Experimental Vibration Studies of Deep Groove Ball Bearings Having Damaged Surfaces

In deep groove ball bearings contamination of lubricant grease by solid particles is one of the main reason for early bearing failure. To deal with such problem, it is fundamental not only the use of reliable techniques concerning detection of solid contamination but also the investigation of the effects of certain contaminant characteristics on bearing performance. Nowadays the techniques such as vibration measurements are being increasingly used for on-time monitoring of machinery performance. The present work investigates the effect of lubricant contamination by solid particles on the dynamic behavior of rolling bearings, in order to determine the trends in the amounts of vibration affected by contamination in the Grease and by the bearing wear itself. Experimental tests are performed with Deep-groove ball bearings. The Dolomite powder in three concentration levels and different particle sizes was used to contaminate the grease. Vibration signals were analyzed in terms of Root Mean Square (RMS) values and also in terms of defect frequencies.

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Deep Groove Ball Bearings

Encyclopedia of Lubricants and Lubrication ◽

10.1007/978-3-642-22647-2_200109 ◽

2014 ◽

pp. 363-363

Keyword(s):

Ball Bearings ◽

Deep Groove

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Study on the Dynamic Problems of Double-Disk Rotor System Supported by Deep Groove Ball Bearing

Shock and Vibration ◽

10.1155/2019/8120569 ◽

2019 ◽

Vol 2019 ◽

pp. 1-12 ◽

Cited By ~ 1

Author(s):

Yang Liu ◽

Jiyuan Han ◽

Siyao Zhao ◽

Qingyu Meng ◽

Tuo Shi ◽

...

Keyword(s):

Ball Bearing ◽

Structural Characteristics ◽

Great Influence ◽

Vibration Characteristics ◽

Rotor System ◽

Ball Bearings ◽

Bearing Clearance ◽

Deep Groove ◽

Deep Groove Ball Bearing ◽

System Nodes

Aiming at the analysis of the dynamic characteristics of the rotor system supported by deep groove ball bearings, the dynamic model of the double-disk rotor system supported by deep groove ball bearings was established. In this paper, the nonlinear finite element method is used combined with the structural characteristics of deep groove ball bearings. Based on the nonlinear Hertz contact theory, the mechanical model of deep groove ball bearings is obtained. The excitation response results of the rotor system nodes are solved by using the Newmark-β numerical solution method combined with the Newton–Raphson iterative method. The vibration characteristics of the rotor system supported by deep groove ball bearings are studied deeply. In addition, the effect of varying compliance vibration (VC vibration) caused by the change in bearing support stiffness on the dynamics of the system is considered. The time domain and frequency domain characteristics of the rotor system at different speeds, as well as the influence of bearing clearance and bearing inner ring’s acceleration on the dynamics of the rotor system are analyzed. The research shows that the VC vibration of the bearing has a great influence on the motion of the rotor system when the rotational speed is low. Moreover, reasonable control of bearing clearance can reduce the mutual impact between the bearing rolling element and the inner or outer rings of the bearing and reduce the influence of unstable bearing motion on the vibration characteristics of the rotor system. The results can provide theoretical basis for the subsequent study of the nonlinear vibration characteristics of the deep groove ball bearing rotor system.

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Wear-life analysis of deep groove ball bearings based on Archard wear theory

Journal of Mechanical Science and Technology ◽

10.1007/s12206-018-0635-5 ◽

2018 ◽

Vol 32 (7) ◽

pp. 3329-3336 ◽

Cited By ~ 5

Author(s):

Guangwei Yu ◽

Wei Xia ◽

Zhuoyuan Song ◽

Rui Wu ◽

Siling Wang ◽

...

Keyword(s):

Ball Bearings ◽

Wear Life ◽

Deep Groove ◽

Life Analysis

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Vibration Analysis of Deep Groove Ball Bearings With Local Defect Using a New Displacement Excitation Function

Journal of Tribology ◽

10.1115/1.4048163 ◽

2020 ◽

Vol 142 (12) ◽

Author(s):

Chengcheng Li ◽

Yi Qin ◽

Yi Wang ◽

Haizhou Chen

Keyword(s):

Excitation Function ◽

Mechanical Equipment ◽

Local Defect ◽

Ball Bearings ◽

Defect Zone ◽

Proposed Model ◽

Deep Groove ◽

Impulse Function ◽

Rolling Elements ◽

Vibration Signal Analysis

Abstract Bearings are vital parts of many mechanical equipment, the vibration signal analysis of bearings with local defects is important in guiding the fault diagnosis. In this paper, a dynamic analysis method is proposed to investigate the vibration response of the deep groove ball bearings (DGBBs) with local defect using a new displacement excitation function based on the Hertz contact theory and Newton's second law. The DGBB is modeled as a two degrees-of-freedom system, and an additional friction force in the defect zone, the influence of centrifugal force, the gravity of rolling elements, and lubrication traction/slip force between rolling elements and raceway are considered. And this model is used to study the dynamic signals of DGBB under different fault sizes and rotation speeds. Results indicate that the simulation signal has many continuous impacts and change over the time which is closer to the actual situation compared with the one-shot impulse function such as rectangular or half-sine or piecewise function when the rolling elements passed through the defect zone. Finally, the validity of the proposed model is verified by experiments. The simulated and experimental results indicate that the proposed model would achieve a more appropriate and accurate dynamic simulation.

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Running Torque of Ball Bearings With Polymer Lubricant (Running Torque Formulas of Deep Groove Ball Bearings Under Axial Loads)

Journal of Tribology ◽

10.1115/1.2959119 ◽

2008 ◽

Vol 130 (4) ◽

Cited By ~ 7

Author(s):

Masayuki Kanatsu ◽

Hiroyuki Ohta

Keyword(s):

Rolling Resistance ◽

Mineral Oil ◽

Type I ◽

Ball Bearings ◽

Type Ii ◽

Shearing Resistance ◽

Deep Groove ◽

Axially Loaded ◽

Bearing Rings ◽

Running Torque

A running torque analysis was performed on axially loaded deep groove ball bearings lubricated with a polymer lubricant. The analysis included a Type I and a Type II bearing. The Type I bearing has a stamped steel riveted cage with its cavity packed with the polymer lubricant. The ball surface, except for the contact points of the ball and the raceways, was covered with the polymer lubricant. The Type II bearing had the polymer lubricant packed only on the riveted parts of the cage; the balls were not covered with the polymer lubricant. The analysis was applied to a 6206 deep groove ball bearing axially loaded in a range typical of preloads applied in actual application to this size bearing to establish bearing tare torque. The results were compared to an available database. The running torque formulas for deep groove ball bearings with polymer lubricant under axial load were proposed as the sums of the running torque caused by the shearing resistance of the mineral oil between the bearing rings and the polymer lubricant, the elastic hysteresis, the differential slip, the spinning friction of the balls, the elastohydrodynamic lubrication (EHL) viscous rolling resistance, and the friction between the balls and the polymer lubricant (or the cage). The effects of the sources of the running torque were investigated. In the case of the Type I bearing, the running torque caused by the friction between the balls and the polymer lubricant, the EHL viscous rolling resistance, and the shearing resistance of the mineral oil between the bearing rings and the polymer lubricant significantly affect the running torque. In the case of the Type II Bearing, the running torque caused by the EHL viscous rolling resistance and the shearing resistance of the mineral oil between the bearing rings and the polymer lubricant significantly affect the running torque. A reasonable correlation exists between the analysis and the database. However, the analysis needs to be further validated with bearing data from different size deep groove ball bearings run under varying loads and speeds.

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