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Experimental Techniques for Aeroacoustics in Low Mach Number Confined Flows: Keynote Paper
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics.ORCID iD: 0000-0002-8474-8563
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics.ORCID iD: 0000-0001-7898-8643
2011 (English)In: Proceedings of the International Conference on Mechanical Engineering 2011(ICME2011) 18-20 December 2011, Dhaka, Bangladesh, ICME , 2011Conference paper, Published paper (Other academic)
Abstract [en]

Measurement of plane wave acoustic transmission properties, so called two-port data, of flow duct components is important in many applications such as in the development of mufflers for IC-engines. Measurement of two-port data is difficult when the flow velocity in the measurement duct is high because of the flow noise contamination of the measured pressure signals. The wall mounted pressure transducers normally used will pick up unwanted flow noise mainly in the form of turbulent pressure fluctuations. The problem is then obtaining a signal-to- noise ratio high enough for quality measurements. Techniques to improve acoustic two-port determination have been developed in this paper, including test rig design, signal processing techniques and over-determination.

Place, publisher, year, edition, pages
ICME , 2011.
Keyword [en]
Duct acoustics, two-port measurements, Flow noise suppression, Wave decomposition
National Category
Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:kth:diva-62455OAI: oai:DiVA.org:kth-62455DiVA: diva2:480362
Conference
International Conference on Mechanical Engineering, 18-20 December 2011, Dhaka, Bangladesh
Note

QC 20120412

Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2014-11-17Bibliographically approved

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