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IEEE EUROCON

作者： Petre-Marian Nicolae Ileana-Diana Nicolae University of Craiova Faculty of Electrical Engineering University of Craiova Faculty of Automation Computer Science and Electronics

ISBN: (纸本)9781467322331

The paper analyzes the potential influence of a rectifier fully controlled with thyristors (RFCT) over some components of a power group with static switching. Problems related to the active power flows in distorting and/or non-symmetric regime are briefly presented. Also there are revealed issues related to the influence of non-linear and/or non-symmetric receivers of active powers over the active powers flows along power non-symmetric components when superior harmonics are considered. One presents a complete system with static excitation from a power group. The supplying is made from the power group's main generator terminals, through a power transformer and a RFCT. The electric quantities were recorded with data acquisition systems (DAS) specially designed and made for this application. Based on the acquired recordings one used an original dedicated software based on Fast Fourier Transform (FFT) that allowed the determination of some power quality parameters and the calculation/displaying of (re)active powers' components for each phase and respectively for the significant harmonics (whose weights are over 1%) at the RFCT's input. Analyzing the results one could conclude that the RFCT behaves like a "power converter" for the harmonic and/or non-symmetric powers. An influence of harmonic and non-symmetric powers over some components of the power group could be noticed as well. Experiments certified that these influences result into the shortening of some components' lifetimes, owing to the power flows along the superior harmonics and non-symmetric powers.

关键词： Active power flow Distorting and/or non-symmetrical regimes RFCT Static excitation system Power quality

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Cascade PID control of some processes with distributed parameters through the (Mpdx) method with approximating solutions

Cascade PID control of some processes with distributed param...

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2nd IFAC Workshop on Convergence of Information Technologies and Control Methods with Power Systems, ICPS 2013

作者： Coloşi, T. Abrudean, M. Ungureşan, M.L. Mureşan, V. Department of Automation Technical University of Cluj-Napoca Faculty of Automation and Computer Science 26-28 Gh. Baritiu Street 400027 Cluj-Napoca Romania Department of Physics and Chemistry Technical University of Cluj-Napoca Faculty of Materials Science and Engineering 103-105 Muncii Street 400641 Cluj-Napoca Romania

ISBN: (纸本)9783902823328

Continuing the paper (2013) the analogical modeling and the numerical simulation of a cascade PID control diagram from Fig.1 is presented, containing two distributed parameters processes, each one modeled through an equation with partial derivatives of second order with two independent variables. Through the numerical integration, the method of the Matrix of Partial Derivatives of the State Vector (Mpdx) is used too, associated with approximating solutions. The unitary and systemized character of this method is highlighted, considered known from the previous papers. (2009,2011,2013). Like in the case of paper [1], a program of numerical simulation for the entire PID cascade control scheme was elaborated, resulting a more complete phenomenological interpretation of the obtained results and performances. © IFAC.

关键词： Ordinary differential equations

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Choosing characteristics of hardware-software systems for word intelligibility of speech scoring

Choosing characteristics of hardware-software systems for wo...

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International Forum on Strategic Technology, IFOST

作者： Ivanov Andrey Valerievich Trushin Victor Aleksandrovich Faculty of Automation and Computer Engineering Novosibirsk State Technical University Novosibirsk Russia

The article is about hardware and software systems, dedicated for word intelligibility of speech scoring. Following characteristics for procedure and equipment for word intelligibility of speech scoring are reviewed: width of frequency range, which is analyzed, its' frequency partition (bandpass filter choice), measured values' dynamic range, measurements' accuracy. Experiment was performed in order to determine the frequency range width required for analysis. According to experiment results optimal width of frequency range, required for correct discrete word intelligibility valuing, was chosen. Frequency range partitioning was researched. Partitioning is suggested to be rendered correspondingly to human acoustic organ sensitivity. Requirements of choice measuring equipment are suggested. Structural configuration of software and hardware systems are given, including alternative ADC mountings, uses of logarithmic preamp, analogue or software bandpass filter.

关键词： Ear

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Long-term hemispheric variation of the flare index

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Research in Astronomy and Astrophysics 2013年第3期13卷 343-350页

作者： Song Feng Lin-Hua Deng Shi-Chun Xu Computer Technology Application Key Lab of Yunnan Province and Faculty of Information Engineering and Automation Kunming University of Science and Technology Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences National Astronomical Observatories / Yunnan Astronomical Observatory Chinese Academy of Sciences University of Chinese Academy of Sciences Kunming Institute of Physics

The long-term hemispheric variation of the flare index is investigated. It is found that, （1） the phase difference of the flare index between the northern and southern hemispheres is about 6-7 months, which is near the time delay between flare activity and sunspot activity; （2） both the dominant and phase-leading hemisphere of the flare index is the northern hemisphere in the considered time interval, implying that the hemispheric asynchrony of solar activity has a close connection with the N-S asymmetry of solar activity.

关键词： Sun： activity -- Sun： flares -- methods： data analysis

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Fields of applications for hybrid online labs

Fields of applications for hybrid online labs

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International Conference on Remote engineering and Virtual Instrumentation (REV)

作者： K. Henke St. Ostendorff H.-D. Wuttke St. Simon Faculty of Computer Science and Automation Integrated Communication Systems Group Ilmenau University of Technology Ilmenau Germany Computer Engineering at the Faculty of Computer Science and Automation Ilmenau University of Technology Ilmenau Germany

Based on a grid concept of an interactive hybrid online laboratory we will describe different fields of applications in different learning scenarios. The infrastructure is based on a universal grid concept which guaranties a reliable, flexible as well as robust usage of this online lab. By using the REAL online lab, students are able to design control algorithms with different specification techniques to control electro-mechanical models in the online lab. Additionally, the reconfigurable rapid prototyping platform of the REAL system can be used to test all the taught topics of a given lectures in the field of digital system design. Finally, a special demonstration platform (a ball in a labyrinth on a balance plate) can be used to give the students a better feeling about the possibilities and limitations of remote control and observation via Internet and to evaluate these technologies critically. The implemented online lab infrastructure is based on the iLab architecture of the MIT, which allows to interconnect online labs and to exchange remote lab experiments among different universities worldwide.

关键词： Algorithm design and analysis Visualization Laboratories Internet Educational institutions Field programmable gate arrays Control systems

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MOF Compliant Fundamentals for Multi-Domain System Modeling and Simulation

MOF Compliant Fundamentals for Multi-Domain System Modeling ...

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IEEE International Systems Conference

作者： Tino Jungebloud Sven Jager Ralph Maschotta Armin Zimmermann System and Software Engineering Group Faculty of Computer Science and Automation Ilmenau University of Technology

ISBN: (纸本)9781467331074

Modern software frameworks for Model-Based Systems engineering (MBSE) methodologies are proprietary and commonly restricts to a poor choice of domain specific languages. Furthermore, the interoperablity and model interchange support between frameworks is a technically hard challenge. The industrial strength standard OMG MOF (Meta-Object Facility) is a solid approach for the definition of domain specific languages. Applying meta-modeling techniques to existing modeling and simulation frameworks reduces obscurity of proprietarity and implicitely language characteristics. On the other hand, standard compliance improves product openness/transparency, reliability and confidence as for primary modes of operation. This paper presents a methodology to incorporate methods of meta-modeling and standard compliant domain specific languages in an existing modeling and simulation framework. First results are emerged and exemplified for an effective modeling dialect called MML (MLDesigner Modeling Language). Future prospects reviews already accomplished goals in this project, address several alternatives and improvements and gives an overview of ongoing development.

关键词： Unified modeling language Computational modeling Grammar Educational institutions Standards Metamodeling

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Model-Based QoS Evaluation for Embedded Wireless Sensor Networks

Model-Based QoS Evaluation for Embedded Wireless Sensor Netw...

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IEEE International Systems Conference

作者： Sven Jager Tino Jungebloud Ralph Maschotta Armin Zimmermann System and Software Engineering Group Faculty of Computer Science and Automation Ilmenau University of Technology

ISBN: (纸本)9781467331074

Wireless sensor network technologies can be used for industrial embedded system design to save cabling cost and weight. However, their environment, architecture, and design issues are quite different from original sensor network applications. Simulation tools and system design environments have to be adapted to the special requirements, such as operational modes and phases which influence the system. This paper presents a more detailed wireless sensor network to check against the application requirements concerning QoS, reliability, and lifetime. An avionics application example is presented.

关键词： Wireless sensor networks Quality of service Embedded systems operational mode embedded system design Phase avionics embedding simulation tool Environments

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Application of tool-specific simulation algorithms to Memristor models written in Modelica

Application of tool-specific simulation algorithms to Memris...

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2013 European Conference on Circuit Theory and Design, ECCTD 2013

作者： Majetta, Kristin Clauß, Christoph Schmidt, Torsten Tetzlaff, Ronald Fraunhofer Institute for Integrated Circuits IIS Design Automation Division EAS Dresden Germany Ansbach University of Applied Sciences Ansbach Germany Technical University Dresden Faculty of Electrical and Computer Engineering Dresden Germany

ISBN: (纸本)9783000437854

In 2008 a physical device that contained a layer of titanium dioxide located between platinum electrodes became known as the HP-Memristor. Many models of this device, in different degrees of abstraction, were presented in the literature. This paper describes the simulation of some of these models, written in the object oriented language Modelica, with different numerical algorithms and gives an overview of their efficiency and stability. © 2013 TU Dresden.

关键词： Memristors

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A Framework for Agile Development of Simulation-Based System Design Tools

A Framework for Agile Development of Simulation-Based System...

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IEEE International Systems Conference

作者： Ralph Maschotta Sven Jager Tino Jungebloud Armin Zimmermann System and Software Engineering Group Faculty of Computer Science and Automation Ilmenau University of Technology

ISBN: (纸本)9781467331074

Analysis and validation using simulation is a helpful tool in systems engineering, but requires in-depth knowledge of various aspects of the system itself, the used model class(es), an appropriate software tool, and sometimes software engineering. Usually, this expertise is spread over a number of team members, and thus the development of a simulation-based system design tool is not a simple task. This paper presents a framework enabling the rapid development of extensible and reusable simulation-based applications. It supports an agile, iterative, evolutionary, and architecture-centric software development process. The design of the framework together with its components as well as the corresponding software development process is described. As an example, an environment for the configuration and analysis of wireless sensor network applications in the aeronautic domain is presented, which has been designed and implemented based on the proposed environment.

关键词： Agile Development System Design Model Based Systems engineering Validation MLDesigner Wireless Sensor Network Simulation System design Wireless sensor networks Frameworks EXPANDABLE Software Tools PROCESS DEVELOPMENT Software design computer software

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Rate control and flight stabilization for a quadrotor system

Rate control and flight stabilization for a quadrotor system

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International Conference on Unmanned Aircraft Systems (ICUAS)

作者： Benjamin Jahn Alexander Barth Kai Wulff Tobias Simon Jan Römisch Control Engineering Group Computer Science and Automation Faculty Ilmenau University of Technology Ilmenau Germany Integrated Communication Systems Group Computer Science and Automation Faculty Ilmenau University of Technology Ilmenau Germany

In this paper we propose a stability augmentation system for a quadrotor, enabling direct rate control for a human pilot. Our system includes feedforward for rate control, feedback for disturbance attenuation, and an online optimization technique for handling input restrictions. We show that the proposed algorithms are able to stabilize the system under highly challenging flight conditions, such as wind gusts and fast manual descend. Our input restriction technique ensures that the revolution speeds for the desired torques are feasible. The complete control system is analyzed using MATLAB, and full experimental validation is provided based on a quadrotor prototype.

关键词： Mathematical model Torque Actuators Angular velocity Equations Feedforward neural networks Stability analysis

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