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Wyszukujesz frazę "acoustic response" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    The Effects of Trunk Cavity and Air-Gaps in the Acoustic Response of a Passenger Vehicle
    Autorzy:
    Oktav, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/950216.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic coupling
    acoustic eigenfrequencies
    acoustic modes
    acoustic response
    air-gap
    cabin cavity
    Helmholtz resonator
    passenger vehicle
    trunk cavity
    wave number
    Opis:
    The effects of additional cavities and air-gaps in the acoustic response of a passenger vehicle are investigated. It is observed that the cabin cavity and the trunk cavity of the passenger vehicle are connected through an aperture in the rear seat. In the trunk cavity of the vehicle, there are two more air-gaps which are designed as countermeasures to trunk lid slam noise. It is established that acoustic modes and acoustic eigenfrequencies of the vehicle are altered through the trunk cavity and its air-gaps. To develop an analytical solution, the actual acoustic cavity is simplified into a rectangular shape. In the analytical solution, the coupling of trunk and cabin cavities is considered. It is shown that the computational analysis results match well with the results of the analytical solution proposed. Further, the resonator effect of air-gaps present in the trunk cavity is examined.
    Źródło:
    Archives of Acoustics; 2017, 42, 3; 433-440
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Acoustics of the Catacombs
    Autorzy:
    Iannace, G.
    Trematerra, A.
    Qandil, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/950219.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    catacombs
    acoustic measurements
    reverberation time
    impulse response
    Opis:
    The catacombs are underground places. This paper reports the results of acoustic measurements carried out inside the catacombs of “San Gennaro” (Naples) and in those one of “San Callisto” (Rome). Originally the catacombs were also used to perform sacred functions, although we don’t know the type of these functions i.e. if they were spoken, sung or performed as psalms. This paper presents acoustic measurements carried out in catacombs using the impulse response method, and by the analysis of the monaural acoustic parameters, (T30, EDT, C80, D50 and STI), the authors intend to understand the type of religious ceremony performed in the catacombs. If the catacombs had been reverberant places, they could not have been used for prayers because the echoes would have created difficulties in concentration and meditation for the devotees due to the poor speech comprehension.
    Źródło:
    Archives of Acoustics; 2014, 39, 4; 583-590
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect Analysis of Loudspeaker’s Placement Angle and Direction on Frequency Response and Sound Pressure Level in TV Applications
    Autorzy:
    Demirel, Ibrahim
    Powiązania:
    https://bibliotekanauki.pl/articles/1953509.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    acoustic transducers
    frequency measurement
    frequency response
    loudspeakers
    Opis:
    In a television, obtaining a good acoustic response is a challenging issue because of slim mechanical structures. The area dedicated for speaker’s placement is limited and inadequate space inside the cabinet of a TV prevents possible solutions to increase the sound performance. In addition, frame of the TV’s is getting narrower as the customers searching for the highest screen to body ratio. These designing aspects restrain optimal speaker positioning to achieve good sound performance. In this paper, an analysis related to speaker’s placement and mounting angle is proposed. A rotation setup compatible with a TV was prepared to measure different facing position of the speaker. This paper proposes the analysis of speaker’s rotation and facing direction in a flat panel television and its effects on sound pressure level together with deviation of the acoustic response. Measurement results are analyzed with an audio analyzer together with a statistics tool to achieve precise results.
    Źródło:
    Archives of Acoustics; 2021, 46, 1; 79-85
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Modelling Studies of 400 MHz ST-X Quartz SAW Delay Lines for Potential Gas Sensing Applications
    Autorzy:
    Thirumal, V.
    Raju, B.
    Gandhi, P.
    Pandya, H. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/177740.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface acoustic wave
    SAW delay line
    impulse response model
    equivalent circuit model
    coupling-of-modes
    COM model
    SAW sensors
    Opis:
    Surface Acoustic Wave (SAW) devices like delay lines, filters, resonators etc., are nowadays extensively used as principal solid state components in many electronic applications and chemical vapour sensors. To bring out the best from these SAW devices, computational design and modelling are resorted too. The present paper proposes the modelling of 400 MHz ST-X Quartz based SAW delay line, by three models namely, Impulse Response Model (IRM), Crossed-field Equivalent Circuit Model (ECM) and Coupling-of-Modes (COM) model. MATLAB® is employed as a computational tool to model the experimental output of the SAW device. A comparative discussion of the modelled device results is also provided.
    Źródło:
    Archives of Acoustics; 2018, 43, 2; 153-161
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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