Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Patent
1998-07-06
2000-02-15
Eldred, J. Woodrow
Aeronautics and astronautics
Aircraft, heavier-than-air
Helicopter or auto-rotating wing sustained, i.e., gyroplanes
244 39, 244 60, 244 1711, 180337, 180338, B64C 1134
Patent
active
060243244
ABSTRACT:
The monitoring method includes the steps of: acquiring a signal from an acceleration sensor associated with an epicyclic assembly; sampling the signal at a predetermined sampling frequency to obtain an initial sequence of samples; dividing the samples in the initial sequence into groups, each defined by a predetermined number of samples; acquiring predetermined groups of samples; filtering the acquired groups of samples to obtain an intermediate sequence of samples; processing the intermediate sequence of samples to obtain a final sequence of samples; calculating a sixth-order moment of the final sequence of samples; and comparing the sixth-order moment with at least one predetermined threshold to detect any vibrational irregularity in the epicyclic assembly of the helicopter.
REFERENCES:
patent: 4479619 (1984-10-01), Saunders et al.
patent: 4783023 (1988-11-01), Jupe
Bellazzi Alberto
Maino Bruno
Eldred J. Woodrow
Finmeccanica S.P.A.
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