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    Wyświetlanie 1-3 z 3
    Tytuł:
    Urban tidal flow noise - case study
    Autorzy:
    Bąkowski, Andrzej
    Radziszewski, Leszek
    Powiązania:
    https://bibliotekanauki.pl/articles/24201984.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    urban noise
    traffic flow
    monitoring station data
    hałas miejski
    ruch uliczny
    dane ze stacji monitoringu
    Opis:
    The study carried out an analysis of the urban traffic noise from 2011 to 2016 at Kielce (Poland). The results of noise simulations according to the Cnossos-EU model were compared with the sound level calculated by monitoring station and a very good agreement was obtained. The mean absolute error was smaller than 1 dB(A). For weekdays the charts shape at individual hours of the day were shown to be similar. However, one can notice a different shape of this charts from the morning peak on Friday to the end of the weekend and especially on Saturday and Sunday.
    Źródło:
    Vibrations in Physical Systems; 2023, 34, 1; art. no. 2023119
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Urban traffic noise of heavy vehicles in octave bands
    Autorzy:
    Bąkowski, Andrzej
    Dekýš, Vladimir
    Radziszewski, Leszek
    Świetlik, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/2146625.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    urban noise
    CNOSSOS-EU method
    heavy vehicles
    hałas miejski
    metoda CNOSSOS-EU
    pojazdy ciężarowe
    Opis:
    In this paper same results of heavy vehicles traffic measurements were used to simulate the noise measurands by the CNOSSOS-EU method for this purpose. The heavy vehicles traffic volume and velocity were recorded by permanent automatic monitoring station. The noise was calculated in octave bands according to the CNOSSOS-EU method. The positional and not positional measures of traffic noise were proposed for data scattering. The results was described using parameters such as the median, average peak noise, average maximum noise, average background level, first and third quartiles and relative measures of noise. Analyzes carried out for the tested section of the road showed that the traffic of heavy vehicles is not always the main source of road noise. It has been shown that maximum values of the acoustic pressure occur for the frequency of f0 = 500 Hz. The dispersion of noise and type A uncertainty of the results were evaluated.
    Źródło:
    Vibrations in Physical Systems; 2020, 31, 1; art. no. 2020103
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of spray distance on the microstructure and corrosion resistance of WC - based coatings sprayed by HVOF
    Autorzy:
    Jonda, Ewa
    Łatka, Leszek
    Maciej, Artur
    Godzierz, Marcin
    Gołombek, Klaudiusz
    Radziszewski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2204526.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WC-based powders
    AZ31 magnesium alloy
    high velocity oxy fuel
    HVOF
    microstructure
    corrosion resistance
    stop magnezu AZ31
    mikrostruktura
    odporność na korozję
    natryskiwanie naddźwiękowe cieplne
    proszek na bazie węglika wolframu
    Opis:
    Cermet coatings provide protection against aggressive operating environment of machine and device elements, such as corrosion, wear or high-temperature conditions. Currently WC-based cermet coatings are frequently used in the different industry branches. In this work, conventional WC-based powders (WC-Co and WC-Co-Cr) were sprayed with High Velocity Oxy Fuel (HVOF) onto AZ31 magnesium alloy with different spray distances (320 and 400 mm). The aim of the research was to investigate the effect of the spray distance on the microstructure of the coatings, phase composition and electrochemical corrosion resistance. Results revealed that higher spray distance results in greater porosity, 1.9% and 2.3% for 320 mm and 2.8% and 3.1% for 400 mm in case of WC-Co and WC-Co-Cr coatings, respectively. Also the influence has been observed for coatings microhardness, c.a. 1300 HV0.3 for shorter spray distance, whereas for longer one it was less than 1100 HV0.3. The corrosion resistance estimated in potentiodynamic polarization measurements was the best for WC-Co-Cr coating deposited from the shorter spray distance, corrosion current density was equal to 2.9 µA·cm-2 and polarization resistance was equal to 8424 Ω∙cm2.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 2; art. no. e144610
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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