APPROXIMATED EVALUATION OF A RIGID ACOUSTIC CAVITY COUPLED ON A FLEXIBLE BOARD IN A FREE VIBRATION

Authors

  • Agnaldo Antonio Moreira Teodoro da Silva UnB
  • Marcus Vinícius Girão de Morais UnB

DOI:

https://doi.org/10.26512/ripe.v2i35.21418

Keywords:

Acoustic cavity rigid. Flexible plate. Approximation normal mode. Free vibrations.

Abstract

The study of the acoustic behavior of a cavity depends on factors such as acoustic wavelength, cavity dimensions, the effect of flexible interface structures, making it relatively complex problem. Due to the complexity of the problem it’s sought simplified methods for the purpose techniques analysis applied with greater ease. Pretlove and Craggs (1969) presented a two-dimensional analysis of a cavity coupled to a plate using the normal mode as an approximation for explaining experimental results and then compared with results obtained by other authors. Recently Rojas (2015) presented an analytical solution to a rigid acoustic cavity coupled to a flexible plate in free vibration using an approximation by weighted residuals (Galerkin Ritz). The present study performed an analysis adding another modal forms to the Pretlove and Craggs’ works (1969) in order to evaluate the method’s efficiency. The comparisons with the Pretlove’s (1965) semi-analytical results and with the Rojas’ (2015) analytical results are the validation of this present study, checking a good approximation with the results.

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References

Ferreira, A. Comparação analítica numérica de cavidades acústicas e vibroacústicas. Dissertação de Mestrado, Universidade de Brasilia, Brasilia DF FT Departamento de Engenharia Mecânica, 2012.

Pretlove, A. J. Free vibrations of a rectangular panel backed by a closed rectangular. Journal of Sound Vibration, England, v. 3(2), p. 197 - 209, 1965.

Pretlove, A. J.; Craggs, a. A Simple Aproach To Coupled Panel-Cavity Vibrations. Journal of Sound Vibration, England, v. 11 (2), 207 - 215 1969.

Ribeiro, P. Soluções Analíticas para Cavidades Acústicas Bidimensionais com aplicação ao Estudo de Problemas de Interação Dinâmica Barragem-Reservatório.Tese de Doutorado, Universidade de Brasilia, Brasilia DF, FT Departamento de Engenharia Civil e Ambiental, 2010.

Rojas Huacanca, J. R. Solução Analítica de uma Cavidade Acústica Rígida Acoplada a uma Placa. Universidade de Brasília. Faculdade UnB Gama. Distrito Federal, p. xvi, 118 p. 2015.

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Published

2017-08-22

How to Cite

Teodoro da Silva, A. A. M., & Morais, M. V. G. de. (2017). APPROXIMATED EVALUATION OF A RIGID ACOUSTIC CAVITY COUPLED ON A FLEXIBLE BOARD IN A FREE VIBRATION. Revista Interdisciplinar De Pesquisa Em Engenharia, 2(35), 79–96. https://doi.org/10.26512/ripe.v2i35.21418