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Analysis of the acoustical behavior of cavities using impedance functions

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Abstract

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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Acknowledgments

The authors gratefully acknowledge to the Instituto de Aeronáutica e Espaço (IAE), Instituto Tecnológico de Aeronáutica (ITA) and Universidade Federal de Ouro Preto (UFOP) for the support.

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Authors and Affiliations

  1. Departamento de Eng. de Controle e Automação, Escola de Minas, Universidade Federal de Ouro Preto (UFOP), Campus Morro do Cruzeiro, Ouro Preto, Minas Gerais, Brazil

    Gustavo Paulinelli Guimarães

  2. Divisão de Integração e Ensaios, Instituto de Aeronáutica e Espaço (IAE), Praça Marechal Eduardo Gomes, 50, São José dos Campos, São Paulo, Brazil

    Rogério Pirk & Carlos D’Andrade Souto

  3. Programa de Pós-Graduação em Ciências e Tecnologias Espaciais, Instituto Tecnológico de Aeronáutica (ITA), Praça Marechal Eduardo Gomes, 50, São José dos Campos, São Paulo, Brazil

    Rogério Pirk & Carlos D’Andrade Souto

  4. Divisão de Engenharia Mecânica, Instituto Tecnológico de Aeronáutica (ITA), Praça Marechal Eduardo Gomes, 50, São José dos Campos, São Paulo, Brazil

    Luiz Carlos Sandoval Góes

Authors
  1. Gustavo Paulinelli Guimarães
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  2. Rogério Pirk
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  3. Carlos D’Andrade Souto
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  4. Luiz Carlos Sandoval Góes
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Corresponding author

Correspondence to Gustavo Paulinelli Guimarães.

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Technical Editor: Fernando Alves Rochinha.

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Guimarães, G.P., Pirk, R., Souto, C.D. et al. Analysis of the acoustical behavior of cavities using impedance functions. J Braz. Soc. Mech. Sci. Eng. 38, 1103–1111 (2016). https://doi.org/10.1007/s40430-015-0428-z

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  • DOI: https://doi.org/10.1007/s40430-015-0428-z

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