The Error Suppression of an Experimental Over-Determination of In-Duct Flow Noise Sources
2010 (English)In: 16th AIAA/CEAS Aeroacoustics Conference, Stockholm, June 2010, 2010, 1-19 p.Conference paper (Refereed)
The full aeroacoustic two-port measurement procedure in flow ducts involves the determination of a scattering matrix and a source term. In this paper, the improved error suppression of a recently developed over-determination technique for the source is investigated. By inducing disturbances in the reflection coefficients it is shown that by applying the over-determination the accuracy is improved. For errors introduced via the scattering matrix the results are identical regardless of method applied. From measurements it is shown that random errors in the microphone data are better suppressed using the over-determination method. While this is true for bias errors due to external sound sources as well, the accuracy is unsatisfying when the external source generated sound is more than about 3 dB louder than that of the two-port source.
Place, publisher, year, edition, pages
2010. 1-19 p.
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-26140ScopusID: 2-s2.0-78649590915OAI: oai:DiVA.org:kth-26140DiVA: diva2:370443
16th AIAA/CEAS Aeroacoustics Conference
FunderSwedish Research Council
QC 201011182010-11-162010-11-162016-06-08Bibliographically approved