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- W2895797797 abstract "The equations of Delany and Bazley have been widely used in the study of the behavior of sound waves inside porous materials since 1970. However, as is known, the validity of these equations for low frequencies can produce physically inconsistent results. This work intends to evaluate the sound absorption coefficient of two types of absorbent material, one porous and one fibrous, with the Allard and Champoux's equations presented in 1992. These equations have the purpose of improving acoustic properties characterization at a low frequency. The precision of the results obtained through the two empirical methods is verified with an experimental evaluation using the modified two cavity method. The measurements are made on the impedance tube with the samples arranged in two different positions displaced from the rigid termination. Porous samples evaluated by this work were common foam and the fibrous were coconut coir fibers." @default.
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- W2895797797 date "2018-09-01" @default.
- W2895797797 modified "2023-09-26" @default.
- W2895797797 title "Comparative study of the sound absorption coefficient of two absorbent materials with two empirical methods for low frequency" @default.
- W2895797797 doi "https://doi.org/10.1121/1.5068138" @default.
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