Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Patent
1998-07-06
2000-02-01
Eldred, J. Woodrow
Aeronautics and astronautics
Aircraft, heavier-than-air
Helicopter or auto-rotating wing sustained, i.e., gyroplanes
244 60, 180337, 180338, B64C 1134
Patent
active
060193107
ABSTRACT:
The method includes the steps of: acquiring a signal from an acceleration sensor; calculating the Fourier transform in the frequency domain of the signal to obtain a sequence of samples; acquiring from the sequence of samples a set of samples including samples at the meshing frequency of the gears monitored by the sensor, and samples at the harmonic frequencies of the meshing frequency; calculating the energies associated with the set of samples and the signal; calculating a noise energy parameter correlated to the ratio between the energy of the set of samples and the energy of the signal; comparing the noise energy parameter with at least one predetermined threshold; and generating an alarm signal in the event the noise energy parameter exceeds the threshold value.
REFERENCES:
patent: 3699806 (1972-10-01), Weichbrodt
patent: 4632337 (1986-12-01), Moore
patent: 5210704 (1993-05-01), Husseiny
patent: 5365787 (1994-11-01), Hernandez et al.
Bellazzi Alberto
Maino Bruno
Eldred J. Woodrow
Finmeccanica S.P.A.
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