2. Metrology of the acoustic properties of absorbent materials
2.1 Physical parameters and acoustic properties
In paragraph 1 , an asymptotic study at low and high frequencies highlighted the importance of a number of parameters characteristic of the internal geometry of a porous material. Models for predicting the acoustic behavior...
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Metrology of the acoustic properties of absorbent materials
Low-frequency ultrasonic characterization of porous materials
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Appendix: equivalent fluid
The "effective density" and "effective modulus of compressibility" functions of the equivalent fluid must be suitably represented by the following approximate models:
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