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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"Rolling element bearings"”.
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Fault detection of rolling element bearings
… signals from both the artificially defected bearings and bearings running from normal till failure are performed. It was found that both methods work well for field applications.When the signal to noise ration is low, we can pre-process the signal with harmonic analysis to extract the fault …
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On the Thermally Induced Failure of Rolling Element Bearings
… investigation of thermally induced seizure of rolling element bearings. A comprehensive thermal model of the rolling element bearings is developed which can predict the operating temperature of the bearing components in a wide range of operating conditions. The validity of this thermal model is …
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Anomaly detection in rolling element bearings via two-dimensional Symbolic Aggregate Approximation
… maintaining a high level of robustness to noise. Rolling element bearings are particularly common mechanical components where anomaly detection is of high importance. Harsh operating conditions and manufacturing imperfections increase vibration innately reducing component life and increasing …
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Physics-Informed Diagnostic and Prognostic Models for Rolling Element Bearings Using Oil Debris Data
Rolling element bearings are susceptible to rolling contact fatigue failure. This poses challenges in industrial applications like wind turbines and aircraft. To address this challenge, the thesis constructs diagnostic and prognostic models due to spalling in the inner raceway. This is achieved by …
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The development of a rule based expert system to automate the digital analysis of condition monitoring parameters captured on rolling element bearings subjected to simulated failure
… aspect ofthe system, viz. the analysis of rolling element bearing condition. The bearing test rig and data capture system are described, followed by primary research to define the bearing analysis solution space. This includes the use of vibration parameters, measured and derived operating …
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Surface self-compensated hydrostatic bearings
… technology has several unique advantages over rolling element bearings. The thin fluid film between the bearing pads and the rail provides virtually infinite motion resolution due to lack of static friction, very low straightness ripple, high squeeze film damping, potentially infinite bearing …
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Numerical Analysis of Transient, Line-Contact Problems in Elastohydrodynamic Lubrication
… contacts. Such contacts exist, for example, in rolling-element bearings, gears and cam-follower mechanisms. In EHD lubrication, the contact surfaces are not only separated by a thin lubricating film, but also elastically deformed to an amount comparable to the film thickness. The film thickness …
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Industrial Scalable Rolling Element Bearing Diagnostic and Prognostic Modelling
Rolling element bearings are a critical component in nearly any rotating system. They operate at significant loads and speeds and must withstand various forms of harsh environmental factors. Due to this, they can be prone to rolling contact fatigue failure, especially in industrial applications …
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An experimental study of fretting corrosion at a bearing/cartridge interface
… influencing fretting and fretting corrosion in rolling element bearings. The new device is capable of varying load from zero to 200 N (45 lbf), amplitude of vibration from zero to 500 µm (0.0197 in.), and frequency from 2.5 to 100 Hz for axial relative motion. Five sets of bearings and …
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A review of vibration signal processing techniques for use in a real time condition monitoring system
The analysis of the vibrations produced by roller bearings is one of the most widely used techniques in condition determination of rolling element bearings. This project forms part of an overall plan to gain experience in condition monitoring and produce a computer aided vibration monitoring system …
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A vibration analysis of a bearing/cartridge interface for a fretting corrosion study
… parameters influencing fretting corrosion in rolling element bearings. The bearing examined was a 320 size, deep grooved, ABEC 7 ball bearing used in a Navy ship service motor-generator unit. Three axes of acceleration signatures were simultaneously recorded from the outer race and cartridge. …
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Vibration signatures of defective bearings and defect size estimation methods
Rolling element bearings are widely used in rotary machinery, often with extremely demanding performance criteria. The failure of bearings is the most common reason for machine breakdowns. Machine failures can be catastrophic, resulting in costly downtime and sometimes in human casualties. The …
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Multi Scale Contact Mechanics of Bio-Mechanical Systems with inclusion of roughness effect- Fractal Analysis
… that include spur and helical gearing and rolling element bearings.
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Design for low-volume production
… Charts for electrical energy sources and rolling element bearings are described.
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The effects of the slip amplitude and lubricant type on the rate of false brinelling in roller bearings
… is a wear phenomenon that occurs in stationary rolling element bearings. Vibrations from adjacent running machinery are transmitted to the stationary bearing via the machinery foundations, and result in relative motion between the rollers and the races. This results in wear scars at the point of …
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Deep Unsupervised Anomaly Detection Applied to Motor-Driven Blowers
… accuracy across diverse applications such as rolling element bearings, plasma etching machines, and milling machines. To further explore the ability of the algorithm to generalize to new applications, we consider the problem of anomaly detection in belt-driven blower-motor units due to …
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Anomaly Detection in Heterogeneous Data Environments with Applications to Mechanical Engineering Signals & Systems
… algorithms, as well as experimental data from rolling element bearings, with highly accurate detection rates (>99% detection, <1% false alarm). Significant developments were shown in parameter-driven data by reducing the sample sizes necessary for analysis, as well as reducing the time required …
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Numerical Simulation of Contacts Working Under Mixed Lubricating Conditions
… various machine components, for instance, gears, rolling element bearings, journal bearings, cam and follower mechanisms, piston ring lubrication etc. This is the crucial lubrication state where the transition occurs from BL to HL. In BL the external forces (load) are entirely supported by the …
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Ranking of Fatigue Data Based upon Monte Carlo Simulated Confidence Number Figures
Since fatigue is probabilistic, trends observed in large populations of data are necessary to select materials, compare engineering designs, or establish preventative maintenance schedules. The generation of large experimental fatigue populations, however, is prohibitively time consuming and …