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SUMMARY:"COMO2#2 - Bearing degradation indicator using characteristic freq
 uencies applied on non-stationary vibration signals"
DTSTART;VALUE=DATE-TIME:20230712T090000Z
DTEND;VALUE=DATE-TIME:20230712T092000Z
DTSTAMP;VALUE=DATE-TIME:20260308T102534Z
UID:indico-contribution-645@events.isae-supaero.fr
DESCRIPTION:Speakers: Marsick Adrien ()\nRolling-element bearings are wear
  components in rotating machinery. Usually\, their condition is monitored 
 with signal-processing tools tailored for vibration-based surveillance. Fr
 om cyclostationary theory\, angle-time analysis\, or sparsity-based approa
 ches\, numerous methods have been developed relying on the properties of i
 ncipient fault signals. The scalar indicators coming from these techniques
  are well-suited for detection and localisation\, but face difficulties in
  prognosis. The main issue is that the released vibration energy may not c
 orrelate with the severity of the fault. There is a need to develop scalar
  indicators dedicated to gravity estimation. Our belief is that the geomet
 ry modification of the fault will induce a change in the kinematics of the
  rolling-element bearing. Far from the ideal perfect-rolling assumption\, 
 the relationship between the races' rotation and that of the fundamental t
 rain is the fruit of complex interactions. What is usually summarized in t
 he contact angle in the traditional fault frequency equations conceals var
 ious effects of axial-radial load ratio\, skidding between the elements\, 
 and imperfect transmission. As the fault extends\, these interactions may 
 change with a direct impact on the fault characteristic frequencies. Berto
 ni and Andre [1] proposed to monitor these characteristic frequencies with
  the BeaFEM method to estimate the most probable contact angle. They showe
 d on an academic test-bench run-to-failure experiment that monitoring the 
 fault frequencies could be a valuable degradation indicator. The validatio
 n was done on stationary conditions with a main focus on instantaneous ang
 ular speed measurements. However\, under non-stationary conditions\, the e
 quivalent contact angle is sensitive to various factors such as loading\, 
 angular acceleration\, or lubrication. An extension of the method is prese
 nted to prove the relevance of the concept on an industrial case with non-
 stationary conditions. The role of apparent contact angle as a scalar acco
 unting for the kinematics is clarified. The effect of load and rotation sp
 eed is assessed and the method adjusted to emphasize only the contribution
  of the fault. The method is applied to industrial vibration signals from 
 a damaged wind turbine operating over a wide spectrum of speed and load co
 nditions. This original approach provides a tailored tool for optimal main
 tenance decisions. [1]https://doi.org/10.1016/j.ymssp.2022.109891\n\nhttps
 ://events.isae.fr/event/22/contributions/645/
LOCATION:Toulouse
URL:https://events.isae.fr/event/22/contributions/645/
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