Abstract
Estimation of rolling bearing life with damage curve approach The ability to determine the bearing life time is one of the main purposes in maintenance of rotating machineries. Because of reliability, cost and productivity, the bearing life time prognostic is important. In this paper, a stiffness-based prognostic model for bearing systems is discussed. According to presumed model of bearing and fundamental of damage mechanics, damage curve approach is used to relate stiffness of vibratory system and bearing running life. Furthermore, using the relation between acceleration amplitude at natural frequency and stiffness, final relation between acceleration amplitude at natural frequency and running life time according to damage curve approach can be established and the final running time is predicted. Experiments have been performed on self alignment bearing under failures on inner race and outer race to calibrate and to validate the proposed model. The comparison between model-calculated data and experimental results indicates that this model can be used effectively to predict the failure lifetime and the remaining life of a bearing system.
Highlights
Nowadays, rotating machineries are widely used in mechanical equipments and different industries
The studies of prognostic of remaining life of bearing is categorized in two approaches: Direct approach of fracture mechanics [8, 9, 10], and indirect approach which is a statistical analysis of vibration signals [11]
In test 1 and 2, defect is on outer race and in test 3 and 4 the defect is on inner race of the bearing
Summary
Nowadays, rotating machineries are widely used in mechanical equipments and different industries. The ability to determine the bearing life time is one of the main purposes in maintenance and condition monitoring of rotating machineries. If remaining life time of bearing be predicted reliability of bearing will be improved and cost of maintenance will be reduced, so bearing life time prognostics is one of key points of condition monitoring of rotating machineries. The studies of prognostic of remaining life of bearing is categorized in two approaches: Direct approach of fracture mechanics [8, 9, 10], and indirect approach which is a statistical analysis of vibration signals [11]. A stiffness-based prognostics model for a bearing system based on vibration response analysis and POLISH MARITIME RESEARCH, No 3/2011 damage mechanics is developed. The effectiveness of the model has been studied by comparison between estimated life due to model and real running life of experiment, and accuracy of the model is investigated
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