Experimental research of nonlinear impedance of the orifices
The effect of sound pressure levels on the acoustic impedance of the orifices in the plate is investigated on the basis of measurements in an impedance tube using the two microphones method. A perforated diaphragms of 2 mm thickness with an orifices diameter of 4 mm were investigated.
The dependences of the resistance on the number of the orifices in nonlinear modes are obtained. It is shown that in the nonlinear mode, the resistance of the orifice does not depend on their number in the plate and is determined by the oscillatory velocity in the orifece. An analytical approximation
of the nonlinear resistance dependence on the oscillatory velocity in the orifice was carried out.
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Document Type: Research Article
Affiliations: 1: Bauman Moscow State Technical University. Moscow, Russia 2: Andreev Acoustics Institute. Moscow, Russia
Publication date: 30 September 2019
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