On impedance measurements for samples with non-linear acoustic properties
2008 (English)In: 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference), Vancouver, BC, 2008Conference paper (Refereed)
This paper discusses techniques for obtaining the acoustic properties of in-duct samples with non-linear acoustic characteristics such as perforates and other facing sheets used in aircraft engine liners and automotive mufflers. It is assumed that the non-linearity occurs locally at constrictions or sharp corners. The paper starts with a short review of previous impedance tube measurements made for determining the acoustic impedance of non-linear samples. Multi-port techniques using sinusoidal excitation for better characterization of samples with non-linear properties are developed and experimentally tested.
Place, publisher, year, edition, pages
Vancouver, BC, 2008.
, 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference)
Impedance measurement, Impedance tubes, Multi-port, Non-linear, Non-linear acoustics, Non-Linearity, Nonlinear properties, Sharp corners, Sinusoidal excitations, Aeroacoustics, Aircraft engines, Automobile mufflers, Paper sheeting, Acoustic impedance
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-61818ScopusID: 2-s2.0-78249247464ISBN: 9781563479397OAI: oai:DiVA.org:kth-61818DiVA: diva2:479707
14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference), Vancouver, BC, 5 May 2008 through 7 May 2008
QC 201202212012-01-182012-01-182012-02-21Bibliographically approved