Method of monitoring a transmission assembly of a vehicle equipp

Details Method of monitoring a transmission assembly of a vehicle equipp Method of monitoring a transmission assembly of a vehicle equipp

1998-07-06

2000-01-25

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

060169931

ABSTRACT:
The method includes the steps of: acquiring a signal from an acceleration sensor; calculating the Hilbert transform of the signal filtered and sampled beforehand; defining a complex signal having the filtered and sampled signal as the real part and the Hilbert transform of the filtered and sampled signal as the imaginary part; calculating a phase signal given by the difference between the phase of the complex signal and a reference phase; calculating the variance of the phase signal; comparing the variance with at least one predetermined threshold; and generating an alarm signal if the variance exceeds the threshold value.

REFERENCES:
patent: 3699806 (1972-10-01), Weichbrodt
patent: 4654836 (1987-03-01), Wason
patent: 5210704 (1993-05-01), Husseiny
patent: 5344101 (1994-09-01), Francois
patent: 5365787 (1994-11-01), Hernandez et al.

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