Method of monitoring an epicyclic gear assembly equipped with acceleration sensors in a vehicle, in particular a helicopter

摘要

The monitoring method includes the steps of: acquiring a signal (s(t)) from an acceleration sensor associated with an epicyclic assembly; sampling the signal (s(t)) at a predetermined sampling frequency (FS) to obtain an initial sequence of samples (T1(i)); dividing the samples (T1(i)) in the initial sequence into groups, each defined by a predetermined number (NJ) of samples; acquiring predetermined groups of samples; filtering the acquired groups of samples to obtain an intermediate sequence of samples (Tf(i)); processing the intermediate sequence of samples (Tf(i)) to obtain a final sequence of samples (ETJ,K(i)); calculating a sixth-order moment (M6A) of the final sequence of samples (ETJ,K(i)); and comparing the sixth-order moment (M6A) with at least one predetermined threshold (TH1) to detect any vibrational irregularity in the epicyclic assembly of the helicopter. <IMAGE>