Analytical Harmonic Method for Modeling High-Frequency Oscillation With Applications to Aircraft Piston Pump Vibration Analysis

Analytical Harmonic Method for Modeling High-Frequency Oscillation With Applications to Aircraft Piston Pump Vibration Analysis

Undesired oscillations are often encountered in controlled systems at steady state due to high-frequency (HF) periodic disturbance and/or feedback noises. This article presents a computationally efficient alternative to derive an analytical harmonic model (AHM) that expresses the oscillatory variabl...

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Bibliographic Details
Published in:IEEE/ASME transactions on mechatronics 2021-04, Vol.26 (2), p.918-929
Main Authors: Li, Lei, Lee, Kok-Meng, Ouyang, Xiaoping, Yang, Huayong
Format: Article
Language:eng
Subjects:
Aircraft
Aircraft control
Aircraft vibration
Analytical harmonic model (AHM)
Analytical models
Atmospheric modeling
Feedback
feedback noises
Hafnium
Harmonic analysis
Oscillators
piston pump
Steady state
swash-plate oscillation
Torque
Vibration analysis
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Summary:Undesired oscillations are often encountered in controlled systems at steady state due to high-frequency (HF) periodic disturbance and/or feedback noises. This article presents a computationally efficient alternative to derive an analytical harmonic model (AHM) that expresses the oscillatory variable as a series of harmonic kernel vectors and a position-independent harmonic amplitude vector for identifying the dominant harmonic components of the undesired effects on the manipulated variables. Illustrated in the context of an aircraft pressure-controlled piston pump (PC-PP) where the pressure feedback pulsations and the torque disturbances from the piston/slipper assemblies lead to HF swash-plate (SP) oscillation at steady state, the AHM and its significance were investigated experimentally on a PC-PP test-rig capable of simultaneously measuring the HF feedback pressure and SP-angle. Good agreements between the experimental and numerical results validate the AHM, and reveal that the HF SP-oscillation is dominated by its fundamental harmonic component, and primarily contributed by the disturbance torque.
ISSN:1083-4435
1941-014X