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    Wyświetlanie 1-4 z 4
    Tytuł:
    Impact of cavity edges shape on aerodynamic noise
    Autorzy:
    Łojek, Paweł
    Czajka, Ireneusz
    Powiązania:
    https://bibliotekanauki.pl/articles/24202002.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    aeroacoustics
    fluid-acoustic coupling
    cavity noise
    aeroakustyka
    hałas generowany przez komorę
    Opis:
    In this article, the analysis of influence of cavity edge shapes on flow-generated noise is performed. The acoustic wave propagation in the channel, that result from the flow, was analyzed. Shape of upstream and downstream edges was modified. The hybrid method based on Navier-Stokes and Perturbed Convective Wave Equation was used to solve the unidirectional coupling. The research showed a significant influence of the modification of the shape of the cavity edges on the generated noise. The change of downstream corner allowed for significant reduction of noise in the entire analysed band and allowed for the reduction of overall sound pressure level (OASPL) by 5 dB. Modifications of the upstream edge did not bring such differences, change in OASPL was up to 1 dB. The obtained spectra of the sound pressure level showed compliance with the calculated natural frequencies of the analysed object, as well as with some of the Rossiter modal frequencies, typical for the phenomena occurring in the cavities.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 3; art. no. 2022301
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the elastic cavity walls on cavity flow noise
    Autorzy:
    Łojek, Paweł
    Czajka, Ireneusz
    Gołaś, Andrzej
    Suder-Dębska, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2146644.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    FSI
    Detached Eddy Simulations
    acoustic analogy
    cavity noise
    analogia akustyczna
    hałas generowany przez komorę
    Opis:
    In this study, computational fluid dynamics and computational aeroacoustics methods were used to investigate the influence of the elastic cavity walls on the noise generated by the flow over rectangular cavity. Two cases were considered and compared, one with rigid cavity walls, and one with elastic walls. In the latter case, the movement of the walls were solved by finite element modelling and coupled with CFD simulations. The noise generated by the flow over cavity was computed using Ffowcs Williams & Hawkings acoustic analogy. The increase of the sound pressure level for elastic walls case at frequency range of 1 kHz to 10 kHz is observed, compared to the rigid walls case.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 1; art. no. 2021109
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of the acoustic wave scattering on the aircraft surface using the boundary element method
    Autorzy:
    Nowicki, Dawid
    Suder-Dębska, Katarzyna
    Czajka, Ireneusz
    Powiązania:
    https://bibliotekanauki.pl/articles/24201977.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    sound localization
    boundary element method
    sound scattering
    noise
    aircraft
    Smart Acoustics
    lokalizacja dźwięku
    metoda elementów brzegowych
    rozproszenie dźwięku
    hałas
    samolot
    Opis:
    Sound localization tools are important in the environmental protection and the human searches. The article is one of the stages of the implementation of the concept of using aircraft to localize sound sources. The use of a fixed-wing aircraft instead of a multirotor would increase the total flight time, and expand the surveyed area. It is important to determine the most favourable positions of the receivers on the surface of the aircraft. The scattering effects of the sound waves coming from the ground source and aircraft engine on the acoustic field on the aircraft surface are not homogeneous. In the article the authors present the modelling of the scattering of the sound waves over the airplane surface with the usage of boundary element methods. After determining the effects from the sound source on earth and from the aircraft engine the conclusion was made, that the influence from the engine noise is greater than that from the ground source, and in order to localize the low amplitude signals, the aircraft need to glide. Considering only the effects of the ground source, the optimal areas for the microphones placement were determined.
    Źródło:
    Vibrations in Physical Systems; 2023, 34, 1; art. no. 2023107
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determinig of the sound power of the fan in in situ conditions using the virtual reference source method
    Autorzy:
    Suder-Dębska, Katarzyna
    Czajka, Ireneusz
    Łojek, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/2146654.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    fan as a sound source
    sound power
    noise
    reference source
    regularization
    wentylator jako źródło dźwięku
    moc akustyczna
    hałas
    źródło odniesienia
    regularyzacja
    Opis:
    Sound power is one of the basic parameters characterizing the sound source and has a direct impact on the acoustic climate in its surroundings. Therefore, the determining of the sound power of machines is a practical problem. While there are many methods of determining the sound power, each of them has its own limitations. The authors presented the implementation of a comparative method of determining the sound power with the use of a virtual reference source. The method was used to test a high-efficiency flue gas exhaust fan installed on a laboratory stand. The sound source was placed in the geometric centre of the fan and the acoustic field distribution in the room was determined using geometrical methods. After determining the influence factors, the value of the source sound power of the source was calculated by means of the Moore-Penrose pseudo-inverse. Since the problem under study belongs to the inverse problems, the Tikhonov regularization was used, where the value of the parameter α was determined by the L-curve method.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021206
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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