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Analysis of low-frequency acoustic signals emitted by low-power vertical axis wind turbine VAWT

Analysis of low-frequency acoustic signals emitted by low-po...

引用

International Conference on Environment and Electrical engineering

作者： Radoslaw Pierzga Tomasz Boczar Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

ISBN: (纸本)9781467330602

Operating wind turbines produce infrasound noise thus they act on the environment. This also applies to small wind turbines, which are located in the immediate vicinity of human settlements. Small wind turbines can be located close to buildings and mounted directly on their walls and roofs. In this case, it is important to determine the level of environmental impact of such type of installation. Measurement results of infrasound noise generated by a small vertical axis wind turbine (VAWT), rated power 1 kW, are presented in the paper. Analysis results of sound pressure level and dependence of signal spectra from different wind speeds are shown. In the analysis of sound pressure level the G weighing curve was used according to the ISO 7196:2002 standard and achieved results were referred to the limits contained in the current legislation, what allowed for evaluation of the infrasound noise impact of the turbine under study.

关键词： Infrasound emission Small wind turbine VAWT

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Analysis of infrasound noise emitted by high power wind turbine with asynchronous generator for selected resonant and median frequencies

Analysis of infrasound noise emitted by high power wind turb...

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International Conference on Environment and Electrical engineering

作者： Tomasz Malec Tomasz Boczar Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

ISBN: (纸本)9781467330602

The paper presents analysis results of sound pressure level of infrasound noise generated by brand new wind turbine from REPOWER type MM92, rated power 2 MW. As results the amplitude spectra of noise for three chosen wind speed values are presented. Additionally, distributions of the sound pressure level with dependence on wind speed for selected resonant and median frequency values are presented. For chosen frequencies linear regression analysis was performed and subjected for a detailed evaluation. Values obtained from measurement were referred to and compared with the limits specified in legislations existing in this area.

关键词： Component Wind turbine Infrasound noise Synchronous generator

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Analysis of infrasound noise emitted by high-power wind turbine with synchronous generator

Analysis of infrasound noise emitted by high-power wind turb...

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International Conference on Environment and Electrical engineering

作者： Tomasz Malec Tomasz Boczar Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

ISBN: (纸本)9781467330602

Analysis results of sound pressure level of infrasound noise generated by high-power wind turbine Vensys type 62, which is operated for five years with an electrical capacity of 1.2 MW, are presented in the paper. Frequency and time-frequency spectrograms calculated for recorded low-frequency signals with respect to all registered changes of electrical power generated and the number of rotor revolutions per minute are presented. All measured sound pressure levels have been evaluated with and without the use of G weighting curve, which have helped to determine the size of infrasound impact of turbines and to analyze the influence of regarded parameters on this impact range of changes. Values obtained from measurement were referred to and compared with the limits specified in legislations existing in this area.

关键词： Component: wind turbine Infrasound noise Synchronous generator

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Efficient fractal method for texture classification

Efficient fractal method for texture classification

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2013 2nd International Conference on Systems and computer Science, ICSCS 2013

作者： Popescu, Andreea Lavinia Popescu, Dan Ionescu, Radu Tudor Angelescu, Nicoleta Cojocaru, Romeo Faculty of Automatic Control and Computer Science Politehnica University of Bucharest 313 Splaiul Independentei Street Bucharest Romania Faculty of Mathematics and Computer Science University of Bucharest 14 Academiei Street Bucharest Romania Faculty of Electrical Engineering Valahia University of Targoviste 2 Carol I Blvd Targoviste Romania

ISBN: (纸本)9781479920204

This paper presents an alternative approach to classical box counting algorithm for fractal dimension estimation. Irrelevant data are eliminated from input sequences of the algorithm and a new fractal dimension, called efficient fractal dimension (EFD), which is based on the remaining sequences is calculated. The discriminating capacity and the time efficiency of EFD are evaluated in comparison with fractal dimension (FD) computed by box counting both theoretically and empirically. The results revealed that EFD is better than FD for texture identification and classification. © 2013 IEEE.

关键词： Fractal dimension

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Structured coprime factorizations description of linear and time-invariant networks

Structured coprime factorizations description of linear and ...

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52nd IEEE Conference on Decision and control, CDC 2013

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

ISBN: (纸本)9781467357173

In this paper we study state-space realizations of Linear and Time-Invariant (LTI) systems. Motivated by biochemical reaction networks, Gonçalves and Warnick have recently introduced the notion of a Dynamical Structure Functions (DSF), a particular factorization of the system's transfer function matrix that elucidates the interconnection structure in dependencies between manifest variables. We build onto this work by showing an intrinsic connection between a DSF and certain sparse left coprime factorizations. By establishing this link, we provide an interesting systems theoretic interpretation of sparsity patterns of coprime factors. In particular we show how the sparsity of these coprime factors allows for a given LTI system to be implemented as a network of LTI sub-systems. We examine possible applications in distributed control such as the design of a LTI controller that can be implemented over a network with a pre-specified topology. ©2013 IEEE.

关键词： Factorization

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Image vectorization on modern architectures

Image vectorization on modern architectures

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IEEE International Conference on Intelligent computer Communication and Processing

作者： Emil Slusanschi Grigore Lupescu Computer Science and Engineering Departament Faculty of Automatic Control and Computers University "Politehnica" of Bucharest

ISBN: (纸本)9781479914920

This work presents an image vectorization application aimed to exploit features found in most of today's modern architectures. Design decisions supported by performance results are presented along with use cases for the proposed solution. We will present the algorithm, the target architectures and threading models, as well as a number of optimization techniques. Finally results of both low power SoC and high performance multicore processors are discussed.

关键词： Vectorization Heterogeneous Manycore Imaging Parallelism Multicore

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Hand pose estimation using HOG features from RGB-D data

Hand pose estimation using HOG features from RGB-D data

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

作者： Constantina Raluca Mihalache Bogdan Apostol Faculty of Automatic Control and Computer Engineering Technical University “Gheorghe Asachi” Iasi Romania

Visual based recognition of hand gestures has been an active research field in recent years due to its efficiency in helping us achieve a more natural human-computer interaction. This paper presents a new approach to hand pose estimation using combined visual and geometric information obtained in a synchronized format from a RGB-D sensor. Firstly, we track the contour of the hand and recognize the fingertip positions. Then, Kernel Principal Component Analysis is used for selecting the most relevant elements from the histograms of oriented gradients feature vectors obtained on both color and depth data. We define an observation model based on the found fingertip positions and the selected principal components and we feed it as input for a Support Vector Machine classifier. Experimental results for the proposed method show that good detection percentages can be obtained with a small training dataset of real hand images and depth masks.

关键词： Feature extraction Support vector machines Training Kernel Image segmentation Vectors Principal component analysis

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CAN - Ethernet gateway for automotive applications

CAN - Ethernet gateway for automotive applications

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

作者： Mihai Postolache Gabriel Neamtu Sorin Dumitru Trofin “Gheorghe Asachi” Technical University of Iasi Faculty of Automatic Control and Computer Engineering Iasi Romania

This paper presents the design and practical implementation of a gateway interface between two networks, CAN and Ethernet. Data packets detected over a network will be routed to the other network, with the possibility of using various filters. Since there is no standard yet for this purpose, the paper also proposes a method to pack one or more CAN messages in an Ethernet frame. For testing purposes of the interface gateway and its implementation a series of graphical software tools running on a PC client have been developed. These tools are able to send and decode messages using the specified packaging. At the end of the paper a graphical application demonstrates the functionality of the gateway implementation and the benefits of the proposed CAN-Ethernet routing method.

关键词： Logic gates Protocols IP networks Ports (computers) Hardware Standards Operating systems

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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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Shortening of the Automata Cycle of Industrial Communication System Nodes

Shortening of the Automata Cycle of Industrial Communication...

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2013 2nd International Conference on Advances in computer Science and engineering(CSE 2013)

作者： Marcin Sidzina Andrzej Kwiecień Jacek Stój Faculty of Mechanical Engineering and Computer Science University of Bielsko-Bia?a Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology

The distributed computer systems applied in industry are usually of the real-time type. In those systems the maximal system response time has to be always well known in order to ensure the functional as well as the safety parameters of the system. However, the system response time may be subject to change as a result of system development during its life cycle. As the given system grows, the response time lengthens. So it happens that in order to satisfy the real-time constraints, the response time T RES has to be reduced after the system development. One of the factors that have an influence on the T RES time, is the automata cycle of the communication system nodes. The shorter the automata cycle is, the more frequent is the data exchange between the CPU module and the communication module of the given system node, which improves the T RES value. However, having the node's application well implemented, shortening of the automata cycle may seldom be done by the application optimization. Then, the only solution would be to temporary shorten the automata cycle by execution of some of the most crucial parts of the user application. In this paper, a method for shortening the automata cycle is described.

关键词： automata cycle events avalanche events burst communication network distributed real-time system programmable logic controller PLC real-time temporal determinism

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