The aeroacoustic noise influence of retractable assembly on aircraft surface is researched. Aeroacoustic noise of different points on airframe is calculated for comparison between the airplane contains retractable assembly and a smooth surface airplane. The change of noise and the distribution of noise source caused by retractable assembly on aircraft surface can be obtained. A pilot ear-level plane is built for sound pressure level calculation on cockpit noise. The effect of the device protruded and retracted on the cockpit noise is analyzed. The results show that the main noise sources are distributed near protrusive pipe area and on the wall of intake cavity. The noise in middle of cabin is stronger than that in front and behind of cabin. When the retractable assembly is protruded, the noise increase from 6dB to 13dB. The noise spectrum is continuous and has characteristic of broad band, and the noise increase with the Mach number. The noise is in low frequency when retractable assembly is protruded and the noise is in medium-high frequency when the device is retracted. The results can provide technical foundation for the future aircraft noise reduction design.
Study on Aeroacoustic Noise Effect on Cockpit of Retractable Aerial Refueling Assembly
Lect. Notes Electrical Eng.
Proceedings of the 5th China Aeronautical Science and Technology Conference ; Kapitel : 56 ; 565-575
2021-11-02
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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