Effect of clearances in rolling element bearings on their dynamic performance, quality and operating life

Yakout, Mostafa; Nassef, M. G. A.; Backar, Soheir

doi:10.1007/s12206-019-0406-y

Cited by 37 publications

(17 citation statements)

References 23 publications

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“…In other studies [57][58][59][60], theoretical and experimental studies have been conducted for an assessment of modal properties and frequency response functions applicability for detection of structural bolted joint degradation [61]. Some methods of radial clearance diagnostics by vibration signals are given in [62][63][64][65][66][67][68][69][70][71][72][73]. The effect of rolling bearing clearances on diagnostic signatures is investigated in [65] in the 5-DOF nonlinear dynamic model, which imitates gradual wear of bearings, using an experimental identification method based on FRF decoupling and optimization [66].…”

Section: Diagnostics Of Bearing Supports and Bolts Looseningmentioning

confidence: 99%

“…Some methods of radial clearance diagnostics by vibration signals are given in [ 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 ]. The effect of rolling bearing clearances on diagnostic signatures is investigated in [ 65 ] in the 5-DOF nonlinear dynamic model, which imitates gradual wear of bearings, using an experimental identification method based on FRF decoupling and optimization [ 66 ].…”

Section: Introductionmentioning

confidence: 99%

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Vibration-Based Diagnostics of Radial Clearances and Bolts Loosening in the Bearing Supports of the Heavy-Duty Gearboxes

Krot

Korennoi

Zimroz

2020

Sensors

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The problem solved in this research is the diagnosis of the radial clearances in bearing supports and the loosening of fastening bolts due to their plastic elongation (creep) or weak tightening using vibration signals. This is an important issue for the maintenance of the heavy-duty gearboxes of powerful mining machines and rolling mills working in non-stationary regimes. Based on a comprehensive overview of bolted joint diagnostic methods, a solution to this problem based on a developed nonlinear dynamical model of bearing supports is proposed. Diagnostic rules are developed by comparing the changes of natural frequency and its harmonics, the amplitudes and phases of shaft transient oscillations. Then, the vibration signals are measured on real gearboxes while the torque is increasing in the transmission during several series of industrial trials under changing bearings and bolts conditions. In parallel, dynamical torque is measured and its interrelation with vibration is determined. It is concluded that the radial clearances are the most influencing factors among the failure parameters in heavy-duty gearboxes of industrial machines working under impulsive and step-like loading. The developed diagnostics algorithm allows condition monitoring of bearings and fastening bolts, allowing one to undertake timely maintenance actions to prevent failures.

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Section: Diagnostics Of Bearing Supports and Bolts Looseningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vibration-Based Diagnostics of Radial Clearances and Bolts Loosening in the Bearing Supports of the Heavy-Duty Gearboxes

Krot

Korennoi

Zimroz

2020

Sensors

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“…The effect of the internal radial clearance on the damping characteristics, natural modes of vibration, and fatigue life of rolling element bearings was studied. It was concluded that the experimental results showed that the bearing with the largest radial clearance had the lowest damping ratio, highest natural frequency, and shortest bearing life [9].…”

Section: Introductionmentioning

confidence: 97%

Effects of Design Parameters on Static Equivalent Stress of Radial Rolling Bearings

Bozca

2021

Acta Polytech

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The aim of this study is to theoretically investigate the effects of design parameters on the static equivalent stress of radial rolling bearings, such as the point contact case for ball bearings and line contact case for roller bearings. The contact pressure, contact area and von Misses stress of bearings are calculated based on geometrical parameters, material parameters and loading parameters by using the developed MATLAB program. To achieve this aim, both the maximum contact pressure pmax and Von Mises effective stress σVM are simulated with respect to design parameters such as varying ball and roller element diameters and varying ball and roller element elasticity modulus. For the point contact case and line contact case, it was concluded that increasing the diameter of ball and roller elements results in reducing the maximum contact pressure pmax Furthermore, increasing the elasticity modulus of the ball and roller elements results in increasing the maximum contact pressure σVM. Furthermore, increasing the elasticity modulus of the ball and roller element results in increasing the maximum contact pressure pmax and Von Mises effective stress σVM because of the decrease of contact area A. The determination of the diameter of the ball and roller elements and the selection of material are crucial and play an effective role during the design process. Therefore, bearing designers and manufacturers should make the bearing geometrical dimensions as large as possible and bearing material as elastic as possible. Furthermore, the stress-based static failure theory can also be used instead of the standard static load carrying capacity calculation. Moreover, Von Mises stress theory is also compatible with the finite element method.

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“…In contrast, the ball bearing shows the lowest amplitude under the same operation [26]. Dynamic characters result in dynamic performance as scroll bearing is significantly affected by internal radial distances [27]. The nonlinear correlation between friction and natural vibration and the effect of lubricant specification on nonlinear natural vibrations.…”

Section: Introductionmentioning

confidence: 98%

Dynamic Characterization of Ball Bearing in Turbine Propeller Using Bump Test Method

Pratiwi

Ikhsan

Octavianto

et al. 2021

Sinergi

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Bearing is an essential component in a mechanical rotating equipment system. It is no less important than lubrication to prevent wear is very important to consider in the mechanical maintenance system of rotating equipment. Bearing wear is one of the problems in wind turbines that will increase maintenance costs, shorten the wind turbines' lifespan, and cause the component or overall damage to the wind turbine. The latest technology has provided instruments for analyzing the damage of elements in a bearing according to the caused vibrations. Therefore, this study was performed on Ball Bearing Turbine Propeller to identify the dynamic characteristics of Ball Bearing with and without lubrication. The test was carried out using the Bump Test method applied in three measured parts: X, Y, and Z axes. The measuring instrument which was used was Fast Fourier Transform (FFT) Analyzer (Ono Sokki) and the data were analyzed using MATLAB. It was identified that the application of oil could reduce the amplitude and decrease the frequency. Personal frequency appearing more than once indicates the existence of global vibration modes. The frequency which only appears once in the measurement spot indicates local vibration modes. The highest frequency both after and before the application of oil was found in the Y-axis.

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Effect of clearances in rolling element bearings on their dynamic performance, quality and operating life

Cited by 37 publications

References 23 publications

Vibration-Based Diagnostics of Radial Clearances and Bolts Loosening in the Bearing Supports of the Heavy-Duty Gearboxes

Vibration-Based Diagnostics of Radial Clearances and Bolts Loosening in the Bearing Supports of the Heavy-Duty Gearboxes

Effects of Design Parameters on Static Equivalent Stress of Radial Rolling Bearings

Dynamic Characterization of Ball Bearing in Turbine Propeller Using Bump Test Method

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