Publications
Boundary condition for the acoustic impedance of lightweight micro perforated panels and membranes
Chenxi Li, Benjamin Cazzolato, Anthony Zander (2014)
21st International Congress on Sound and Vibration, Beijing, China, JulyAbstract:
Theories of the acoustic impedance of micro perforated panels and membranes for normally incident waves have been well developed for decades. These theories are mainly based on the assumption that the particle velocity at the boundary of the hole wall is equal to zero. This assumption is valid when the panel/membrane is massive and does not vibrate. This paper aims to investigate the effects of the panel/membrane vibration on the acoustic impedance of micro perforated structures. When the panel/membrane is lightweight and vibrates, the particle velocity at the boundary of the hole wall is assumed equal to the velocity of the panel/membrane vibration. Based on this alternate boundary condition a new expression for the acoustic impedance of micro perforated panels and membranes is developed. This expression may be used for the prediction of the sound absorption of lightweight micro perforated panels and membranes.
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