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Wyszukujesz frazę "low frequency" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    A Study of Annoyance Caused by Low-Frequency Noise During Mental Work
    Autorzy:
    Kaczmarska, A.
    Łuczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/89879.pdf
    Data publikacji:
    2007
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    low-frequency noise
    annoyance
    working environments
    Opis:
    This article presents the results of an analysis of annoyance caused by low-frequency noise (including infrasonic noise) that occurs at work stations located in offices. The tests covered measurements of acoustic parameters specific for this type of noise and a survey conducted in the working environment and in laboratory conditions at a model of a work station.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2007, 13, 2; 117-125
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Sound Radiation From a Circular Hatchway
    Autorzy:
    Arenas, J. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/89797.pdf
    Data publikacji:
    2009
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    low-frequency noise
    sound radiation
    circular plate
    hatchway
    Opis:
    Low-frequency sound radiation from vibrating plates is a practical problem often found in engineering applications. In this article, the sound radiation from a circular hatchway is examined using a discrete approach based in the acoustic resistance matrix. Since this matrix can be combined with the volume velocity vector on the discretized vibrating circular surface, the sound radiation efficiency can be estimated through matrix approaches. The limitation of the approach is discussed by using benchmark results presented in previous works. The method produces acceptable results in low frequencies when the response of the plate is dominated by one low structural mode. When the response of more than one mode is significant, the method gives good estimation of the total sound power just for frequencies up to the first resonance. However, the method can be applied to complex and irregular vibrating plane surfaces.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2009, 15, 4; 401-407
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Modal Low Frequency Noise of an Elastically Supported Circular Plate
    Autorzy:
    Rdzanek, W. P.
    Rdzanek, W. J.
    Engel, Z.
    Szemela, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/89877.pdf
    Data publikacji:
    2007
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    low frequency noise
    radiation efficiency
    circular plate
    hatchway
    Opis:
    The modal low frequency noise generated by a vibrating elastically supported circular plate embedded into a flat infinite baffle has been examined. The main aim of this study is the analysis of the radiation efficiency. Low frequency approximated formulas have been presented. They are valid for all the limiting boundary conditions of the plate with its edge clamped, guided, simply supported or free as well as for all the intermediate axisymmetric boundary configurations. The formulas are expressed in the elementary form, useful for numerical computations. They are a generalization of some earlier published results. First, they are valid for axisymmetric and asymmetric modes since both kinds of modes play an important role in the low frequency range. Second, a single formula for the radiation efficiency, valid for all the axisymmetric boundary configurations, has been proposed. A numerical example for the sound power radiation has been given for some hatchway covers mounted on a ship deck.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2007, 13, 2; 147-157
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Adaptive System for Active Noise Reduction
    Autorzy:
    Makarewicz, G.
    Matuszewski, G.
    Morzyński, L.
    Zawieska, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/90095.pdf
    Data publikacji:
    2000
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    noise reduction
    active cancellation
    adaptive system
    low frequency noise
    warunki pracy
    system adaptacyjny
    redukcja szumu
    Opis:
    An adaptive system for active noise reduction in an acoustic duct is presented. The system is based on a modification of a least mean square (LMS) algorithm called filtered-U with on-line error path modelling. The system was assembled and examined on a laboratory test stand in the Laboratory of Active Noise Reduction Methods of the Central Institute for Labour Protection (Warsaw, Poland). The structure of the stand, the block structure of the active noise reduction system, the basic assumption concerning the applied adaptive algorithm, and examples of measured effectiveness of the system for various kinds of noise are presented.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2000, Zeszyt Specjalny; 13-22
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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