-based control systems which enable the designer to formulate the various kinds of optimization problem. Secondly, the optimization problem of the 'sensor parameters,' such as the location of the limit switch in the material handling system, the threshold temperature of the thermostat in the temperature control system, is addressed. Finally, we formulate this problem as Mixed logical Dynamical Systems (MLDS) form which enables us to optimize the sensor parameters by applying the Mixed Integer Programming.

关键词： programmable logic controller sensor parameter optimization mixed integer programming

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DEVELOPMENT OF PLC COURSES FOR PRACTICING CONTROL ENGINEERS IN MACEDONIAN INDUSTRY

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IFAC Proceedings Volumes 2005年第1期38卷 46-51页

作者： Tatjana Kolemishevska-Gugulovska Mile Stankovski Sonja Andonova Institute of ASE at Faculty of EE St. Cyril and Methodius University MK-1000 Skopje Republic of Macedonia German Agency for Technical Cooperation (GTZ) Skopje RM

The ASE Institute Skopje, Institute of Automation and Computer Based Systems Engineering at EE Faculty of SS Cyril and Methodius University, has had a close collaboration with the respective company of Siemens in Macedonia. In Skopje, for some time the GTZ Centre aimed at enhancing technology transfer has been established. Within its scope and program of activities, we have created a dedicated centre within ASE Institute and developed special courses on PLC based automation in cooperation with the Siemens in Macedonia. In this paper we present our results and the current state of the matters on our special endeavours to contribute to combined knowledge and technology as well as training skills transfer to practicing control engineers in our country. Also, we put forward some recommendations on this trend in the conclusion.

关键词： Technology transfer programmable logic controller education course development knowledge transfer

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AN IMPLEMENTATION OF A TELEOPERATED ROBOT CONTROL ARCHITECTURE ON A PLC AND FIELD-BUS BASED PLATFORM

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IFAC Proceedings Volumes 2005年第1期38卷 349-354页

作者： F. Ortiz B. Álvarez F. Losilla D. Rodríguez N. Ortega Universidad Politécnica de Cartagena División de Sistemas e Ingeniería Electrónica Campus Muralla del Mar s/n. Cartagena E-30202 Spain IZAR Carenas Cartagena Ctra. De la Algameca s/n. E-30205 Cartagena Spain

Teleoperated robots are used to perform hazardous tasks that human operators cannot carry out. The purpose of this paper is to present a new architecture (ACROSET) for the development of these systems that takes into account the current advances in robotic architectures while adopting the component-oriented approach. ACROSET provides a common framework for developing this kind of robotized systems and for integrating intelligent components. The architecture is currently being used, tested and improved in the development of a family of robots, teleoperated cranes and vehicles which perform environmentally friendly cleaning of ship-hull surfaces (the EFTCoR project). This paper summarises the features of this project and describes the implementation of ACROSET on a hardware platform based on a PLC ( Programmed logic controller) SIEMENS SIMATIC S7-300 and the Field-Bus PROFIBUS DP.

关键词： Architecture programmable logic controller Field-Bus teleoperation robot

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REMARKS ON IMPROVING OF OPERATION SPEED OF THE PLCs

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IFAC Proceedings Volumes 2005年第1期38卷 44-49页

作者： Mirosław CHMIEL Edward HRYNKIEWICZ Adam MILIK Institute of Electronics Silesian University of Technology Akademicka 16 44-100 Gliwice Poland

The paper presents two different approaches to optimising operation speed of programmable logic controllers. First approach optimizes architecture of the CPU and the program execution. It shows the two processors bit-byte architecture which support of concurrent execution of bit and byte computation tasks. Second approach bases on hardware implemented control algorithm in reconfigurable platform based on FPGA. In second solution high performance is achieved by fully concurrent hardware execution of algorithm. Specific implementation tools enables typical PLC programming for hardware target platform.

关键词： programmable logic controller Central Processing Unit Bit-Byte Structure of CPU Control Program Scan Time Throughput Time Reconfigurable logic controller programmable logic Devices Field programmable Gate Arrays Parallel Processing

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RAPID PROTOTYPING OF SEQUENTIAL controllerS WITH PETRI NETS

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IFAC Proceedings Volumes 2005年第1期38卷 397-402页

作者： Philipp Orth Alexander Bollig Dirk Abel Institute of Automatic Control RWTH Aachen University D-52056 Aachen Germany

This paper focuses on the possibilities of a Petri net based rapid control prototyping (RCP) tool chain. P/T nets extended by interfaces and connected to an extended state model allow the description of typical programmable logic controller tasks. After a general introduction to RCP, the method is applied to the area of sequential control, and code generation for the chosen model is depicted. The paper closes with an example for a tool chain, demonstrated by system simulation and Software-in-the-Loop for a subsystem of a flexible manufacturing system in an industrial fieldbus environment.

关键词： discrete-event systems Petri nets hybrid modelling simulation prototyping programmable logic controller sequential control

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