Method for reducing aircraft cabin noise and vibration

Details Method for reducing aircraft cabin noise and vibration Method for reducing aircraft cabin noise and vibration

1990-12-21

1992-09-15

Black, Thomas G.

Boots, shoes, and leggings

36442401, 244 1N, 416 34, H04R 2700, B64C 1150

Patent

active

051484021

ABSTRACT:
The rotation of N-bladed propellers of a multi-engine aircraft is controlled by phase angle synchronizer 30 such that a predetermined phase angle offset .phi.3 is maintained between the blades of a first propeller 10 and the blades of a second propeller 20, at which offset cabin noise is reduced to a minimum and cabin vibration to a near minimum. The controller 40 determines the optimum phase angle offset .phi.3 to be that phase angle of the set of N periodic phase angles: .phi.1+K(360/N), where K ranges in integer steps from 0 to N-1, each characteristic of minimum cabin noise generation, beginning with the minimum first phase angle, .phi.1, lying between 0 and 360/N degrees, which is closest to the second phase angle, .phi.2, characteristic of minimum cabin vibration.

REFERENCES:
patent: 4669058 (1987-05-01), Schneider et al.
patent: 4947356 (1990-08-01), Elliott et al.
patent: 5027277 (1991-06-01), Schneider
patent: 5093791 (1992-03-01), Schneider et al.

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