Synthesized synchronous sampling and acceleration enveloping for differential bearing damage signature
AssigneeGeneral Electric Company
InventorsHuageng Luo, George Hanna Ghanime, Hai Qiu
Life of this patent
Estimating the term…
Abstract
A system for detecting differential bearing damages includes a synthesized tachometer that generates a tachometer signal corresponding to the race speed difference of a bearing assembly such that the bearing damage speed difference dependency can be eliminated and the damage features can be enhanced. The system also includes acceleration enveloping in the cycle domain to further enhance the damage signatures.
Claims24
A method of detecting differential bearing damages, the method comprising:
- generating a plurality of speed signals for inner and outer rotating bearing races;
- synthesizing a tachometer corresponding to the speed difference of the inner and outer races ;
- and
- synchronously sampling bearing vibration data in response to the synthesized speed difference tachometer signal to generate synthesized cycle domain data corresponding to at least one bearing damage signature.
A method of enhancing a differential bearing damage signature, the method comprising:
- generating a plurality of speed signals for each differential bearing race;
- synthesizing at least one tachometer signal for at least one differential bearing race;
- and
- synchronously sampling vibration data associated with a differential bearing with respect to race speed differences in response to the plurality of speed signals and the at least one synthesized tachomenter signal to generate synthesized cycle domain data corresponding to at least one bearing damage signature.
The method according to claim 11, wherein synthesizing at least one tachometer signal comprises:
- locating a tachometer pulse at a first time subsequent to a start time and immediately preceding a missing tachometer pulse;
- assuming the existence of a tachometer pulse at a second time corresponding to the missing tachometer pulse;
- determining an average bearing assembly shaft speed between the first time and the second time;
- and
- minimizing the absolute value of the difference between a deviation in the first time and a deviation in the second time to determine the approximate location of the at least one synthesized tachometer signal.
A system for detecting bearing damage, the system comprising:
- a synthesized tachometer configured to generate a speed signal for a bearing assembly such that the speed signal corresponds to the approximate location of a missing tachometer signal based on race speeds of the bearing assembly;
- and
- a sampling mechanism configured to synchronously sample vibration data associated with the bearing assembly based on the speed signal to generate synthesized cycle domain data corresponding to at least one bearing assembly damage signature.
Dependencies are inferred from the claim text.