Patent ID: 8620622

Claim:
An apparatus comprising: an input interface configured to receive an input signal associated with at least one stage of an impeller and with two or more frequencies associated with operation of the impeller; a processor configured to identify a specific failure mode in the impeller using the input signal; and an output interface configured to provide an indicator identifying a health of the impeller; wherein the processor is configured to identify the specific failure mode by: determining a family of frequencies related to at least one of the two or more frequencies associated with operation of the impeller, the family of frequencies including a vane pass frequency and its harmonics; decomposing the input signal by performing a transform of the input signal and isolating components of the transformed input signal into selected frequency bands; reconstructing an impeller signal using portions of the decomposed input signal within the selected frequency bands associated with the family of frequencies; comparing the reconstructed impeller signal to a baseline signal; and categorizing the comparison based on failure mode rules including effects that the specific failure mode has on the two or more frequencies associated with operation of the impeller.