Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "noise level" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-4 z 4
    Tytuł:
    Required attenuation of aircraft noise in buildings in the light of data from the Chopin Airport monitoring
    Autorzy:
    Rudno-Rudziński, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/128150.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    building acoustics
    aircraft noise
    permissible noise level in buildings
    akustyka budynku
    hałas lotniczy
    dopuszczalny poziom hałasu w budynkach
    Opis:
    The minimum attenuations of aircraft noise required by the Polish Standards concerning acoustic insulation and noise levels inside buildings have been compared. Data from the noise monitoring system of the Chopin Airport were used. The minimum attenuation required by PN-B-02151-02:1987 differs from that required by PN-B-02151-3:2015-10. The highest required attenuation occurs when taking into account the maximum sound level LAmax of aircraft noise. The requirements related to LAmax are 2.0 to 7.8 dB higher than those associated with the equivalent sound level LAeq. If the number of flight operations at night reaches the allowed maximum number of forty, the requirements related to LAeq may be decisive. The requirements connected with LAeq according to PN-B-02151-02:1987 are 0.6 to 2.6 dB higher than coming from PN-B-02151-3:2015-10.
    Źródło:
    Vibrations in Physical Systems; 2019, 30, 1; 1-8
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of the damper blade position on the generated noise and pressure losses in plenum box with swirl diffusers
    Autorzy:
    Wójciak, Kamil
    Gaj, Patryk
    Kopania, Joanna
    Bogusławski, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/127800.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    HVAC
    noise emission
    sound power level
    pressure loss
    optimization
    emisja hałasu
    poziom mocy akustycznej
    strata ciśnienia
    optymalizacja
    Opis:
    The article presents the effect of setting the throttle in the plenum box with swirl diffuser on the generated noise and the pressure losses. The sound power levels of the source was determined using the precision method in the reverberation room in accordance with the PN-EN ISO 3741:2011 standard. The examination was carried out for damper blade position set vertically and horizontally for full opening and at a 45 degree angle in both directions. In order to confirm the universality of the conducted experiment, the tests were carried out for two different face swirl diffuser with different shapes of air control blades and holes in the plate and for different flow rates. The multi-criteria optimization methods were used to select the best throttle position.
    Źródło:
    Vibrations in Physical Systems; 2019, 30, 1; 1-8
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The noise emitted by a vacuum cleaner treated as a device with extensive sound sources
    Autorzy:
    Rukat, W.
    Jakubek, B.
    Madej, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/127827.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    devices with extensive sound sources
    DESS
    sound power level
    vacuum cleaner
    noise
    urządzenia z zewnętrznymi źródłami dźwięku
    poziom mocy akustycznej
    odkurzacz
    hałas
    Opis:
    Vacuum cleaners can be found in almost every household. They are one of the most intense noise sources there. Noise generated by vacuum cleaners is partially of mechanical, electrical and aerodynamic origin. A suction unit is the source of mechanical and electromagnetic noise. A suction nozzle or a cleaning head as well as a flexible hose that connects the components are sources of aerodynamic noise. The noise of the suction unit depends on the load and the technical condition of the motor. The noise of the nozzle and the hose depend on the flow capacity, presence of solid particles and the type of cleaned surface. The article presents a comparison of acoustic parameters of a vacuum cleaner working on various surfaces. In addition, the noise generated by the vacuum cleaner was compared according to the standard noise testing procedure and according to the definition of devices with extensive sound sources.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-8
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Noise emission from various shape rods at low-moderate Reynolds number
    Autorzy:
    Kopania, Joanna Maria
    Bogusławski, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2146658.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    noise
    circular square rods
    u-shape beam
    sound pressure level
    hałas
    pręt kołowy
    pręt kwadratowy
    belka w kształcie litery U
    poziom ciśnienia akustycznego
    Opis:
    Aeroacoustic source localization is an important experimental tool and the first step to know the mechanism of noise generation. The flow around the various shape of rods is one of the major aeroacoustic noise source mechanism. Such rods represent simple models for technical applications like part of the landing gear of planes, train pantographs, antennas, vehicles part, ventilation system or bridge. The purpose of this paper is to clarify the influence of the rod shape in the noise generation mechanism in a low-moderate Reynolds number. In this work, the situation when various shape rods are in the area of laminar-turbulent flow was analyzed. The measurements were carried out for single circular, square, c-shape rods to study the noise effect depended on the Reynolds number. The measurements were performed on the specially constructed test stand with the outlet to the anechoic room. The 1/3 SPL differential spectrum as 2-D noise maps were obtained for studied rods. The acoustic differences between circular, square and U-beam rods were observed.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021202
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies