DOAJ Open Access 2021

A comment on the correct boundary conditions for the Cremer impedance

Mats Åbom Stefan Jacob

Lihat Sumber DOI

Abstrak

Mode merging and the creation of exceptional points can be used to create optimum damping in a lined duct, as pointed out by Cremer [Acustica 3, 249–263 (1953)]. The effect of a mean flow has traditionally been analyzed by assuming the Ingard–Myer boundary condition at the wall. For low frequencies, however, the classical boundary condition is a better alternative. This paper shows that this choice removes two problems with the low-frequency solution: the negative real part of the optimum wall impedance and the non-valid solution for the upstream case. Theoretical derivations are complemented by numerical results to support these conclusions.

Topik & Kata Kunci

Acoustics. Sound

Penulis (2)

Mats Åbom

Stefan Jacob

Format Sitasi

APA MLA BibTeX

Åbom, M., Jacob, S. (2021). A comment on the correct boundary conditions for the Cremer impedance. https://doi.org/10.1121/10.0003546

Akses Cepat

Lihat di Sumber doi.org/10.1121/10.0003546

Informasi Jurnal

Tahun Terbit: 2021
Sumber Database: DOAJ
DOI: 10.1121/10.0003546
Akses: Open Access ✓