A new empirical model has been developed by the authors to predict the flow resistivity, acoustic impedance and sound absorption coeffcient of polyester fibre materials. The parameters of the model have been adjusted to best fit the values of airflow resistivity and sound absorption coeffcient measured over a set of 38 samples. Calculated results are compared with normal incidence measurements carried out using two different techniques: the transfer-function method in an impedance tube (ISO 10534-2) and the free-field impulse response method (ISO 13472-1). Measurements performed on polyester fibre materials with different density and thickness values, and diameter ranging from 18 to 48 lm, are in good agreement with the predictions of the new model. It is concluded that the new model can predict the basic acoustic properties of common polyester fibre materials with any practical combination of thickness and density.
Garai M., Pompoli F. (2005). A simple empirical model of polyester fibre materials for acoustical applications. APPLIED ACOUSTICS, 66, 1383-1398 [10.1016/j.apacoust.2005.04.008].
A simple empirical model of polyester fibre materials for acoustical applications
GARAI, MASSIMO;
2005
Abstract
A new empirical model has been developed by the authors to predict the flow resistivity, acoustic impedance and sound absorption coeffcient of polyester fibre materials. The parameters of the model have been adjusted to best fit the values of airflow resistivity and sound absorption coeffcient measured over a set of 38 samples. Calculated results are compared with normal incidence measurements carried out using two different techniques: the transfer-function method in an impedance tube (ISO 10534-2) and the free-field impulse response method (ISO 13472-1). Measurements performed on polyester fibre materials with different density and thickness values, and diameter ranging from 18 to 48 lm, are in good agreement with the predictions of the new model. It is concluded that the new model can predict the basic acoustic properties of common polyester fibre materials with any practical combination of thickness and density.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
