Patent ID: 7684951

Claim:
In a method for detecting a pulse-type mechanical effect on a system part, which includes continuously detecting an operating noise present in the system part with a sensor disposed at the system part and converting the operating noise with the sensor into a measurement signal (M), the improvement comprising the following steps: a) determining a magnitude (A(f i ,tj)) of a transform of the measurement signal (M) with prescribed parameters (f i ) of a mathematical transformation rule in time windows (Δt) being temporally sequential in time steps (δt); b) determining a deviation of the magnitude (A(f i ,t j )) from a mean magnitude (Ā(f i ,t)) for each time step (δt) and each of the prescribed parameters (f i ); c) deriving an evaluation function (K(t)) for each time step (δt) from the deviations determined for each of the prescribed parameters ( fi ); d) comparing the evaluation function (K(t)) with a threshold value (K 0 ), and using an overshooting of the threshold value (K 0 ) as an index for a presence of a pulse-type signal component indicating the mechanical effect; and e) determining a mean magnitude (Ā(f i ,t j )) in a sliding fashion as a function of time t from a data record (A(f i ,t)) having M magnitudes A(f i ,t m ) with the aid of a relationship: A ( f i ,t )=( Q α ( f i ,t )+ Q 1−α ( f i ,t ))/2 with Q α and Q 1−α being respective α and (1−α) quantiles of the magnitudes A(f i ,tm) respectively determined in a time segment (T), with t m =t+mδt, and with m being a whole number.