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Set-up of active magnetic bearings for control of flexible shaft

AIP Conference Proceedings 2018年第1期2029卷

作者： Adam Piłat Bartosz Sikora Jan Klocek Jan Cieślik 1AGH University of Science and Technology Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering Department of Automatic Control and Robotics Mickiewicza 30 30-059 Krakow Poland 2Optister Jalowcowa 50 31-329 Krakow Poland 3AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Department of Manufacturing Systems Mickiewicza 30 30-059 Krakow Poland

This paper presents the new laboratory test rig of the vertical axis flexible shaft supported by two active magnetic bearings. Behind the motivation of establishing this setup is the control of vibration modes of the flexible rotor - shaft assembly, while the rotational speed varies and the unbalanced mass on the whirling disc is introduced to the system. The proposed model is aimed to simulate real operation conditions of the rotating machinery with an applied external load, with a variable structure caused by a change of material properties of the rotor - shaft assembly, or due to a fault of some elements coupled with the rotor.

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A compact size signal conditioning circuit for thermocouple linearization and amplification for industrial IoT devices

A compact size signal conditioning circuit for thermocouple ...

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Roedunet International Conference (RoEduNet)

作者： Dumitru Cristian Trancă Daniel Rosner Adrian Surpăţeanu Miroljub T. Pešić Automatic Control and Computer Science Faculty University Politehnica of Bucharest Faculty of Electronic Engineering University of Niš Serbia

As the Industrial Internet of Things evolves, ever more data acquisition devices are integrated inside factories, silos, agriculture facilities, industrial facilities, cars and many other applications. One of the most common measured parameter, that also creates the most problems in specific applications, is temperature. There is an abundance of analog temperature transducers, available for engineers and researchers, with varying precision, temperature range, linearity, power consumption, and cost. Besides invasive temperature sensors and transducers, in recent years microwave based temperature measurement methods have been developed. The current paper presents one method of reading thermocouples without the need of a high resolution ADC or digital calculation of complex polynomial functions. The article is focused on the linearization circuit, measurement results, errors and presents a short application using NI WSN nodes as part of IIoT.

关键词： Temperature measurement Temperature sensors Voltage measurement Junctions Temperature distribution Measurement uncertainty

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Achieving better recommendations with overclassification: Practical considerations

Achieving better recommendations with overclassification: Pr...

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

作者： Onofrei George Archip Alexandru Faculty of Automatic Control and Computer Engineering “Gheorghe Asachi” Technical University of Iasi România

ISBN: (纸本)9781509027217

With the growth of the Internet, recommendations have become a fact of life and there is a big competition between companies to get as much market share as possible. This is achievable not only through fast to market solutions but also by constantly providing high quality services. Considering the speed of current technological advancements, it is impossible to conceive a world without some form of prediction. Traditionally, recommendations have been computed using the collaborative filtering method, but the growth of available information has pushed research into other directions such as content based, demographic based, utility-based, knowledge-based and hybrids. This paper provides an introduction to collaborative filtering and content based methods, describing the underlying concepts, and discusses possible improvements using overclassification. Individual results are presented and then compared with the overclassification approach.

关键词： Collaboration Correlation Prediction algorithms Clustering algorithms Partitioning algorithms Training Motion pictures

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Time-triggered CANopen implementation for networked embedded systems

Time-triggered CANopen implementation for networked embedded...

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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

ISBN: (纸本)9781509027217

Networked embedded systems using event triggered communication are widely used in industry. While the bus load increases, the transmission of the lower priority messages may experience variable delays (jitter) or even may be unable to be transmitted. Even at maximum load, the transmission of such messages has to be guaranteed and the delivery time has to be determined with high precision. CANopen is an industrial event-driven network based on controller Area Network (CAN) protocol at the physical and data link communication levels. A time-triggered software extension of CANopen based on Time-Triggered CAN is described in this paper, as well as its implementation on an embedded networked system based on microcontrollers.

关键词： Protocols Synchronization Real-time systems Heart beat Embedded systems Jitter

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Symmetrical T-network with fractional order elements

Symmetrical T-network with fractional order elements

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International Conference on Environment and Electrical engineering (EEEIC)

作者： Maciej Włodarczyk Jarosław Szczepaniak Faculty of Electrical Engineering Automatic Control and Computer Science Kielce University of Technology Kielce Poland

The paper presents a symmetrical T-network utilizing fractional order elements. Fractional calculus was used for its modeling. A comparative analysis of a classic T-network and fractional order T-network step response... 详细信息

关键词： Transfer functions Fractional calculus Integrated circuit modeling Computational modeling RLC circuits Laplace equations

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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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An optimization method based on evolutionary computation used for estimating the energy consumption for heating in a building

UPB Scientific Bulletin, Series C: Electrical Engineering an...

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UPB Scientific Bulletin, Series C: Electrical engineering and computer Science 2016年第3期78卷 265-276页

作者： Cǎruţaşiu, Mihail-Bogdan Stegaru, Silvia Cristina Ionescu, Constantin Sluşanschi, Emil Ioan Badea, Adrian Ţǎpuş, Nicolae University Politehnica of Bucharest Faculty of Power Engineering Romania Faculty of Automatic Control and Computer Science University Politehnica of Bucharest Romania Faculty of Power Engineering University Politehnica of Bucharest Romania

Simplified mathematical models that can describe the real behavior of a building with relative small errors can provide useful information about the best operational methods of the HVAC (Heating, Ventilating and Air Conditioning) systems, energy demand for heating and cooling, etc. We developed a simplified mathematical model for computing the energy demand for heating and optimized it with a Genetic Algorithm, in order to minimize the error between the model and real data. The tested period (a month) showed that the optimization method is suitable for this type of applications and the relative error was 0.14 kWh.

关键词： Energy utilization

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Continuous defect prediction: The idea and a related dataset

arXiv

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arXiv 2017年

作者： Madeyski, Lech Kawalerowicz, Marcin Wroclaw University of Science and Technology Faculty of Computer Science and Management Wyb.Wyspianskiego 27 Wroclaw50-370 Poland Opole University of Technology Faculty of Electrical Engineering Automatic Control and Informatics ul. Sosnkowskiego 31 Opole45-272 Poland CODEFUSION Sp. z o.o. Armii Krajowej 16/2 Opole45-071 Poland

We would like to present the idea of our Continuous Defect Prediction (CDP) research and a related dataset that we created and share. Our dataset is currently a set of more than 11 million data rows, representing files involved in Continuous Integration (CI) builds, that synthesize the results of CI builds with data we mine from software repositories. Our dataset embraces 1265 software projects, 30,022 distinct commit authors and several software process metrics that in earlier research appeared to be useful in software defect prediction. In this particular dataset we use TravisTorrent as the source of CI data. TravisTorrent synthesizes commit level information from the Travis CI server and GitHub open-source projects repositories. We extend this data to a file change level and calculate the software process metrics that may be used, for example, as features to predict risky software changes that could break the build if committed to a repository with CI enabled. Copyright © 2017, The Authors. All rights reserved.

关键词： Forecasting

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Pupil detection algorithm based on RANSAC procedure

Pupil detection algorithm based on RANSAC procedure

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International Symposium on Signals, Circuits and Systems (ISSCS)

作者： Radu Gabriel Bozomitu Alexandru Păsărică Robert Gabriel Lupu Cristian Rotariu Eugen Coca Universitatea Tehnica Gheorghe Asachi din Iasi Iasi RO Faculty of Electronics Telecommunication and Information Technology “Gheorghe Asachi” Technical University Iaşi Romania Faculty of Computer Engineering and Automatic Control “Gheorghe Asachi” Technical University Iaşi Romania “Grigore T. Popa” University of Medicine and Pharmacy Iaşi Romania “Stefan cel Mare” University Suceava Romania

In this paper a new pupil detection algorithm based on RANSAC procedure is presented. Unlike other similar algorithms reported in the literature, the proposed algorithm provides higher accuracy, low running time and operates properly in noise conditions and for variable illumination. This algorithm is used in the field of assistive technology in order to communicate with neuromotor disabled people by detecting their gaze direction, and can easily be adapted for other applications, such as PC control using eye-gaze detection.

关键词： Fitting Handheld computers Data models Detection algorithms Real-time systems Cameras Feature extraction

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Optimal distributed control for platooning via sparse coprime factorizations

Optimal distributed control for platooning via sparse coprim...

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2016 American control Conference, ACC 2016

作者： SabǍu, Şerban OarǍ, Cristian Warnick, Sean Jadbabaie, Ali Electrical and Computer Engineering Dept. Stevens Institute of Technology HobokenNJ United States Automatic Control Dept. University Politehnica Bucharest Romania Information and Decision Algorithms Laboratories Faculty of the Computer Science Department Brigham Young University United States Electrical and Systems Engineering Dept. University of Pennsylvania United States

ISBN: (纸本)9781467386821

We introduce a novel distributed control architecture for disturbances attenuation in heterogeneous platoons of linear and time-invariant autonomous agents that inherits the performance achievable by the leader-follower control policies. We provide a Youla-like parameterization for the class of all distributed controllers such that the sparsity constraints are imposed on the controllers' left coprime factors, outlining a new concept of structural constraints in distributed control. The proposed scheme lends itself to optimal controller design via norm based costs, it guarantees string stability and completely eliminates the accordion effect from the behavior of the platoon. The distributed controller is proven to attain global optimality for heterogeneous platoons and H2 costs and can easily reconfigure such as to remain optimal during formation merging/exiting maneuvers. The scheme is amenable to a GPS time base synchronization mechanism, allowing for the exact compensation of the time delays induced by the wireless communications. © 2016 American automatic control Council (AACC).

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