Informacja

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

Wyszukujesz frazę "Hałas, Ireneusz" wg kryterium: Wszystkie pola


Wyświetlanie 1-3 z 3
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 1-3 z 3

    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