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Wyszukujesz frazę "acoustic radiation" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Comparison of numerically determined noise of a 290 kW induction motor using FEM and measured acoustic radiation
    Autorzy:
    Nahlaoui, M. Al
    Steins, H.
    Kulig, S.
    Exnowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/140646.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inverter-fed
    induction motor
    asynchronous machine
    acoustic radiation
    modal analysis
    Opis:
    In this paper a comparison of numerically determined and measured electromagnetically exited noise of an induction motor is presented. The calculations are accomplished using FEM for an example motor, which is a 290 kW inverter-fed asynchronous machine. The approach starts with the electromagnetic and mechanical consideration. The focus is set on acoustic considerations, which contain the 3D-FE-model and measurement setup in the sound chamber.
    Źródło:
    Archives of Electrical Engineering; 2013, 62, 2; 195-207
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The acoustic power radiated by a circular membrane excited for vibration both by means of the edge and by external surface load
    Autorzy:
    Szemela, K.
    Rdzanek, W. P.
    Rdzanek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/176879.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic radiation power
    vibrations of a spherical membrane
    excitation produced by edge and surface loads
    amplitude-phase effects
    Opis:
    In this paper the acoustic power of the circular membrane, excited both by the edge and external exciting forces uniformly distributed over the whole surface, is examined. Some different amplitudes of exciting factors and some differences between the phases of excitations were considered. It has been assumed that the source of a sound is located in a flat, rigid and infinite baffle and is sourrounded by a lossless and homogeneous fluid medium. The vibrations are axisymmetric and time-harmonic. Employing the Cauchy's theorem of residues and asymptotic formulae for the Bessel functions, the asymptotes for active and reactive power consisting of elementary functions are obtained. The acoustic power radiated by the membrane was shown graphically in terms of the parameters describing both kinds of excitations.
    Źródło:
    Archives of Acoustics; 2005, 30, 1; 109-119
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanisms of Aerosol Sedimentation by Acoustic Field
    Autorzy:
    Kudryashova, O.
    Antonnikova, A.
    Korovina, N.
    Akhmadeev, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/177094.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fine aerosol
    size distribution
    acoustic impact
    coagulation
    sedimentation
    radiation pressure
    Opis:
    Acoustic radiation sources are successfully applied to cleaning rooms from dust of fairly large particle sizes (ten micrometers and larger). The sedimentation of fine aerosols (particle diameter of 1–10 microns) is a more complicated challenge. The paper is devoted to the substantiation of the acoustic sedimentation method for such aerosols. On the basis of the mathematical model analysis for aerosol sedimentation by the acoustic field the mechanisms of this process have been determined and include the particle coagulation acceleration and radiation pressure effect. The experimental results of the acoustic sedimentation of a model aerosol (NaCl) are shown. The calculation results according to the mathematical model for coagulation and sedimentation, on the basis of the Smolukhovsky’s equation taking into account various mechanisms of aerosol sedimentation by sound depending on the particle sizes and sound intensity, are given. The necessity to use intensive sources of high-frequency sound has been confirmed, suggesting that these sources must be located above dust clouds.
    Źródło:
    Archives of Acoustics; 2015, 40, 4; 485-489
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sound Radiation from a Roundabout
    Autorzy:
    Piddubniak, O.
    Piddubniak, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/177962.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    roundabout
    car sound radiation
    stationary phase method
    acoustic pressure
    power flow density
    Opis:
    Sound propagation from the vehicles moving on the city roundabout, with taking into account the wind is investigated. Solution of the problem for one moving sound source is found by means of the integral Fourier transforms extended over space variables and time. Inverse transforms are calculated approximately, using a stationary phase method and iterative technique. The solution for a general problem is obtained as a superposition of many partial solutions. The numerical analysis of noise characteristics is performed for the three-way Korfanty roundabout case in Łódz.
    Źródło:
    Archives of Acoustics; 2010, 35, 3; 437-456
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation for Acoustic Radiation Force from Rectangular Weakly Focusing Transducer Using the Ray Acoustic Model
    Autorzy:
    Yu, Lili
    Qiao, Shuchang
    Shou, Wende
    Li, Junhua
    Powiązania:
    https://bibliotekanauki.pl/articles/2141691.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    radiation force calculation
    ray acoustic model
    rectangular weakly focusing transducer
    far-field integration
    Opis:
    Based on the ray acoustic model, a new relationship between the radiation force and the acoustic power is studied for a rectangular weakly focusing transducer. The effect of pressure reflection coefficient on this model is discussed. For a totally absorbing target, an approximate closed-form expression is also derived and the performance of this model is compared with that of the far-field integration model. The numerical results show that the agreement is excellent with these two models, which can be both used for correction of measured results, but the formula based on the ray acoustic model can be applied more widely in practice because of its simpler expression. The experimental results show further the effectiveness of the relationship between radiation force and acoustic power for rectangular weakly focusing transducer based on the ray acoustic model. The results presented in this paper are important for application of ultrasound transducers in therapy.
    Źródło:
    Archives of Acoustics; 2022, 47, 1; 81-88
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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