Supersonic acoustic intensity : implementation and evaluation / Intensidade acustica supersonica : implementação e verificação

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

This work presents an experimental implementation and evaluation of the acoustic parameter named Supersonic Acoustic Intensity (SAI) which permits determining the part of the acoustic intensity of sound source that will be radiate to farfield. This parameter permits quantify precisely the radiation efficiency or acoustic radiator to solve the vibroacoustic problems. SAI had origin from Nearfield Acoustic Holography (NAH) it has as objective identify the regions of the sound source that contribute to the sound power radiated to the far field (supersonic) filtered out as a result the part of the sound recirculating and evanescence waves (subsonic). The work presents a brief theoretical review of the planar acoustic holography fundaments using the Fourier Transformed and its extension to obtain the supersonic acoustic intensity. With base in the NAH for coordinates systems (planar holography) it was implemented in MatLab language an algorithm from the SAI calculus and simulation in planar structure type plate were achieved. The simulated results were verified through experimental measurements in a realistic plate with the same properties, dimension, initial conditions and boundaries. The results obtained are analyzed and discussed.

ASSUNTO(S)

som - intensidade vibração - medição vibroacoustic vibração ondas acusticas superficiais nearfield acoustic holography supersonic acoustic intensity holografica acustica

ACESSO AO ARTIGO

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