Eigenvalue analysis for acoustic multi-ports

Acoustic multi-ports are commonly used to describe the scattering (the transmission and reflection) and the source of aero-acoustic components in duct and pipe systems. The components are therefore modeled as “black-boxes,” assuming linear and time invariant systems. Using linear network theory, two...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2017-05, Vol.141 (5), p.3614-3614
Main Authors: Sack, Stefan, Åbom, Mats
Format: Article
Language:English
Online Access:Get full text
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Summary:Acoustic multi-ports are commonly used to describe the scattering (the transmission and reflection) and the source of aero-acoustic components in duct and pipe systems. The components are therefore modeled as “black-boxes,” assuming linear and time invariant systems. Using linear network theory, two components can be combined to a cascade for which the scattering and sources are predicted. This step, however, requires decoupled components; the flow disturbances downstream of an aero-acoustic source can be large and turbulences impinging on the downstream component may change its acoustic properties. In this presentation, we show how to use eigenvalue equations in order to investigate this so called “installation-effect” on both, the scattering and the source of induct components. The theoretical results are compared with measurements in order to conclude on the changing source and scattering mechanisms.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.4987748