A defect size estimation method based on operational speed and path of rolling elements in defective bearings

This paper describes the effect of inertia and centrifugal force that act on a rotating rolling element in a defective bearing, on the measured vibration signature. These effects are more pronounced as the speed of components increases. Significant speed-dependency of the characteristic events that are generated at the angular extents of the defect are shown by simulation and experimental measurements. The sources of inaccuracy and the speed dependency in the existing defect size estimation algorithms are explained. The analyses presented in this study are essential to develop accurate and reliable defect size estimation algorithms. A complete defect size estimation algorithm is proposed that is more accurate and less biased by shaft speed when compared with existing methods. (C) 2016 Elsevier Ltd. All rights reserved.