The Total Acoustic Power of a Clamped Circular Plate Located at the Boundary of Three-Wall Corner Region |
| K. Szemelaa, W.P. Rdzaneka and D. Pieczonkab
aDepartment of Acoustics, Institute of Physics, University of Rzeszów, Rejtana 16A, 35-310 Rzeszów, Poland bStylem, 36-001 Trzebownisko 614, Podkarpackie, Poland |
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| The energetic aspect of the sound radiation has been analyzed in the case of the three-wall corner region. This region is the part of space bounded by three baffles arranged perpendicularly to one another. The Neumann boundary value problem has been solved assuming that the sound source is the vibrating circular plate embedded in one of the baffles of the three-wall corner region. The Kelvin-Voigt theory of a visco-elastic plate has been used which allows to include internal attenuation existing in the plate material. It has been assumed that the sound source is excited to vibrations by the external pressure asymmetrically distributed on the plate surface. The modal coefficients of the acoustic impedance have been obtained in the form: of the expressions containing single integrals only. The formula describing the acoustic power of the analyzed sound source has been presented as a fourfold infinite series containing the modal coefficients of the acoustic impedance. The influence of some asymmetric excitations on the acoustic power has been analyzed. The possibilities of the modelling some uniform excitations located on the plate fragment of the small area by the point force excitation has been examined. The influence of the transverse baffles on the acoustic power has also been investigated. It has been determined for which frequency the baffles influence on the acoustic power is the greatest. |
| DOI: 10.12693/APhysPolA.119.1050 PACS numbers: 43.20.Ks, 43.20.Rz, 43.40.+s, 43.20.-f, 43.20.+g |