English to French Tech/Engineering Patents predicting the health of a hydraulic machine, non-pumping frequencies

The controller is configured to: trend the amplitudes of the dynamic pressure signals at non-pumping frequencies over time; compare the trended values to a threshold level; and conclude the hydraulic machine is damaged or worn when the trended dynamic pressure amplitudes exceed a prescribed threshold level.

To use this type of analysis for monitoring pump health, the dynamic pressure
amplitudes of undesirable non-pumping frequencies can be trended over time during periods where the pump is operating at the same steady-state condition. One way to do this is to simply sum ail dynamic pressure energy that exists at non-pumping frequencies, and trend this value. Borrowing the term "signal-to-noise ratio" from signal Processing, where the pumping frequencies can be thought of as the signal, and ail other frequencies can be thought of as noise, this summation of dynamic pressure amplitudes at non-pumping frequencies can be referred to as "noise power".