Thermal Interactions In Rolling Bearing Dynamics

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Thermal Interactions In Rolling Bearing Dynamics

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Author :
language : en
Publisher:
Release Date : 2002

Thermal Interactions In Rolling Bearing Dynamics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.

Numerical enhancements to the established bearing dynamics computer code, Advanced Dynamics of Rolling Elements (ADORE), have been accomplished for improved computation of bearing heat generation and geometrical variation in bearing element dimensions. Thermal interaction modules have been added to analyze the computed heat generation considering conduction through the element and convection to the circulating fluid or lubricant. Averaging procedures have been implemented to determine the bulk temperatures of the various bearing elements. Well-established methods have been used to compute the associated changes in bearing geometry, which then affect mechanical interaction in the bearing.

Advanced Dynamics Of Rolling Elements

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Author : P.K. Gupta
language : en
Publisher: Springer
Release Date : 1984-10-31

Advanced Dynamics Of Rolling Elements written by P.K. Gupta and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984-10-31 with Science categories.

In any rotating machinery system, the bearing has traditionally been a crit ical member of the entire system, since it is the component that permits the relative motion between the stationary and moving parts. Depending on the application, a number of different bearing types have been used, such as oil-lubricated hydrodynamic bearings, gas bearings, magnetic suspensions, rolling element bearings, etc. Hydrodynamic bearings can provide any desired load support, but they are limited in stiffness and the associated power loss may be quite large. Gas bearings are used for high-precision applications where the supported loads are relatively light, bearing power losses are very low, and the rotating speeds generally high. For super precision components where no frictional dissipation or bearing power loss can be tolerated, magnetic suspensions are employed; again, the load support requirements are very low. Rolling element bearings have been widely used for those applications that require greater bearing versatility, due to the requirements for high-load and high-stiffness characteristics, while allowing moderate power loss and permitting variable speeds. A study of the dynamic interaction of rolling elements is, therefore, the subject of this text. Texts covering the analysis and design methodology of rolling elements are very limited. Notable works include Analysis of Stresses and Deflections (Jones, 1946, Vols. I and II), Ball and Roller Bearings, Their Theory, Design and Application (Eschmann, Hasbargen, and Weigand, 1958), Ball and Roller Bearing Engineering (Palmgren, 1959, 3rd ed. ), Advanced Bearing Technology (Bisson and Anderson, 1965), and Rolling Bearing Analysis (Harris, 1966).

Real Time Modeling Of Thermal Interactions In Cryogenic Ball Bearings

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Author : P. K. Gupta
language : en
Publisher:
Release Date : 2019

Real Time Modeling Of Thermal Interactions In Cryogenic Ball Bearings written by P. K. Gupta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.

Modelling The Dynamic Interactions Of Rolling Bearings

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Author : João Henrique Diniz Guimarães
language : en
Publisher:
Release Date : 2008

Modelling The Dynamic Interactions Of Rolling Bearings written by João Henrique Diniz Guimarães and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.

Roller bearings are wide spread machine elements. This work deals with the generation and propagation of structure-borne sound by the rolling movement in bearings. A physical model of the excitation mechanism in bearings in dependence of the condition of the surfaces and the dynamics of the rolling movement is presented. It allows the simulation of the time evolution of the excitation generated by the bearing that will propagate to the surrounding structure. Additionally, an experimental evaluation of the influence of the signal path between the point where the excitation is generated (in the bearing) to the point where it is usually measured (on the machine's housing) is also made using special self-made sensors and actuators. This alternative approach gives a deeper insight in the understanding of machine vibrations, describing the vibration source and the transfer path as part of a signal chain. This allows, among other things, the assessment of bearing conditions in operation and the optimization of the design of these elements.

Advanced Dynamics Of Rolling Elements

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Author : P.K. Gupta
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

Advanced Dynamics Of Rolling Elements written by P.K. Gupta and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.

In any rotating machinery system, the bearing has traditionally been a crit ical member of the entire system, since it is the component that permits the relative motion between the stationary and moving parts. Depending on the application, a number of different bearing types have been used, such as oil-lubricated hydrodynamic bearings, gas bearings, magnetic suspensions, rolling element bearings, etc. Hydrodynamic bearings can provide any desired load support, but they are limited in stiffness and the associated power loss may be quite large. Gas bearings are used for high-precision applications where the supported loads are relatively light, bearing power losses are very low, and the rotating speeds generally high. For super precision components where no frictional dissipation or bearing power loss can be tolerated, magnetic suspensions are employed; again, the load support requirements are very low. Rolling element bearings have been widely used for those applications that require greater bearing versatility, due to the requirements for high-load and high-stiffness characteristics, while allowing moderate power loss and permitting variable speeds. A study of the dynamic interaction of rolling elements is, therefore, the subject of this text. Texts covering the analysis and design methodology of rolling elements are very limited. Notable works include Analysis of Stresses and Deflections (Jones, 1946, Vols. I and II), Ball and Roller Bearings, Their Theory, Design and Application (Eschmann, Hasbargen, and Weigand, 1958), Ball and Roller Bearing Engineering (Palmgren, 1959, 3rd ed. ), Advanced Bearing Technology (Bisson and Anderson, 1965), and Rolling Bearing Analysis (Harris, 1966).

Computational Design Of Rolling Bearings

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Author : Hung Nguyen-Schäfer
language : en
Publisher: Springer
Release Date : 2016-04-10

Computational Design Of Rolling Bearings written by Hung Nguyen-Schäfer and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04-10 with Technology & Engineering categories.

This book comprehensively presents the computational design of rolling bearings dealing with many interdisciplinary difficult working fields. They encompass elastohydrodynamics (EHD), Hertzian contact theory, oil-film thickness in elastohydrodynamic lubrication (EHL), bearing dynamics, tribology of surface textures, fatigue failure mechanisms, fatigue lifetimes of rolling bearings and lubricating greases, Weibull distribution, rotor balancing, and airborne noises (NVH) in the rolling bearings. Furthermore, the readers are provided with hands-on essential formulas based on the up-to-date DIN ISO norms and helpful examples for computational design of rolling bearings. The topics are intended for undergraduate and graduate students in mechanical and material engineering, research scientists, and practicing engineers who want to understand the interactions between these working fields and to know how to design the rolling bearings for automotive industry and many other industries.

On The Dynamic Thermal And Thermoelastic Contact Interaction Between A Rotor And An Auxiliary Bearing

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Author : Woon Yik Yong
language : en
Publisher:
Release Date : 2006

On The Dynamic Thermal And Thermoelastic Contact Interaction Between A Rotor And An Auxiliary Bearing written by Woon Yik Yong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.

Bearings

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Author : Maurice L. Adams
language : en
Publisher: CRC Press
Release Date : 2018-04-19

Bearings written by Maurice L. Adams and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-04-19 with Technology & Engineering categories.

Bearings: from Technoloogical Foundations to Practical Design Applications provides a modern study of bearing types, design factors, and industrial examples. The major classes of bearings are described, and design concepts are covered for rolling elements, surfaces, pivots, flexures, and compliance surfaces. Fluid film lubrication is presented, and the basics of tribology for bearings is explained. The book also looks at specific applications of bearing technology, including bearings in vehicles, rotating machinery, machine tools, and home appliances. Case studies are also included.

Thermal Effects In Tribology

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Author : D. Dowson
language : en
Publisher: Professional Engineering Publishing
Release Date : 1980

Thermal Effects In Tribology written by D. Dowson and has been published by Professional Engineering Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Technology & Engineering categories.

Oil Droplet Impact Dynamics In Aero Engine Bearing Chambers Correlations Derived From Direct Numerical Simulations

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Author : Davide Peduto
language : en
Publisher: Logos Verlag Berlin GmbH
Release Date : 2015-06-30

Oil Droplet Impact Dynamics In Aero Engine Bearing Chambers Correlations Derived From Direct Numerical Simulations written by Davide Peduto and has been published by Logos Verlag Berlin GmbH this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-06-30 with Science categories.

Bearing Chambers in Aero-Engines are located near the rolling-element type of bearings which support the shafts and accomodate the resulting thrust loads. One of the main task of the bearing chambers is, beside an efficient scavenging of the lubricating oil, the cooling of the hot compartments. A very complex two-phase air-oil flow takes usually place in these bearing chambers consisting of oil droplet-laden air flows and shear-driven liquid wall films. The interaction of the droplets with the wall films is significantly influencing the wall heat transfer and the cooling performance of these systems. For this reason, a detailed characterization and modelling of the mass and momentum exchange between droplets and wall films for the unique impingement parameter range in bearing chambers is inevitable. This scientific report investigates the oil droplet impact dynamics for typical impingement regimes relevant to aero-engine bearing chambers. The application of a Direct Numerical Simulation (DNS) technique based on the Volume-of-Fluid (VOF) method and coupled with a gradient-based adaptive mesh refinement (AMR) technique allowed to characterize the drop impact dynamics during various single micro- and millimeter drop impacts onto thin and thick films. With the help of a special numerical treatment, a self-perturbing mechanism is installed that leads to the correct resolution of the crown disintegration process. The numerical methodology was thoroughly validated using the experimental results of millimeter sized drop impacts onto deep liquid pools. These results were developed with an enhanced back-illuminated high-speed imaging and Particle Tracking Velocimetry (PTV) technique. New insights into the cavity penetration, the crown's breakup dynamics and the secondary droplet characteristics following a single drop impact have been developed with the help of the isolated variation of different parameters of influence. Particularly the influence of the Froude number, the impingement angle, and the cavity-wall interaction delivered results to date not reported in scientific literature. Beside the advances in fundamental physics describing the drop impact dynamics with the help of the numerical and experimental results, a set of correlations could also be derived. From these correlations, a drop-film interaction model was formulated that is suitable for the parameter range found in bearing chambers.