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    Wyświetlanie 1-10 z 10
    Tytuł:
    Variability of the Acoustic Emission Signals Generated by Partial Discharges in Mineral Oil
    Autorzy:
    Kunicki, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/177772.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    acoustic emission
    partial discharge
    insulation system
    measurements
    signal processing
    Opis:
    The main purpose of the presented research is to investigate the partial discharge (PD) phenomenon variability under long-term AC voltage with particular consideration of the selected physical quantities changes while measured and registered by the acoustic emission method (AE). During the research a PD model source generating surface discharges is immersed in the brand new insulation mineral oil. Acoustic signals generated by the continuously occurred PDs within 168 hours are registered. Several qualitative and quantitative indicators are assigned to describe the PD variability in time. Furthermore, some longterm characteristics of the applied PD model source in mineral oil, are also presented according to acoustic signals emitted by the PD. Finally, various statistical tools are applied for the results analysis and presentation. Despite there are numerous contemporary research papers dealing with long-term PD analysis, such complementary and multiparametric approach has not been presented so far, regarding the presented research. According to the presented research from among all assigned indicators there are discriminated descriptors that could depend on PD long-term duration. On the grounds of the regression models analysis there are discovered trends that potentially allow to apply the results for modeling of the PD variability in time using the acoustic emission method. Subsequently such an approach may potentially support the development and extend the abilities of the diagnostic tools and maintenance policy in electrical power industry.
    Źródło:
    Archives of Acoustics; 2019, 44, 2; 339-348
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of A/D quantization in an interpolated DFT based system of power control with a small delay
    Autorzy:
    Borkowski, J.
    Kania, D.
    Mroczka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221386.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photovoltaic system
    frequency estimation
    signal processing
    A/D converter
    control of power system
    Opis:
    Fast and accurate grid signal frequency estimation is a very important issue in the control of renewable energy systems. Important factors that influence the estimation accuracy include the A/D converter parameters in the inverter control system. This paper presents the influence of the number of A/D converter bits b, the phase shift of the grid signal relative to the time window, the width of the time window relative to the grid signal period (expressed as a cycle in range (CiR) parameter) and the number of N samples obtained in this window with the A/D converter on the developed estimation method results. An increase in the number b by 8 decreases the estimation error by approximately 256 times. The largest estimation error occurs when the signal module maximum is in the time window center (for small values of CiR) or when the signal value is zero in the time window center (for large values of CiR). In practical applications, the dominant component of the frequency estimation error is the error caused by the quantization noise, and its range is from approximately 8×10-10 to 6×10-4.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 3; 423-432
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On-line process identification using the Modulating Functions Method and non-asymptotic state estimation
    Autorzy:
    Byrski, Witold
    Drapała, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/2175109.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    system identification
    modulating functions method
    state observers
    signal processing
    adaptive algorithms
    Opis:
    The paper presents an iterative identification method dedicated for industrial processes. The method consists of two steps. In the first step, a MISO system is identified with the Modulating Functions Method to obtain sub-models with a common denominator. In the second step, the obtained subsystems are re-identified. This procedure enables to obtain the set of models with different denominators of the transfer functions. The algorithm was used for on-line identification of a glass conditioning process. Identification window is divided into intervals, in which the models can be updated based on recent process data, with the use of the integral state observer. Results of the performed simulations for the identified models are compared with the historical process data.
    Źródło:
    Archives of Control Sciences; 2022, 32, 3; 535--555
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    LMS Algorithm Step Size Adjustment for Fast Convergence
    Autorzy:
    Bismor, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/177252.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    signal processing
    adaptive algorithms
    least mean squares
    active noise control
    system identification
    Opis:
    In the areas of acoustic research or applications that deal with not-precisely-known or variable condi- tions, a method of adaptation to the uncertainness or changes is usually necessary. When searching for an adaptation algorithm, it is hard to overlook the least mean squares (LMS) algorithm. Its simplicity, speed of computation, and robustness has won it a wide area of applications: from telecommunication, through acoustics and vibration, to seismology. The algorithm, however, still lacks a full theoretical analysis. This is probabely the cause of its main drawback: the need of a careful choice of the step size – which is the reason why so many variable step size flavors of the LMS algorithm has been developed. This paper contributes to both the above mentioned characteristics of the LMS algorithm. First, it shows a derivation of a new necessary condition for the LMS algorithm convergence. The condition, although weak, proved useful in developing a new variable step size LMS algorithm which appeared to be quite different from the algorithms known from the literature. Moreover, the algorithm proved to be effective in both simulations and laboratory experiments, covering two possible applications: adaptive line enhancement and active noise control.
    Źródło:
    Archives of Acoustics; 2012, 37, 1; 31-40
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selekcja cech osobniczych sygnału mowy z wykorzystaniem algorytmów genetycznych
    Autorzy:
    Kamiński, Kamil
    Dobrowolski, Andrzej P.
    Majda, Ewelina
    Powiązania:
    https://bibliotekanauki.pl/articles/111176.pdf
    Data publikacji:
    2019
    Wydawca:
    Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
    Tematy:
    mowa
    głos
    system automatycznego rozpoznawania mowy
    przetwarzanie sygnałów
    speech
    voice
    speech recognition system
    signal processing
    Opis:
    W referacie przedstawiono system automatycznego rozpoznawania mówcy zaimplementowany w środowisku Matlab oraz pokazano sposoby realizacji i optymalizacji poszczególnych elementów tego systemu. Główny nacisk położono na wyselekcjonowanie cech dystynktywnych głosu mówcy z wykorzystaniem algorytmu genetycznego, który pozwala na uwzględnienie synergii cech podczas selekcji. Pokazano również wyniki optymalizacji wybranych elementów klasyfikatora, m.in. liczby rozkładów Gaussa użytych do zamodelowania każdego z głosów. Ponadto, podczas tworzenia modeli głosów zastosowano model głosu uniwersalnego.
    The paper presents automatic speaker recognition system, implemented in the Matlab environment, and demonstrates how to achieve and optimize various elements of the system. The main emphasis was put on features selection of speech signal using a genetic algorithm, which takes into account synergy of features. The results of the selected elements of optimizing classifier have been also shown, including the number of Gaussian distributions used to model each of the voices. In addition during creating voice models, the universal voice model have been used.
    Źródło:
    Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2019, 1-2; 8-16
    2450-1859
    2450-8721
    Pojawia się w:
    Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vibroacoustic condition monitoring of the complex rotation system based on multilevel signal processing
    Autorzy:
    Pazdrii, Olha
    Bouraou, Nadiia
    Powiązania:
    https://bibliotekanauki.pl/articles/2146575.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    rotation system
    signal processing
    bispectrum analysis
    fractal box-counting dimension
    system rotacyjny
    przetwarzanie sygnałów
    analiza bispektralna
    fraktalny wymiar pudełkowy
    Opis:
    This work is devoted to further research and improvement of the vibroacoustic condition monitoring of complex rotation system during operation. The low-frequency vibration and acoustic noise in the range 0-10 kHz is used as diagnostic information. We propose to use Bispectrum (BS) Analysis at the first level of signal processing, and Fractal Analysis of BS contour images at the second level of signal processing for the diagnosis of small imbalance of rotation system. The experimental studies of forced vibrations of the physical model (PM) of the rotation system are carried out under steady-state and non-steady-state rotation excitations. The results of the BS Analysis of vibroacoustical signals, which are emitted by a rotating PM during different excitation modes, are processed in order to determine fractal box-counting dimension (Minkowski dimension). The research shows that a small imbalance can be efficiently detected by the proposed multilevel signal processing in all modes of PM operation.
    Źródło:
    Vibrations in Physical Systems; 2020, 31, 2; art. no. 2020224
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza wydajności obliczeniowej systemu pomiarowego jakości energii elektrycznej opartego na urządzeniu embedded BeagleBoard z systemem operacyjnym Linux
    An efficiency analysis of the power quality monitoring system based on BeagleBoard embedded with Linux operating system
    Autorzy:
    Zygarlicki, J.
    Mroczka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/274929.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    analiza sygnałów
    jakość energii elektrycznej
    metoda Prony’ego
    urządzenie wbudowane
    przetwarzanie sygnałów
    signal analysis
    power quality
    Prony's method
    embedded system
    signal processing
    Opis:
    W artykule przedstawiono możliwości zastosowania niskobudżetowego modułu embedded BeagleBoard na bazie procesora OMAP firmy Texas Instruments, działającego pod kontrolą systemu Linux, do budowy zaawansowanego urządzenia pomiarowego parametrów jakości energii elektrycznej. W artykule przeanalizowano czasy obliczeń złożonych algorytmów przetwarzania sygnałów na przykładzie metody Prony'ego, mogących mieć zastosowanie przy wyznaczaniu parametrów jakości energii elektrycznej. Czasy te będą porównane z czasami obliczeń dla typowych urządzeń klasy PC o architekturze 8086. Dodatkowo zostaną pokazane możliwości dołączenia do systemu urządzeń peryferyjnych oraz sond pomiarowych.
    The article show the possibilities of use of the low cost BeagleBoard embedded system based on Texas Instruments OMAP processor with Linux operating system used for advanced power quality monitoring system. The authors show analysis results of the required time computation for presented advanced signal analysis methods like Prony's method, which can be used for power quality parameters estimation. The results were compared with computations made for PC standard computers, with x86 architecture. Additional, the article show possibility of peripheral devices connections to the presented system.
    Źródło:
    Pomiary Automatyka Robotyka; 2010, 14, 12; 50-52
    1427-9126
    Pojawia się w:
    Pomiary Automatyka Robotyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagnosis support method of pletysmographical records with the use of framework tenets
    Autorzy:
    Penhaker, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/333197.pdf
    Data publikacji:
    2003
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    przetwarzanie sygnałów
    pletyzmografia
    transformata falkowa
    system ekspercki
    rozszerzenie jądra
    signal processing
    plethysmography
    wavelet transform
    expert systems
    framework
    kernel extension
    Opis:
    The aim of this study is the processing and evaluating of plethysmographical records giving important information about the blood vessel function. Result of this study is to present the methodology for classifying the records by means of mathematical methods that would contribute to systematic evaluation of what has been found by finger plethysmography. Thereafter the experimental expert system based on framework systems serves to determine the diagnosis on the basis of previous mathematical processing is introduced. The goal of the project was also creation of application by the form of the extension of kernel for the use of framework that is determined for support of control and information systems development in the area of signal processing, elaborate and describe the methodology of extension hereof setting in the nature of specific applications. Beyond above-mentioned outputs the solution of the project should give the specific knowledge about the usage effectiveness of evolutional frameworks. Fundamental implementation idea is based on the usage of MATLAB as the basis for extension of common kernel.
    Źródło:
    Journal of Medical Informatics & Technologies; 2003, 5; MI121-127
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Mechanism of Signal Processing of Solar Radio Burst Data in E-CALLISTO Network (Malaysia)
    Autorzy:
    Hamidi, Z. S.
    Shariff, N. N. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412533.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Space weather
    CALLSITO system
    ISWI (International Space Weather Initiative)
    sun
    solar radio burst
    solar activity
    signal processing
    e-network
    Opis:
    Solar space weather events like Coronal Mass Ejections and solar flares are usually accompanied by solar radio bursts, which can be used for a low-cost real-time space weather monitoring. In order to make a standard system, a CALLISTO (Compound Astronomical Low-cost Low-frequency Instrument for Spectroscopy in Transportable Observatory) spectrometers, designed and built by electronics engineer Christian Monstein of the Institute for Astronomy of the Swiss Federal Institute of Technology Zurich (ETH Zurich) have been already developed all over the world since 2005 to monitor the solar activities such as solar flare and Coronal Mass Ejections (CMEs). Up to date, there are 25 sites that used the same system in order to monitor the Sun within 24 hours. This outstanding project also is a part of the United Nations together with NASA initiated the International Heliophysical Year IHY2007 to support developing countries participating in ‘Western Science’. Beginning February 2012, Malaysia has also participated in this project. The goals of this work is to highlight how does the signal processing of solar radio burst data transfer from a site of National Space Centre Banting Selangor directly to the Institute of Astrophysics Switzerland. Solar activities in the low region, focusing from 150 MHz to 400 MHz is observed daily beginning from 00.30UT 12.30 UT. Here, we highlighted how does the signal processing work in order to make sure that the operation is in the best condition. Although the solar activities have experienced rapid growth recently, high-level management of CALLISTO system has remained successfully manage the storage of data. It is also not easy to maintain the future data seems the number of sites are also growing from time to time. In this work, we highlighted the potential role of Malaysia as one of the candidate site that possible gives a good data and focusing on a few aspects such as optimization, and performance evaluation data and visualization.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 15; 30-38
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CRM-203 Type Frequency Modulated Continuous Wave (FM CW) Radar
    Autorzy:
    Plata, M.
    Wawruch, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/117181.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    radar
    Frequency Modulated Continuous Wave (FMCW)
    FMCW Radar
    Mean Time Between Failure (MTBF)
    signal processing
    fast Fourier transformation (FFT)
    Constant False Alarm Ratio (CFAR)
    Automatic Identification System (AIS)
    Opis:
    Paper presents description of the principle of work, structure and basic technical parameters of the Maritime Coastal Surveillance Frequency Modulated Continuous Wave (FMCW) Radar CRM-203 type constructed by Telecommunication Research Institute Ltd. in Gda?sk. Results of its tests in real conditions and comparison with pulse ship radars with scanners installed in the same place will be presented during the conference.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2009, 3, 3; 311-314
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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