Prediction of acoustic surface impedance of bulk reacting lining with grazing flow
2014 (English)In: 21st International Congress on Sound and Vibration 2014, ICSV 2014, International Institute of Acoustics and Vibrations , 2014, 2332-2339 p.Conference paper (Other academic)
A transfer matrix methodology to determine the acoustic properties of multi-layered absorbers in different environments is proposed in this paper. The methodology allows inclusion of grazing flow and the boundary layer effects on the surface properties, avoiding the need of several complementary methods to obtain the surface properties of a sound reducing material in a specific environment. The predicted surface properties are given as a function of angle of sound incidence, allowing for arbitrary sound fields to be simulated. This is a useful tool in for example automotive applications such as engine bays where multi-layered bulk reacting sound absorbing materials are exposed to flow and complex sound fields. Correct prediction of the acoustic performance of absorbing material where flow is present enables optimization of the noise reducing components for which conflicting requirements such as weight and space constraints are present as well.
Place, publisher, year, edition, pages
International Institute of Acoustics and Vibrations , 2014. 2332-2339 p.
Acoustic field measurement, Acoustic fields, Acoustic impedance, Acoustic properties, Acoustic wave absorption, Acoustics, Boundary layers, Transfer matrix method, Absorbing materials, Acoustic performance, Automotive applications, Boundary layer effects, Complementary methods, Sound absorbing materials, Space constraints, Surface impedances, Surface properties
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-167038ScopusID: 2-s2.0-84922646339ISBN: 9781634392389OAI: oai:DiVA.org:kth-167038DiVA: diva2:813178
21st International Congress on Sound and Vibration 2014, ICSV 2014, 13 July 2014 through 17 July 2014
QC 201602072015-05-212015-05-212016-09-20Bibliographically approved