The influence of rolling bearing clearances on diagnostic signatures based on a numerical simulation and experimental evaluation
by Ibrahim Rehab; Xiange Tian; Fengshou Gu; Andrew D. Ball
International Journal of Hydromechatronics (IJHM), Vol. 1, No. 1, 2018

Abstract: This paper presents investigations into the influences of bearing clearances on the diagnostic features of monitoring rolling-bearings. A nonlinear dynamic model of a deep groove ball bearing with five degrees of freedom is developed for numerical analysis under increased radial clearances which are due to not only the scenarios of bearing grades but also gradual wear with bearing service lifetime. The model incorporates local defects and clearance increments in order to gain the insight into the bearing dynamics under different fault cases along with clearance changes. Numerical results show that the vibrations at fault characteristic frequencies exhibit clear inconsistency with common understandings for different cases of increased clearances. This study highlights that it has to take into account the clearance effect, especially for the inner race fault, in order to avoid the under-estimate of fault sizes which may be indicated by the feature amplitude reduction.

Online publication date: Fri, 09-Mar-2018

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