EHD Analysis With Distributed Structural Inertia
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Abstract:
An elastohydrodynamic lubrication model is presented for the coupled problem of a hydrodynamic lubricating fluid in an elastic structure that includes distributed structural inertia. The problem is formulated and the governing equations solved with the finite element method for an illustrative journal bearing subject to dynamic loading. Inertia effects are demonstrated through comparisons with an existing quasi-static model. While it is true that structural inertia can be neglected without significant loss of accuracy for many journal bearing applications, the new model presented does capture effects of distributed structural inertia where such effects are important and exhibits improvements over existing methods with respect to numerical stability.Keywords:
Structural Stability
Fluid bearing
Texture (cosmology)
Fluid bearing
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This paper introduces air bearings. High-speed air bearings offer very specific advantages over other, more conventional bearing technologies. The reason use of air bearing air bearings as it avoid the traditional bearing-related problems of friction, wear, and lubricant handling, and offer distinct advantages in precision positioning and high speed applications. The use of air bearings means tool life can be greatly extended. Air bearings provide extreme radial and axial rotational precision. The factors affecting the performance of the air bearing like friction, wear, stiffness, load capacity. This paper also introduces with the types of air bearing. New air bearing products like flat bearing, air bushing, vacuum preloaded bearings, air bearing slides, radial bearing and its applications in various fields. It also discuss about the advantages and disadvantages of air bearings.
Air bearing
Foil bearing
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This paper carries out the physical analysis and the theoretical calculation for hydrodynamic bearing under different lubrication condition.The effect of the wear on bearing performance is introduced.Through concrete examples,the paper analyzes the reason of bearing damage,which proves that the lubrication state has a direct relationship with abrasion and life.
Abrasion (mechanical)
Fluid bearing
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The key factor of regular running for water lubricating ceramic bearing is to form a certain thickness of the water film.Accroding to the traditional criteria for calulation of bearing,this paper took a series of measures to make the calculation of the water film exceed the allowable load values,which met the requirements of liquid lubrication and provided reference data for future rearch on water lubrication ceramic Bearing.
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The permissible period during which a grease‐lubricated bearing may operate before requiring re‐lubrication depends on the speed of rotation, the bearing type and dimensions, and a certain number of other factors.
Grease
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Condition monitoring of roller element bearings is of considerable interest to many industries since faulty roller element bearings are known to cause the majority of problems in rotating machinery. The class of failure modes in roller bearings that has received the most attention include spalling or localized defect in one or more of the bearing components. This refers to dislodgement of a portion of the contact surface in one or more of the bearing components in the presence of various kinds of stresses like rotor imbalance, speed, bad lubrication, heavy radial and axial loads. Whereas substantial work has been done in the detection of spalls in bearing components, studies show that one of the primary root causes of spalls in a bearing tends to be ineffective lubrication resulting either from lack of lubrication conditions or the presence of contaminants in the lubricant. Leading bearing companies have indicated that incorrect lubrication can account for more than 90% of bearing failures because of which lubrication can be a key influence that can make or break bearing service and life. This emphasizes the need to develop techniques to sense lubrication anomalies as well as provide information needed to act upon them. In other words, monitoring the health and effectiveness of the bearing lubricant should be at the forefront of a condition-monitoring program for bearings. In this paper, we describe experiments, analyses and results obtained for monitoring and detecting anomalies in bearing lubrication for oil-lubricated bearings. More specifically, we consider two kinds of lubrication anomalies: lack of lubrication and contamination of lubrication. Our work involves the use of techniques in sensing and analyses of acoustic emissions from the bearing housing for detection of anomalous lubrication conditions of the above classes. We explore these techniques by conducting controlled experiments where, conditions equivalent to the appropriate fault condition are simulated in a test rig and AE readings are recorded; as a baseline, we also record vibration readings using traditional accelerometers. Our analyses will consist of extracting features from the AE signal that can suitably distinguish between normal and abnormal lubrication conditions. Additional analyses that can potentially be used to understand the degree of severity of the abnormality will also be presented.
Spall
Rolling-element bearing
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Lubrication of bearing pairs is the problem often underestimated. Usually it is discussed in aspect of operational features stability of friction pair. In fact, it fulfils much more functions and it should be considered in wider aspect. In this paper environmental problems of rolling bearings lubrication were discussed. In analyzed environmental aspects of lubrication, the following problems were discussed: interaction of lubricants (also with additives) and rolling bearing elements, influence of a lubricant on surrounding, acting of lubricating medium on bearing elements, interaction of lubricants’ components, ecological and environmental functions of bearing’s sealing. Conducted analysis were illustrated by examples taken from authors’ own investigations and from literature.
Roller bearing
Main bearing
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Abstract Surface texture has been proved to be an effective method to improve lubrication performance in lubrication contact. However, there exists the controversy about the influence of surface texture on lubrication performance of journal bearings. Moreover, the effect of texture position is not fully understood in current literatures. In the present work, a mass conservation Reynolds equation is employed to investigate the lubrication performance of journal bearings. Bearing characteristics such as the maximum pressure, load‐carrying capacity, friction force, friction coefficient are predicted with elliptical grooves. Two types of microgrooves are comprehensively investigated. The transversal groove in the divergent region ( θ g = 210° in the case) almost does not influence the lubrication performance. The grooves in the inlet and maximum pressure region provide a potential possibility to improve the lubrication performance of journal bearings. In the cases, full grooves yield negative influence on lubrication performance. In addition, the influence of groove configuration is also investigated under different operating conditions. The dimensionless performance parameters for the microgroove in the maximum pressure region ( θ g = 120° in the case) are more sensitive to the microgroove configuration.
Fluid bearing
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Texture (cosmology)
Dimensionless quantity
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Hydrostatic equilibrium
Thrust bearing
Fluid bearing
Lift (data mining)
Oil supply
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