Method of monitoring a transmission assembly of a vehicle equipped with acceleration sensors, in particular a helicopter
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United States of America Patent
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Jan 25, 2000
Grant Date -
N/A
app pub date -
Jul 6, 1998
filing date -
Jul 4, 1997
priority date (Note) -
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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.
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