Analysis of the acoustical behavior of cavities using impedance functions.
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2016
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Resumo
The acoustic design of cavities is an important
task in a variety of engineering applications, from automotive
or aerospace industries to equipment coating designs.
In this work, the acoustic impedance functions (a frequency
domain model) were calculated using analytical, numerical,
and experimental methods. Those different approaches
were presented in a unified manner in order to allow
comparisons among them. The relationship of the impedance
function and a classical frequency response function
(FRF) was also established. A circular duct of rigid walls
was assumed with different boundary conditions as closed
end, as well as opened and absorbed extremities. Three
duct configurations were implemented in order to compare
analytical, numerical, and experimental results. Finally, it
could be possible to evaluate some aspects that are characteristic
of a large range of acoustic systems applications as
the existence of complex modes and frequency-dependent
behavior of absorption material. This study aims the usage of the impedance functions to analyze the acoustic behavior
of cavities, as well as to compose the background in
order to develop, in the future, an acoustic modeling process
using impedance functions.
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Palavras-chave
Acoustics, Acoustic cavity, Experimental modal analysis, Impedance function
Citação
GUIMARÃES, G. P. et al. Analysis of the acoustical behavior of cavities using impedance functions. Journal of the Brazilian Society of Mechanical Sciences and Engineering, v. 38, n. 4, p. 1103-1111, abr. 2016. Disponível em: <https://link.springer.com/article/10.1007/s40430-015-0428-z>. Acesso em: 24 jul. 2017.