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International Conference and Exposition on Electrical and Power engineering (EPE)

作者： Catalin Damian Eduard Lunca Mircea Ilinca Faculty of Electrical Engineering Technical University of Iasi Romania Faculty of Automatic Control and Computer Engineering Technical University of Iasi Romania

This paper presents a combination of programming languages and web technologies used to deploy a modern remote controlled system. The hardware part of the system is a parallel port interface board that contains different types display devices, user-input components and some relays. The system functionality is based on some software applications developed using different techniques: the communication between the parallel interface, local computer and webserver PC is based on standard C, the user interface is developed using php, mysql, html and javascript technologies. Users can access full resources of the system if they are registered or only some demonstration and training sections as guest users.

关键词： Hardware IP networks computers Databases Ports (computers) Software Servers

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Correction of the on-off control system using PLC

Correction of the on-off control system using PLC

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International Scientific Conference on Electric Power engineering (EPE)

作者： Miroslaw Wcislik Michal S. Laskawski Faculty of Electric Engineering Automatic Control and Computer Science Kielce University of Technology Kielce Poland

ISBN: (纸本)9781509064076

The paper deals with an analysis of features of on-off controllers. It was assumed that the control quality can be described by three distinctive indexes: the period, the amplitude and the mean value of the controlled signal in the steady state. The on-off controller with positive hysteresis was a basic form of the controller that was analyzed. To eliminate the disadvantages of this basic form the controller structure was augmented by inertia corrector. Its impact on mentioned above indicators was shown and described. To compensate the negative influence of inertia corrector on the mean value of the controlled signal, an additional proportional corrector was proposed. Its influence on control quality was shown and discussed. To show how easy it is to build the proposed structure of the controller, its exemplary implementation in the ladder logic language of the S7-1200 PLC was described.

关键词： control systems Hysteresis Steady-state Oscillators Mathematical model Software packages Computational modeling

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Level Fuzzy control of Three-Tank System

Level Fuzzy Control of Three-Tank System

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International Conference on control Systems and computer Science (CSCS)

作者： Lucian Mastacan Constantin-Catalin Dosoftei Faculty of Automatic Control and Computer Engineering Gheorghe Asachi Technical University of Iasi Iasi Romania

ISBN: (纸本)9781467361408

Look-up decisions tables are favorites in fuzzy control when a complex algorithm of fuzzy rules inference is an impediment for a real time application. The control values of look-up tables are fuzzy singletons in finite number. It is difficult to obtain the best fuzzy control performance in these conditions. The look-up tables can be assimilated to sparse fuzzy rule bases. A linear interpolation method applied in a look-up decision table increase to a large number the fuzzy control values. In this way the fuzzy control performance can be improved. A level fuzzy control of three-tank system is implemented to validate the proposed method.

关键词： Fuzzy control Fuzzy logic Interpolation Process control Table lookup Tuning Pragmatics

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CANopen implementation using BCP protocols over TIA-485 in networked embedded systems

CANopen implementation using BCP protocols over TIA-485 in n...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Mihai Postolache Faculty of Automatic Control and Computer Engineering “Gheorghe Asachi” Technical University of Iasi Iasi Romania

CAN (controller Area Network) and TIA-485 are two of the most used standards in fieldbus systems. While CAN ISO IS-11898 includes complete data link layer specifications on top of its physical layer, TIA-485 only addresses the physical layer of the 7-layer OSI model. Other communication parameters like speed, format, and data transmission protocol are not specified by RS-485 in order to provide interoperability of similar devices from different manufacturers. After a brief introduction and comparison of the two communication protocols, the paper investigates to what extent the CANopen specification - an application level protocol developed primarily for CAN networks - should be used in TIA-485-based fieldbus networks in order to provide the user an application programming interface (API) independent of the physical layer. Selected and customized CANopen services have been implemented and tested on a network of microcontroller-based stations equipped with CAN ISO 11898 and TIA-485 communication interfaces.

关键词： Standards Monitoring Synchronization Servers Embedded systems Media Access Protocol

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Chaotic behavior of new nonlinear electromagnetic microgenerator harvesting energy from mechanical vibrations

Chaotic behavior of new nonlinear electromagnetic microgener...

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International Symposium on Electrical Machines (SME)

作者： Mariusz Jagieła Marcin Kulik Faculty of Electrical Engineering Automatic Control & Computer Science Opole University of Technology Opole Poland

A low-frequency nonlinear cantilever-beam-type electromagnetic vibration energy harvester is analyzed. The nonlinearity brought into system kinematics by the “magnets-on-magnets” action provides approximately 20 Hz frequency bandwidth. A simulation study based on solution of coupled dynamic equations of motion and equation of electric balance shows that within major part of the bandwidth the system is capable to produces the voltage with magnitude proportional to magnitude and frequency of the excitation force. At very low frequency and large external forces it falls, however into region where it exhibits chaotic behavior. In this paper the impact of the phenomenon on waveform of the generated voltage is analyzed using the Poincare maps and spectrograms. The results prove a detrimental impact of the phenomenon on overall performance of the system. In order to avoid the chaotic operation the impact of the hard-stop barriers of relative displacement is analyzed showing rise of generated power and reduction of a low-frequency limit of the bandwidth.

关键词： Magnetic flux Force Magnetic resonance Magnetic hysteresis Magnetic cores Coils Magnetic circuits

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Logic synthesis method for combinatorial blocks using a FPGA-like basic cell structure

Logic synthesis method for combinatorial blocks using a FPGA...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Călin-Mircea Monor Automatic Control and Computer Engineering Faculty “Gheorghe Asachi” Technical University Iasi România

The paper presents a method for completing the logic synthesis stage of the design flow applied to a FPGA-like technology. The method presented is focused on combinatorial blocks included into the design, as the propagation delay associated to these blocks influences the performance of the future chip directly. It has to be said that the method presented in this paper is a heuristic technique, starting from the structure of the basic cell in a FPGA-like technology. The dedicated optimization tools perform the synthesis are using a library of simple logic functions, then run an algorithm for packing as many gates from the output netlist as possible using the physical resources of the technology.

关键词： Table lookup Logic functions Registers Propagation delay Clocks Field programmable gate arrays Input variables

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Real-time inter-process communication in heterogeneous programming environments

Real-time inter-process communication in heterogeneous progr...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Adrian Alexandrescu Andrei Stan Nicolae-Alexandru Botezatu Simona Caraiman Faculty of Automatic Control and Computer Engineering “Gheorghe Asachi” Technical University of Iasi Iasi Romania

ISBN: (纸本)9781509027217

In a complex real-time application, each module can be independently developed, therefore, different processes need to communicate with each other safely and as quickly as possible. This paper proposes a flexible and efficient solution for handling the inter-process communication and for helping the programmer to quickly create modules that use the producer-consumer paradigm in order to streamline the data flow between the different processes. The communication is performed by means of a first-in first-out circular buffer which is kept in a shared memory area in order to allow quick data transfer between modules. The proposed solution allows the development of complex modularized applications suitable for real-time data processing. We describe the use of the proposed framework in a practical setup practice to as part of a software synchronization mechanism between two acquisition devices: a video capture device and an inertial measurement unit.

关键词： Real-time systems Libraries computer languages Pipelines Operating systems Sockets computers

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Real-Time Communication Model for IoT Systems

Real-Time Communication Model for IoT Systems

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Federated Conference on computer Science and Information Systems (FedCSIS)

作者： Stanisław Deniziak Mirosław Płaza Łukasz Arcab Faculty of Electrical Engineering Automatic Control and Computer Science Kielce University of Technology Kielce Poland

Internet of Things solutions typically involve interaction between sensors, actuators, the cloud, embedded systems and user applications. Often in such cases, there are time constraints specifying the maximum response time to a request. This time depends on the calculation time and transmission time. Existing Internet communication solutions do not ensure the implementation of transmissions in a way that guarantees meeting the set time constraints. This paper proposes a new model of Internet communication dedicated to real-time Internet of Things systems, which includes a communication protocol, as well as a transmission scheduling and routing method. The protocol takes into account information about transmission time constraints, which is used for packet scheduling by routers, allowing to increase quality of service. In addition, the proposed static routing mechanism makes it possible to parallelize transmissions if time constraints are still exceeded. Also presented are preliminary results of experiments showing to what extent the proposed methods allow improving the quality of service in real-time Internet of Things systems.

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Implementation of software changes in programming techniques learning

Implementation of software changes in programming techniques...

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International Conference and Exposition on Electrical and Power engineering (EPE)

作者： Catalin Damian Mircea Ilinca Faculty of Electrical Engineering Technical University of Iasi Romania Faculty of Automatic Control and Computer Engineering Technical University of Iasi Romania

This paper presents a study about how efficient implementation of software changes helps students to better understanding of programming techniques and algorithms. The study is performed during last three years on first year students, considering applications classes for two first year courses: computer programming part I and part II. There are taken into account some partial results during the semester, final exams and also some questionnaires accomplished by students. The ratings for this study are imported from a database. The study is regarding around eight hundred students.

关键词： Education Programming profession Mathematical model Encoding computer languages Software

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Modelling, Adaptive, Neural and Fuzzy control of Coal Power Plants 1

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IFAC Proceedings Volumes 1995年第26期28卷 347-352页

作者： Petr Pivoňka Department of Automatic Control and Instrumentation Faculty of Electrical Engineering and Computer Science 61266 Brno Božetěchova 2 Czech Republic

At the preparatory stage for connecting the Czech power systems to the West European UCPTE system, corrections for frequency must be included in the output power control, i.e. the primary control must be introduced. The result of the detailed analysis was a model of primary output power control of the block and a new power system control of Czech coal power plants. In the new power system control, an adaptive or robust controller will be used for operation stabilisation

关键词： Power system control adaptive control neural control fuzzy control fuzzy PID controllers self-tuning control neural nets

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