期刊
JOURNAL OF SOUND AND VIBRATION
卷 333, 期 16, 页码 3818-3830出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2014.04.005
关键词
-
资金
- NASA Fixed Wing project
- ATA Engineering, Inc. [SAA3-1239]
Counter-rotating open rotor acoustic measurements were processed using a two-shaft Vold-Kalman order tracking filter, providing new insight into the complicated noise generation mechanisms of this type of system. The multi-shaft formulation of the Vold-Kalman filter can determine a time-accurate output of shaft order tones associated with each rotor, even as the rotation rate of the two rotors varies. This is a major improvement over the usual short time Fourier transform method for many applications. It was found that the contribution from each rotor to the individual tones varies strongly as a function of shaft order and operating condition. The order tracking filter is also demonstrated as a robust tool for separating the tonal and broadband components of a signal for which the usual shaft phase averaging methods fail. Published by Elsevier Ltd.
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