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    Tytuł:
    Ewaluacja częstotliwościowa, jako proces doskonalenia procesu produkcyjnego - analiza problemu na obiekcie przemysłowym
    Evaluation of the frequency, as a process improvement production process - analysis of the problem site for industry
    Autorzy:
    Flasza, J.
    Głodkowski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1369572.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    ewaluacja częstotliwości
    evaluation of frequency
    Opis:
    Article raises the question of absolute shaft vibration monitoring, while stressing that effective monitoring of the dynamic shaft, it is possible by supplementing the monitoring system in noncontact shaft absolute vibration sensors. The analysis is based on a real industrial system WGGC - the main gas circulating fan in a Coke Friendship Llc to obtain indicators of improving the production process.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2012, 2, 95; 125-127
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of features for the automatic recognition of OFDM signals in monitoring or cognitive receivers
    Autorzy:
    Liedtke, F.
    Albers, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/308231.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    OFDM signal recognition
    discrimination features
    cepstrum evaluation
    estimation of frequency channel number
    Opis:
    The automatic recognition of signal types is an important task of monitoring receivers and also cognitive receivers. Several modulation recognition or classification procedures exist for single channel signal types while a simple robust procedure for automatic recognition of OFDM signals is lacking because of its numerous frequency channelslying close together. The task considered in this paper is the discrimination between OFDM (or multi-channel) signals and other signal types. The number of frequency channels of the OFDM signals is assumed to be unknown a priori. So, together with the automatic OFDM detection the estimation of the number of frequency channels is treated. Several discrimination features have been examined and the most promising ones are described: measures of the variation, of the skewness, of the kurtosis, and of the specific picket-fence shape of the spectrum which is typical for many OFDM signals. For a number of real-world OFDM samples, recorded from the high frequency range, results are presented. An automatic discrimination from single channel or noise like signals is achieved and the number of system channels can be estimated.
    Źródło:
    Journal of Telecommunications and Information Technology; 2008, 2; 30-36
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The evaluation of the current state of EHF-sensors quality in the technical systems and its improvement
    Autorzy:
    Chovnyuk, Y. V.
    Ivanov, E. A.
    Dovhaljuk, V. B.
    Shyshyna, M. A.
    Gumenjuk, Y. O.
    Sivak, I. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/114875.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    aperture
    coaxial line
    dynamic range of the evaluation
    extremely high frequency sensors
    function of the entropy evaluation
    scale of the entropy evaluation
    oceny entropii
    czujnik
    funkcja oceny entropii
    Opis:
    In the article the function and the scale for the entropy evaluation of the current state of extremely high frequency (EHF-) sensors quality in the various technical systems which fits the requirements of universality and maximal independency from the human factor are offered. One may see such EHF-sensors for the analysis of the quick transformations of the biological liquids properties. It’s high lighted that the available methods of the determination of technical systems’ quality have essential flaws which consist in both subjectivism because the dominant role in the evaluation belongs to experts and legitimacy of providing them properties of universality which was proved by nobody. The scheme of EHF-sensor is analyzed for which one may create an analytical model. The problem of the fields’ determination at the working region of such sensor is discussed. The presented scheme is possible to use for the mathematical model and just for that part of the problem which is devoted to the transformation of the properties of the object. The results of calculation of components of electromagnetic field at the working space of EHF-sensor are discussed. One may estimate the sizes of this space. The offered function of the quality evaluation, the parameter of which is the quantity of own information of the explored sensor, provides the declared universality approach according to the principles of the information theory. The conformity to all requirements for the functions of the evaluation of the quality: continuity, monotonic and smoothness over the whole range of definition regardless of the probability distribution function, which is measured by the random value EHF-sensor was proved. The proposed scale of the entropy evaluation of the quality fits to standard settings of the diagnostic of the technical systems and has three sub ranges which determine the state of the EHF-sensors: good state, up state, and down state. Unlike the existing psychophysical scales the offered scale has dynamic range of the evaluation so the limits of the sub ranges will automatically change depending on the regulatory and technical requirements for the state of the explored EHF-sensor. Such approach provides adaptation of the scale to specific requirements which gives a chance to evaluate the qualitative state of the object more reliably. The results of modeling of the qualitative state of the sensor are given. The possible practical application of the offered function and scale is usage in the systems of monitoring and diagnostic for determination of the current qualitative state of the explored technical system, as well.
    Źródło:
    Zeszyty Naukowe. Quality. Production. Improvement; 2019, 2 (11); 26-40
    2544-2813
    Pojawia się w:
    Zeszyty Naukowe. Quality. Production. Improvement
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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