Detecting the Inherent Modulation Phenomenon of High-Lift Configuration Noise Using the Hilbert–Huang Transform
Publication: Journal of Aerospace Engineering
Volume 37, Issue 4
Abstract
The phenomenon of multiple tones is a typical feature of high-lift configuration noise, and the underlying nonlinear and nonstationary features need to be revealed through time-frequency analysis. This paper introduces the Hilbert–Huang transform method to detect the inherent amplitude modulation and frequency modulation phenomena of multiple tones from 30P30N three-element high-lift configuration with both slat and flap completely stowed. The acoustic modes are extracted from the multiple tones firstly and then the variation features of amplitude and instantaneous frequency are analyzed. The results show that the acoustic energy concentrates on the primary mode with much larger amplitude. Moreover, both the amplitude and instantaneous frequency are periodically varied in time and the predicted modulation frequencies are equal to the frequency intervals between nearby tones, confirming that the inherent temporal features of multiple tones are amplitude modulation and frequency modulation.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work is financially supported by the National Natural Science Foundation of China (Grant No. 12002021) and the Laboratory of Aerodynamic Noise Control (governed by the China Aerodynamics Research and Development Center) under the grant code of ANCL20230104.
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Published In
Journal of Aerospace Engineering
Volume 37 • Issue 4 • July 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Sep 15, 2023
Accepted: Feb 6, 2024
Published online: Apr 13, 2024
Published in print: Jul 1, 2024
Discussion open until: Sep 13, 2024
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