Active control of propeller-induced noise fields inside a flexible cylinder
作者： Harold C. Lester , Chris R. Fuller
DOI: 10.2514/3.25228
关键词: Aircraft noise 、 Noise 、 Propeller 、 Noise reduction 、 Active noise control 、 Noise control 、 Fuselage 、 Acoustics 、 Propulsor 、 Engineering
摘要: An active noise control model has been evaluated for reducing aircraft interior noise. The structural transmission properties of an fuselage were modelled as a flexible cylinder excited by external acoustic dipoles simulating the produced twin propellers. amplitudes internal distribution monopole sources determined such that area-weighted mean square pressure was minimized in propeller plane. at low frequencies corresponding to blade passage frequency and first few harmonics typical turbo-prop aircraft. Interior reductions 20 25 dB achieved, over substantial region cylindrical cross-section, with just sources. most favorable achieved when used combination source phasing.
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