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Aerospace 2016, 3(3), 29; doi:10.3390/aerospace3030029

Improved Separation of Tone and Broadband Noise Components from Open Rotor Acoustic Data

1
Mechanical Engineering Department, Tuskegee University, Tuskegee, AL 36088, USA
2
Acoustics Branch, NASA Glenn Research Center, Cleveland, OH 44135, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Luís M. B. C. Campos
Received: 9 July 2016 / Revised: 5 September 2016 / Accepted: 13 September 2016 / Published: 20 September 2016
(This article belongs to the Special Issue Recent Advances in Aeroacoustics)
View Full-Text   |   Download PDF [3972 KB, uploaded 20 September 2016]   |  

Abstract

The term “open rotor” refers to unducted counter-rotating dual rotors or propellers used for propulsion. The noise generated by an open rotor is very complicated and requires special techniques for its analysis. The determination of its tone and broadband components is vital for properly assessing the noise control parameters and also for validating open rotor noise prediction codes. The data analysis technique developed by Sree for processing raw acoustic data of open rotors has been modified to yield much better results of tone and broadband separation particularly for the case when the two rotor speeds are approximately the same. The modified algorithm is found to eliminate most or all of the “spikes” previously observed in the broadband spectra computed from the original algorithm. A full description of the modified algorithm and examples of improved results from its application are presented in this paper. View Full-Text
Keywords: acoustic; broadband; open rotor; phase-shift; segment-pair; separation; spectrum; spike; tone acoustic; broadband; open rotor; phase-shift; segment-pair; separation; spectrum; spike; tone
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Sree, D.; Stephens, D.B. Improved Separation of Tone and Broadband Noise Components from Open Rotor Acoustic Data. Aerospace 2016, 3, 29.

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