Steps toward prognostics of faults in bearings

Eyal Madar, Dmitri Gazizulin, Jacob Bortman, Renata Klein

Research output: Contribution to conferencePaperpeer-review


Assessment of the remaining useful life of a rolling-element bearing is a key element in rotating machines prognostics. Evaluation of the bearing remaining useful life (RUL) requires diagnosis of the fault existence, estimation of its size and estimation of the time interval until it reaches a critical size. A concept for bearing RUL estimation is proposed. The main insights which led to the concept development are reviewed. The study focuses on estimation of spall size located in one of the bearing races. A new approach for estimation of spall size in bearing races is developed based on physical insights obtained from results of a general bearing dynamic model. Analytical modeling of the interaction between the spall and the rolling element enables the development of an autonomous generic method for spall size estimation. In this paper, the principles for spall size estimation are described. The new method was applied to experimental data including different spall sizes on inner and outer races. The estimation shows satisfactory results with errors up to 20%.

Original languageAmerican English
Number of pages9
StatePublished - 1 Jan 2018
Event58th Israel Annual Conference on Aerospace Sciences, IACAS 2018 - Tel-Aviv and Haifa, Israel
Duration: 14 Mar 201815 Mar 2018


Conference58th Israel Annual Conference on Aerospace Sciences, IACAS 2018
CityTel-Aviv and Haifa

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science


Dive into the research topics of 'Steps toward prognostics of faults in bearings'. Together they form a unique fingerprint.

Cite this