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    Wyświetlanie 1-4 z 4
    Tytuł:
    Double Panel Structure for Active Control of Noise Transmission
    Autorzy:
    Morzyński, L.
    Szczepański, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/176968.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    noise
    sound insulating enclosure
    active structural acoustic control
    virtual microphone
    Opis:
    Passive noise reduction means are commonly used to reduce noise in the industry but, unfortunately, their effectiveness is poor in the low frequency range. By applying active structural acoustic control to the enclosure walls significant improvement of the insulating properties in this frequency range can be achieved. In this paper a model of double panel structure with ASAC is presented. The structure consists of two aluminium plates separated by an air gap. Two inertial magnetoelectric actuators and two piezoceramic MFC sensors were used for controlling the structure. A multichannel FxLMS algorithm with virtual error microphone technique is used as a control algorithm. The signal of a virtual error microphone is extrapolated basing on signals from MFC sensors. Performance of this actively controlled structure for tonal signals at selected frequencies is presented in the article. During the study, a double panel structure was mounted on one wall of sound insulating enclosure located in an acoustic chamber. During the measurements local and global reduction of noise test signal was investigated.
    Źródło:
    Archives of Acoustics; 2018, 43, 4; 689-696
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Active Noise Reduction Algorithm Based on NOTCH Filter and Genetic Algorithm
    Autorzy:
    Górski, P.
    Morzyński, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/177549.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    active noise reduction
    hearing protectors
    Opis:
    Application of active noise reduction (ANR) systems in hearing protectors requires the use of control algorithms to ensure stability of the ANR system and at the same time highly effective active noise reduction. A control algorithm based on NOTCH filters is an example of solutions that meet these criteria. Their disadvantage is operation over a narrow frequency band and a need for prior determination of frequencies to be reduced. This paper presents a solution of the ANR system for hearing protectors which is controlled with the use of modified NOTCH filters with parameters determined by a genetic algorithm. Application of a genetic algorithm allows to change the NOTCH filter reference signal frequency, and thus, adapt the filter to the reduced signal frequency.
    Źródło:
    Archives of Acoustics; 2013, 38, 2; 185-190
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application and Neural Networks in Active Noise Reduction Systems
    Autorzy:
    Morzyński, L.
    Makarewicz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/90886.pdf
    Data publikacji:
    2003
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    noise
    active methods
    control
    neural network
    hałas
    ochrona przed hałasem
    aktywna redukcja hałasu
    sieci neuronowe
    Opis:
    Active noise reduction systems based on a control unit in the form of a finite impulse response filter assume the linearity of every single component. Neural networks, which have so far been seldom used in this field, are a kind of a filter with the ability to project nonlinear characteristics of an active noise reduction system. This paper presents some simulation research studies of active noise reduction systems based on neural networks. Also presented are results of the operation of systems with different levels of complexity as well as the influence of different parameters of a neural network and of the system itself on those results.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2003, 9, 3; 257-270
    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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