Download or read book The Evolution of Rolling Bearing Life Models written by T. E. Tallian and published by . This book was released on 2000 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rolling Bearing Life Prediction Theory and Application written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-22 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: A tutorial is presented outlining the evolution, theory, and application of rolling-element bearing life prediction from that of A. Palmgren, 1924; W. Weibull, 1939; G. Lundberg and A. Palmgren, 1947 and 1952; E. Ioannides and T. Harris, 1985; and E. Zaretsky, 1987. Comparisons are made between these life models. The Ioannides-Harris model without a fatigue limit is identical to the Lundberg-Palmgren model. The Weibull model is similar to that of Zaretsky if the exponents are chosen to be identical. Both the load-life and Hertz stress-life relations of Weibull, Lundberg and Palmgren, and Ioannides and Harris reflect a strong dependence on the Weibull slope. The Zaretsky model decouples the dependence of the critical shear stress-life relation from the Weibull slope. This results in a nominal variation of the Hertz stress-life exponent. For 9th- and 8th-power Hertz stress-life exponents for ball and roller bearings, respectively, the Lundberg- Palmgren model best predicts life. However, for 12th- and 10th-power relations reflected by modern bearing steels, the Zaretsky model based on the Weibull equation is superior. Under the range of stresses examined, the use of a fatigue limit would suggest that (for most operating conditions under which a rolling-element bearing will operate) the bearing will not fail from classical rolling-element fatigue. Realistically, this is not the case. The use of a fatigue limit will significantly overpredict life over a range of normal operating Hertz stresses. Since the predicted lives of rolling-element bearings are high, the problem can become one of undersizing a bearing for a particular application. Zaretsky, Erwin V. Glenn Research Center BALL BEARINGS; CRITICAL LOADING; LIFE (DURABILITY); PREDICTION ANALYSIS TECHNIQUES; WEIBULL DENSITY FUNCTIONS; ROLLER BEARINGS; SHEAR STRESS; STEELS; FAILURE; PREDICTIONS

Download or read book Rolling Bearing Life Models and Steel Internal Cleanliness written by J. Beswick and published by . This book was released on 1999 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most widely used steel grade for rolling bearings is based on a steel composition first used almost a hundred years ago, the so-called lC-1.5Cr steel. This steel is used either in a selective surface induction hardened condition or in a through hardened heat treated condition, both yielding exceptional structural and contact fatigue properties. The Lundberg and Palmgren rolling bearing life prediction model, published in 1947, was the first analytical approach to bearing performance prediction, subsequently becoming a widely accepted basis for rolling bearing life calculations. At that time the fatigue life of rolling bearings was dominated by the classical sub-surface initiated failure mode. This mode results from the accumulation of micro-plastic strain at the depth of maximum Hertzian stress and is accelerated by the stress concentrations occurring at the micro internal defects. In common with all fatigue processes, rolling bearing failure is a statistical process: the failures of bearings with high inclusion content tested at high stress levels belong to the well-known family of "Weibull" distributions. Steady improvements in bearing steel cleanliness due, amongst other things, to the introduction of secondary metallurgy steel making techniques, have resulted in a significantly increased rolling bearing life and load carrying capacity. In recognition of this, in 1985 Ioannides and Harris introduced a new fatigue life model for rolling bearings, comprising a more widely applicable approach to the modelling of bearing life based on the relevant failure mode. Subsequently this has been extended to include effects of hardness and of micro-inclusion distributions in state-of-the-art clean bearing steel.

Download or read book Development of a Mathematical Model for Predicting Life of Rolling Bearings written by Y. P. Chiu and published by . This book was released on 1968 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: A description of rolling contact failure modes is given and the variables affecting the life of a rolling contact are identified. A mathematical model of subsurface and surface crack propagation is presented. The life to failure of volume elements in the vicinity of a defect is formulated. A term 'severity' of a micro defect has been defined. The model is characterized by the inclusion of bulk material parameters, defect characteristics and parameters of geometry, stress, lubrication and surface topography. A statistical expression for the life of an entire rolling body is based on the defect life formula. The new model includes current standard bearing life prediction formulas as a special case. To assist in interpretation of the model, the stressed volume in a Hertzian elliptical stress field has been determined from the computed contours of equal reversing shear stress. A stress analysis has been conducted on the stresses near interacting asperities and around a surface defect (furrow). (Author).

Download or read book Ball and Roller Bearing Engineering written by Arvid Palmgren and published by . This book was released on 1959 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Grease Lubrication in Rolling Bearings written by Piet M. Lugt and published by John Wiley & Sons. This book was released on 2013-02-18 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: The definitive book on the science of grease lubrication for roller and needle bearings in industrial and vehicle engineering. Grease Lubrication in Rolling Bearings provides an overview of the existing knowledge on the various aspects of grease lubrication (including lubrication systems) and the state of the art models that exist today. The book reviews the physical and chemical aspects of grease lubrication, primarily directed towards lubrication of rolling bearings. The first part of the book covers grease composition, properties and rheology, including thermal and dynamics properties. Later chapters cover the dynamics of greased bearings, including grease life, bearing life, reliability and testing. The final chapter covers lubrications systems – the systems that deliver grease to the components requiring lubrication. Grease Lubrication in Rolling Bearings: Describes the underlying physical and chemical properties of grease. Discusses the effect of load, speed, temperature, bearing geometry, bearing materials and grease type on bearing wear. Covers both bearing and grease performance, including thermo-mechanical ageing and testing methodologies. It is intended for researchers and engineers in the petro-chemical and bearing industry, industries related to this (e.g. wind turbine industry, automotive industry) and for application engineers. It will also be of interest for teaching in post-graduate courses.

Download or read book Refinement and Evaluation of Rolling Bearing Load life Model written by Y. P. Chiu and published by . This book was released on 1970 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modelling the Dynamic Interactions of Rolling Bearings written by João Henrique Diniz Guimarães and published by . This book was released on 2008 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Advanced Concepts of Bearing Technology written by Tedric A. Harris and published by CRC Press. This book was released on 2006-10-09 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Part of the fifth edition of the classic Rolling Bearing Analysis, this book examines bearing performance and service life for more complex loading, more extreme operating conditions, and higher-speed applications. Several topics are unique to this work, including mathematical relationships for internal load distribution under conditions of high speed, combined radial, axial, and moment loading, as well as the effects of various types of profiling. The authors also delve into the mathematical development of rolling element-raceway lubricant film thickness and contact friction, the stress-life method for calculating bearing fatigue, and the effects of shaft and supporting structure flexure on bearing loading and deflection.

Download or read book A New Stress based Fatigue Life Model for Rolling Bearings written by Wei-Kuei Yu and published by . This book was released on 1999 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Twin Control written by Mikel Armendia and published by Springer. This book was released on 2019-01-05 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book summarizes the results of the European research project “Twin-model based virtual manufacturing for machine tool-process simulation and control” (Twin-Control). The first part reviews the applications of ICTs in machine tools and manufacturing, from a scientific and industrial point of view, and introduces the Twin-Control approach, while Part 2 discusses the development of a digital twin of machine tools. The third part addresses the monitoring and data management infrastructure of machines and manufacturing processes and numerous applications of energy monitoring. Part 4 then highlights various features developed in the project by combining the developments covered in Parts 3 and 4 to control the manufacturing processes applying the so-called CPSs. Lastly, Part 5 presents a complete validation of Twin-Control features in two key industrial sectors: aerospace and automotive. The book offers a representative overview of the latest trends in the manufacturing industry, with a focus on machine tools.

Download or read book Rolling Bearing Tribology written by Gary L. Doll and published by Elsevier. This book was released on 2022-08-20 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rolling Bearing Tribology: Tribology and Failure Modes of Rolling Element Bearings discusses these machine elements that are used to accommodate motion on or about shafts in mechanical systems, with ball bearings, cylindrical roller bearings, spherical roller bearings, and tapered roller bearings reviewed. Each bearing type experiences different kinds of motion and forces with their respective raceway, retainers and guiding flanges. The material in this book identifies the tribology of the major bearing types and how that tribology depends upon materials, surfaces and lubrication. In addition, the book describes the best practices to mitigate common failure modes of rolling element bearings. Discusses important tribological implications surrounding the performance and durability of rolling element bearings Describes how the different types of roller bearings work Explores the reasons behind the failure of roller bearings and presents information on how to mitigate those failures

Download or read book Refinement and Evaluation of Rolling Bearing Load Life Model written by Y. P. Chiu and published by . This book was released on 1970 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: The phenomenon of rolling contact failure has been mathematically modeled based on a defect life model considering two principal failure modes, viz, inclusion originated subsurface spalling failure and surface spalling failure precipitated by severe asperity interaction or surface defects. The distribution of rolling element lives has been analytically formulated based on defect life for the two failure modes to yield formulas which reduce to the current standard Lundberg-Palmgren formulation when sufficiently specialized, and in its general form provides multiplicative factors taking into account matrix strength properties, defect type and number, and the geometry of the macro-stress field. Special effects on the life of large size roller bearings are discussed. Based on the differences in defect properties between large and small size bearings, an approach has been proposed to refine the application of existing load rating methods to large bearings. (Author).

Download or read book Rolling Bearing Life Prediction Past Present and Future written by and published by . This book was released on 2000 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recent Developments in Model Based and Data Driven Methods for Advanced Control and Diagnosis written by Didier Theilliol and published by Springer Nature. This book was released on 2023-07-15 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book consists of recent works on several axes either with a more theoretical nature or with a focus on applications, which will span a variety of up-to-date topics in the field of systems and control. The main market area of the contributions include: Advanced fault-tolerant control, control reconfiguration, health monitoring techniques for industrial systems, data-driven diagnosis methods, process supervision, diagnosis and control of discrete-event systems, maintenance and repair strategies, statistical methods for fault diagnosis, reliability and safety of industrial systems artificial intelligence methods for control and diagnosis, health-aware control design strategies, advanced control approaches, deep learning-based methods for control and diagnosis, reinforcement learning-based approaches for advanced control, diagnosis and prognosis techniques applied to industrial problems, Industry 4.0 as well as instrumentation and sensors. These works constitute advances in the aforementioned scientific fields and will be used by graduate as well as doctoral students along with established researchers to update themselves with the state of the art and recent advances in their respective fields. As the book includes several applicative studies with several multi-disciplinary contributions (deep learning, reinforcement learning, model-based/data-based control etc.), the book proves to be equally useful for the practitioners as well industrial professionals.

Download or read book Ball and Roller Bearings written by Johannes Brändlein and published by John Wiley & Sons. This book was released on 1999-03-12 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the third edition of the standard work for all engineers concerned with rolling bearings - in design and development; in production and operation; in maintenance and repair; in purchasing and materials management. Fully revised, features new to this edition include: * coverage of the new 'adjusted life' calculation, which takes into account the endurance strength of rolling bearings in relation to factors such as the cleanliness of the lubricant and the design of the bearing housing using the flow of force * expanded chapter on lubrication The information in this book will help bearing engineers make real-life improvements to the capacity and operational reliability of bearings in vehicles, machines, equipment and plants, saving on both time and costs. This book is an essential reference to the fundamental correlations of bearing engineering, and to all aspects of bearing design and technology.

Download or read book Rolling Contact Fatigue Testing Bearing Life Prediction and Steel Properties written by Thore B. Lund and published by . This book was released on 2012 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Few rolling bearing users realize that the fundamentals of bearing life predictions are based on experimental data derived under conditions very different from the ones generally used in RCF testing today. The basic life formulas derived in the 1940s largely were based on tests run on steel with very different characteristics than the materials used to produce bearing components today. Still, the fundamental life calculations are based on the (C/P)n concept, which was experimentally derived by Lundberg and Palmgren (Lundberg, G. and Palmgren, A., "Dynamic Capacity of Rolling Bearings," Acta Polytech. Scand., Mech. Eng. Ser., Volume 1, No. 3, 1947), even if the basic equation has been expanded and adjusted to reflect the lives recorded for modern bearings and to incorporate the concept of a fatigue limit (Ioannides, E., Bergling, G., and Gabelli, A., "An Analytical Formulation for the Life of Rolling Bearings," Acta Polytech. Scand., Mech. Eng. Ser., Volume 137, 1999, pp. 9-12, 21-24). In an attempt to better understand the premature and unpredictable failures that sometimes occur in certain industrial applications today, the test procedures used by Lundberg and Palmgren have been revisited, and data have been derived that might contribute to an understanding of the short lives sometimes experienced in certain industrial bearing applications. Based on this test procedure, a better understanding of the development of micro-crack associated plastic deformations at non-metallic inclusions also has been gained. The propensity of different non-metallic inclusions to drive the formation and growth of micro-cracks has been studied in detail, and this knowledge has been used to develop steel that is less prone to butterfly development and micro-crack growth under very high contact stress conditions. Today's bearing life prediction models presume that the Palmgren-Miner rule of accumulated damage is globally applicable. Experimental data questioning this assumption are presented.