INVESTIGATION OF THE REASON FOR THE DIFFERENCE IN THE ACOUSTIC LINER IMPEDANCE DETERMINED BY THE TRANSFER FUNCTION METHOD AND DEAN´S METHOD
The article considers the reason for the difference in the results of determining the impedance of the single-layer acoustic
liner samples by different methods during the operation in a normal incidence impedance tube. The operation of the normal incidence impedance tube was simulated by numerical solution of the Navier-Stokes equations. The data obtained from the numerical simulation were processed by the transfer function method and Dean’s method. A direct determination of the liner impedance, based on the ratio of the acoustic pressure to the acoustic normal velocity, was used to find out the reasons for the difference in impedance values. The analysis was carried out in the frequency range close to the resonance. It was shown that the transfer function method determines the impedance of the sample face, and the Dean’s method determines the impedance of the one cell only.
How to Cite
Copyright (c) 2021 Igor Khramtsov, Oleg Kustov, Vadim Palchikovskiy, Victor Ershov
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Journal Akustika is peer reviewed journal indexed in Scopus database and
Web of Science. The content of this magazine is protected by copyright.
Dissemination or further disclosure of the content of journal or its parts to
the public without prior consent of the publisher, is expressly prohibited.