US 11,054,339 B2
Method and apparatus for monitoring a machine bearing on-vehicle
Jianshe Feng, Cincinnati, OH (US); Xinyu Du, Oakland Township, MI (US); Mutasim Salman, Rochester Hills, MI (US); and Kevin A. Cansiani, Detroit, MI (US)
Assigned to GM Global Technology Operations LLC, Detroit, MI (US)
Filed by GM Global Technology Operations LLC, Detroit, MI (US)
Filed on Nov. 13, 2018, as Appl. No. 16/189,084.
Prior Publication US 2020/0149993 A1, May 14, 2020
Int. Cl. G01M 13/045 (2019.01); G01H 1/00 (2006.01)
CPC G01M 13/045 (2013.01) [F16C 2233/00 (2013.01); F16C 2326/02 (2013.01); G01H 1/003 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for monitoring a machine bearing that is disposed on a rotatable member of a vehicle, the method comprising:
monitoring, via an on-vehicle microphone, an acoustic signal and monitoring, via a position sensor, a rotational speed of the rotatable member associated with the machine bearing;
capturing the acoustic signal when the rotational speed of the rotatable member is at a steady-state condition;
executing, via a controller, a time-frequency analysis of the acoustic signal to determine a sound spectrum;
transforming the sound spectrum to a residual spectrum;
extracting a first feature from the residual spectrum, wherein the first feature is within a first frequency band;
extracting a second feature from the residual spectrum, wherein the second feature is within a second frequency band;
determining a state of health associated with the machine bearing based upon the first and second features; and
communicating, via the controller, the state of health of the machine bearing to a second controller.