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    Wyświetlanie 1-5 z 5
    Tytuł:
    Application of the impulse response method in the test of acoustic properties of building materials
    Autorzy:
    Piechowicz, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2146655.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    impulse method
    sound absorption coefficient
    MLS
    e-sweep
    metoda impulsowa
    współczynnik pochłaniania dźwięków
    Opis:
    Understanding the acoustic properties of the materials used in the construction of wall surfaces, plays an important role in structural and environmental acoustics. There are many research methods for determining the acoustic parameters of building elements, such as the sound absorption coefficient, the sound reflection coefficient, or the sound insulation index determined in the laboratory or in situ. This work focuses on the determination of the sound absorption coefficient and the possibility of its measurement in "in situ" conditions by the impulse response method. The main purpose of the presented research was to check whether it is possible to use the impulse method in a small reverberant room to determine the sound absorption coefficient of a small part of the wall structure.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021201
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of sound power level of machine by inverse method
    Autorzy:
    Piechowicz, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2146645.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    inverse method
    sound power
    sound pressure level
    sound measurement
    metoda odwrotna
    moc akustyczna
    poziom ciśnienia akustycznego
    pomiar dźwięku
    Opis:
    The paper presents the inverse method to estimate the sound power level of machines operated in industrial environments. Values of the partial sound power sources of machine components could be predicted based on the distribution of sound field parameters measured around the machine. Assigning partial sound power levels of machine components allows for the effective selection of efficient noise protection solutions for this machine. Measurements were carried out in an actual mechanical workshop. The multichannel measurement system for simultaneous recording of sound pressure levels and the angle of phase angle shift was used in measurements. Based on the determined the sound power of partial sources, the A-weighted sound pressure levels at the operator's workplace were determined.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 1; art. no. 2021113
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of predictive model for vibro-acoustic protections in industrial hall
    Autorzy:
    Piechowicz, Janusz
    Piechowicz, Jakub
    Powiązania:
    https://bibliotekanauki.pl/articles/128118.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    noise
    workstation
    predicting software
    work environment
    hałas
    stanowisko pracy
    oprogramowanie przewidujące
    środowisko pracy
    Opis:
    The paper presents stages of developing a prognostic model for implementing noise protection in an industrial hall. The main source of vibroacoustic problems is the glass hardening furnace, which was installed in a new production hall. It generates vibroacoustic problems at the furnace operators' work stations and at work stations at other devices placed in this hall and in the adjacent hall. These problems are mainly result from mistakes made during the preparation of the furnace placement, as well as the assembly of the machine and accessories. The conducted vibroacoustic tests were aimed at diagnosing problems and developing appropriate ways to minimize the risk of noise and vibration hazards. The basic research tool was to create the correct hall acoustic model, determine the sound power of partial sources and calibrate the model. Modelling the sound protection efficiency of each noise reducing element has allowed the selection of appropriate solutions in terms of acoustic efficiency and approximate application costs. Measurements were carried out according to standard procedures. The article presents only some of the results of vibroacoustic tests directly related to the developed acoustic model. Analysis of vibration paths and noise propagation, indication of assembly defects is a recommendation to formulate vibroacoustic requirements for newly installed devices.
    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:
    Improving the sound environment of the city park
    Autorzy:
    Gola, Sylwia
    Piechowicz, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/24201992.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    soundscape
    city park
    sound environment
    krajobraz dźwiękowy
    park miejski
    środowisko dźwiękowe
    Opis:
    A city park is a place where, in an urbanized world, a person can experience nature. A park is the green lung of the city. The numerous trees and shrubs in parks improve the air condition, especially in densely populated agglomerations. It is a meeting place and allows you to spend time actively. The park allows recreation and relaxation for city residents. City parks are desirable, especially in city centres, densely populated and built-up places. Designing parks should meet people's needs. It is extremely important to properly select space elements that will positively affect the comfort of use. Apart from the obvious issue of taking care of the park's aesthetics, its flora and appropriate equipment, an important role is played by an appropriate acoustic climate. Hence, when designing open spaces such as city parks, the cooperation of specialists in many fields is important: landscape architects, town planners, people dealing with nature protection, artists, and finally, acousticians. This allows you to create a space that will meet the needs and expectations of residents. The paper shows the possibility of taking steps to correct the existing sound environment in selected places in the city park.
    Źródło:
    Vibrations in Physical Systems; 2023, 34, 1; art. no. 2023105
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soundscape Analysis of Selected Landforms on Spitsbergen
    Autorzy:
    Czopek, Dorota
    Małecki, Paweł
    Piechowicz, Janusz
    Wiciak, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/176582.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Arctic soundscape
    soundscape analysis
    Svalbard
    Spitsbergen
    Longyearbyen
    Opis:
    This article shows acoustic measurements from Svalbard archipelago in the Arctic, located in the Arctic Ocean. The aim of the research was to show the Svalbard soundscape as well as to record and analyse the spatial-temporal dynamics of the acoustic environment, the human impact on the soundscape and to collect baseline data for future comparative research. Svalbard is interesting for many science disciplines because it has an arctic climate and, at the same time, it is relatively easily accessible. Climatologists, geologists, glaciologists, biologists and even anthropologists could find interesting themes to investigate here. Additionally, the soundscape of Spitsbergen is worthy of detailed examination. This paper presents comparative analysis of the soundscape of various spots near Longyearbyen in Management Area 10. The soundscape analysis of selected valleys shows the strong influence of human activity on the soundscape as well as the variability and characteristic features of the natural Arctic soundscape.
    Źródło:
    Archives of Acoustics; 2019, 44, 3; 511-519
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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