The paper presents a completely new measurement technique of the sound absorption properties of materials, based on the measurements of active intensity and sound energy density. It allows one to measure the absorption coefficient with a wide band excitation, to use frequency bands of any width and to make measurements both inside a tube or in situ. The intensity technique is compared to Transfer Function Method (as defined in the ASTM E-1050 standard), by means of a complete theoretical study and of a large experimental validation. The results suggest that the new method is at least as accurate and reliable as the ASTM E-1050 standard. It also has many advantages: it is faster, easier, it directly produces results in 1/3 or 1 octave bands, it can be implemented with portable, low cost instrumentation.

Measurement of the sound absorption coefficient of materials with a new sound intensity technique / Farina, Angelo; A., Torelli. - STAMPA. - (1997), pp. 1-18. (Intervento presentato al convegno 102nd AES Conference tenutosi a Berlin nel 23-26 March 1997).

Measurement of the sound absorption coefficient of materials with a new sound intensity technique

FARINA, Angelo;
1997-01-01

Abstract

The paper presents a completely new measurement technique of the sound absorption properties of materials, based on the measurements of active intensity and sound energy density. It allows one to measure the absorption coefficient with a wide band excitation, to use frequency bands of any width and to make measurements both inside a tube or in situ. The intensity technique is compared to Transfer Function Method (as defined in the ASTM E-1050 standard), by means of a complete theoretical study and of a large experimental validation. The results suggest that the new method is at least as accurate and reliable as the ASTM E-1050 standard. It also has many advantages: it is faster, easier, it directly produces results in 1/3 or 1 octave bands, it can be implemented with portable, low cost instrumentation.
1997
Measurement of the sound absorption coefficient of materials with a new sound intensity technique / Farina, Angelo; A., Torelli. - STAMPA. - (1997), pp. 1-18. (Intervento presentato al convegno 102nd AES Conference tenutosi a Berlin nel 23-26 March 1997).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/1505436
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