Ball bearing ≈ Ball bearing
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SVD principle analysis and fault diagnosis for bearings based on the correlation coefficient Open
Aiming at solving the existing sharp problems by using singular value decomposition (SVD) in the fault diagnosis of rolling bearings, such as the determination of the delay step k for creating the Hankel matrix and selection of effective s…
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An Improved VMD With Empirical Mode Decomposition and Its Application in Incipient Fault Detection of Rolling Bearing Open
Transient impulse analysis is an effective way to detect the bearing fault at its early stage. However, it is hard to precisely extract these so-called transient impulses because these collected vibration signals usually are non-stationary…
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Rotor Speed-Based Bearing Fault Diagnosis (RSB-BFD) Under Variable Speed and Constant Load Open
This paper addresses the application of rotor speed signal for the detection and diagnosis of ball bearing faults in rotating electrical machines. Many existing techniques for bearing fault diagnosis (BFD) rely on vibration signals or curr…
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A study of grease lubricants under wind turbine pitch bearing conditions Open
Pitch bearings in wind turbines are affected by reciprocating motion due to pitch control. The combination of oscillating operation, high loads, and mixed lubrication often leads to wear. Grease lubricants in wind turbine pitch bearings sh…
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Fault Severity Classification and Size Estimation for Ball Bearings Based on Vibration Mechanism Open
Severity identification and size estimation is a crucial part of the quantitative diagnosis for ball bearing faults. In this paper, novel fault severity classification rules and the size estimation model based on vibration mechanism for ba…
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Dynamic, thermal, and vibrational analysis of ball bearings with over-skidding behavior Open
The term “over-skidding” indicates that the cage rotational speed ratio exceeds the theoretical value as ball purely rolls on the raceway. Different from the skidding phenomenon that occurs in low-load and high-speed bearing, over-skidding…
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Studies of Friction in Grease-Lubricated Rolling Bearings Using Ball-on-Disc and Full Bearing Tests Open
This article evaluates the frictional performance of different bearing grease formulations in full rolling bearings and a ball-on-disc rig and subsequently assesses whether the ball-on-disc test results can be used to predict the grease pe…
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Investigations for vibration and friction torque behaviors of thrust ball bearing with self-driven textured guiding surface Open
In order to improve the starved lubrication condition of rolling bearings, three kinds of textures, namely dimple, groove texture, and gradient groove texture, were developed on the guiding surface of thrust ball bearings in this study. Th…
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Multi-feature entropy distance approach with vibration and acoustic emission signals for process feature recognition of rolling element bearing faults Open
To accurately reveal rolling bearing operating status, multi-feature entropy distance method was proposed for the process character analysis and diagnosis of rolling bearing faults by the integration of four information entropies in time d…
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Early Detection and Identification of Fatigue Damage in Thrust Ball Bearings by an Acoustic Emission Technique Open
As rolling bearings are widely used in various machines, there is a strong need to detect any problems as early as possible. Although vibration analysis is commonly used in the diagnosis of rolling bearings, it is possible that the failure…
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Dynamic analysis of centrifugal machines rotors supported on ball bearings by combined application of 3D and beam finite element models Open
This research paper is aimed to investigating rotor dynamics of multistage centrifugal machines with ball bearings by using the computer programs "Critical frequencies of the rotor" and "Forced oscillations of the rotor," which are impleme…
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An exploration of frictional and vibrational behaviors of textured deep groove ball bearing in the vicinity of requisite minimum load Open
In case of lightly loaded radial ball bearings, failure mechanisms other than fatigue such as smearing of raceways due to increased frictional torque and vibrations often prevail. Hence, attempts have been made herein for reducing the fric…
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Influences of preload on the friction and wear properties of high-speed instrument angular contact ball bearings Open
For starved-oil or solid lubrication of high-speed instrument angular contact ball bearings, friction heating and wear are the main reasons of bearing failures. This paper presents a dynamic wear simulation model to investigate the impacts…
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Validation of a finite-element model of a wind turbine blade bearing Open
Finite-element analysis is the only means to determine the load situation of slewing bearings with complex interfaces. For reliable results, the finite-element model needs to be validated by comparing the simulation results against measure…
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Influence of the cage on the migration and distribution of lubricating oil inside a ball bearing Open
The migration and distribution of lubricant oil in a rolling bearing strongly affect the elastohydrodynamic lubrication performance between the balls and rings. However, oil re-lubrication is highly dependent on the bearing design, which i…
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Starved lubrication analysis of angular contact ball bearing based on a multi-degree-of-freedom tribo-dynamic model Open
When the oil supply is not adequate to maintain the ideal lubrication, angular contact ball bearing will enter into the starved lubrication regime resulting in the potential performance degradation and consequently the severe failures. To …
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Mechanism and Method for Outer Raceway Defect Localization of Ball Bearings Open
The localization of outer raceway defect plays a significant role in malfunction elimination, failure cause analysis as well as the residual life prediction of ball bearings. Based on the nonlinear dynamic model for a ball bearing and the …
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Investigation on the oil transfer behaviors and the air-oil interfacial flow patterns in a ball bearing under different capillary conditions Open
Lubricant oil is crucial to the rolling bearings as the main medium of lubricating, cooling, cleaning, and so on. The oil starvation in and around the contacts is harmful to the performance and fatigue life of rolling bearings. Therefore, …
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A Vibration Model of Ball Bearings with a Localized Defect Based on the Hertzian Contact Stress Distribution Open
To study the vibration mechanism of ball bearings with localized defects, a vibration model of a ball bearing based on the Hertzian contact stress distribution is proposed to predict the contact force and vibration response caused by a loc…
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Understanding the lubrication regime phenomenon and its influence on tribological characteristics of additively manufactured 316 Steel under novel lubrication environment Open
The degree of surface separation is generally used to determine the lubrication regimes. The smooth functioning of components are possible by providing the lubrication at intermediate zone, which reduces the wear and prevents severe stress…
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Fatigue Life Analysis of Ball Bearings and a Shaft System Considering the Combined Bearing Preload and Angular Misalignment Open
Bearing preload significantly affects the running performance of a shaft-bearing system including the fatigue life, wear, and stiffness. Due to the mounting error, the bearing rings are often angularly misaligned. The effects of the combin…
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Hertz Contact Stress of Deep Groove Ball Bearing Open
Calculation of hertz contact stress between the deep groove ball bearing and inner race using analytical and MESYS tool analysis. The calculation procedure consists of calculation of maximum contact pressure at different loads using analyt…
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A parametric study of an unbalanced Jeffcott rotor supported by a rolling-element bearing Open
Rolling-element bearings are widely used in industrial rotating machines, and hence there is a strong need to accurately predict their influence on the response of such systems. However, this can be challenging due to an interaction betwee…
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X-Ray CT Imaging of Grease Behavior in Ball Bearing and Numerical Validation of Multi-Phase Flows Simulation Open
In an effort to further extend bearing life, the authors have attempted to acquire greater knowledge regarding lubricating grease behavior in a bearing. While conducting experiments, some kinds of difficulties commonly arise when attemptin…
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A Computational Fluid Dynamics Simulation of Oil–Air Flow Between the Cage and Inner Race of an Aero-engine Bearing Open
In aero-engines, the shafts are supported on bearings that carry the radial and axial loads. A ball bearing is made up of an inner race, an outer race, and a cage, which contains the balls, these together comprise the bearing elements. The…
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Research of the influence of the 2D and 3D surface roughness parameters of bearing raceways on the vibration level Open
The level of generated vibrations is one of the most important exploitation parameters of rolling bearings. The vibration analysis allows for the evaluation of the technical condition of new and operating bearing assemblies. There are nume…
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Wear in wind turbine pitch bearings—A comparative design study Open
We tested two types of ball bearings with an outer diameter of 750 mm to learn more about the challenges of oscillating motions for pitch bearings. The experimental conditions are derived from aero‐elastic simulations, long‐term wind speed…
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Numerical simulation of ball bearing flow field using the moving particle semi-implicit method Open
The distribution of lubricating oil in the bearing cavity is of great significance to bearing lubrication and cooling. A new idea is provided to further study the ball bearings lubrication, to achieve effective lubrication of bearings. The…
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Multi-Dimensional Mathematical Wear Models of Vibration Generated by Rolling Ball Bearings Made of AISI 52100 Bearing Steel Open
The paper features the development of multi-dimensional mathematical models used for evaluating the impact of selected factors on the vibration generated by 6304ZZ type rolling ball bearings from three manufacturers in the aspect of the we…
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Thermal Dynamic Exploration of Full-Ceramic Ball Bearings under the Self-Lubrication Condition Open
A silicon nitride ceramic bearing has good self-lubricating characteristics. It still has a good operational status under the condition of a lack of oil. However, the temperature distribution of a silicon nitride ceramic bearing during its…