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The use of the two-port method to characterize high-speed small fans
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0001-7898-8643
DYSON, Tetbury Hill, Malmesbury SN16 0RP, England..
2019 (English)In: Applied Acoustics, ISSN 0003-682X, E-ISSN 1872-910X, Vol. 146, p. 155-163Article in journal (Refereed) Published
Abstract [en]

One way to obtain a complete characterization of a sound source in a duct is to measure two-port data, comprising of the source scattering matrix and the source cross-spectrum. The present paper discusses in detail the design and construction of a two-port rig to characterize high speed small fans. A new post-processing method is suggested for the source cross-spectrum data and is compared to an earlier published method. The new method is shown to behave better in highly reflective cases, but is more sensitive to flow noise. In some cases, the duct diameter is not equal to the diameter of the test object. An adaptor can then be used to match the diameters, but it will modify the two-port results. In the present paper a method to remove the adaptor influence on the measured scattering matrix and source vector is presented, and validated by measurements.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2019. Vol. 146, p. 155-163
Keywords [en]
Two-port measurements, Test rig, Small fans
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-244497DOI: 10.1016/j.apacoust.2018.11.005ISI: 000457662400017Scopus ID: 2-s2.0-85057038584OAI: oai:DiVA.org:kth-244497DiVA, id: diva2:1299704
Note

QC 20190328

Available from: 2019-03-28 Created: 2019-03-28 Last updated: 2019-04-04Bibliographically approved

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Garnell, EmilÅbom, Mats

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