Publisher : Transportation Research Board
Category : Pavements
ISBN : 0309068746
Type : PDF, Epub and Audiobooks
Views : 66

This synthesis report will be of interest to pavement design, construction, management, and research engineers, highway safety officials, and others concerned with pavement friction characteristics. It describes the current state of the practice and discusses the methods used for evaluating wet pavement friction characteristics of new and restored pavements. This synthesis reviews models used for measuring and evaluating friction and texture, causes for friction changes over time, and aggregate and mix design to provide adequate friction. Also presented are construction and surface restoration practices for providing good pavement surface characteristics. In addition, considerations of noise and ride quality are discussed when compromise may be required.

Publisher : Springer Science & Business Media
Category : Technology & Engineering
ISBN : 0792391330
Type : PDF, Epub and Audiobooks
Views : 173

It is my ambition in writing this book to bring tribology to the study of control of machines with friction. Tribology, from the greek for study of rubbing, is the discipline that concerns itself with friction, wear and lubrication. Tribology spans a great range of disciplines, from surface physics to lubrication chemistry and engineering, and comprises investigators in diverse specialities. The English language tribology literature now grows at a rate of some 700 articles per year. But for all of this activity, in the three years that I have been concerned with the control of machines with friction, I have but once met a fellow controls engineer who was aware that the field existed, this including many who were concerned with friction. In this vein I must confess that, before undertaking these investigations, I too was unaware that an active discipline of friction existed. The experience stands out as a mark of the specialization of our time. Within tribology, experimental and theoretical understanding of friction in lubricated machines is well developed. The controls engineer's interest is in dynamics, which is not the central interest of the tribologist. The tribologist is more often concerned with wear, with respect to which there has been enormous progress - witness the many mechanisms which we buy today that are lubricated once only, and that at the factory. Though a secondary interest, frictional dynamics are note forgotten by tribology.

Publisher : CRC Press
Category : Technology & Engineering
ISBN : 0849381371
Type : PDF, Epub and Audiobooks
Views : 424

Taking a mechanistic approach that emphasizes the physical behavior of rubber as it slides, Analyzing Friction in the Design of Rubber Products and Their Paired Surfaces integrates the engineering and scientific evidence demonstrating that the laws of metallic friction do not apply to rubber. The book also presents a newly developed, scientifically based unified theory of rubber friction that incorporates a fourth basic rubber friction force: surface deformation hysteresis. With applications that phenomenologically treat both static and dynamic rubber friction, the book offers practical guidance for implementing the unified theory in the analysis and design processes. The use of this theory enables comprehensive calculations of rubber friction, thereby offering opportunities to enhance public safety. While the theory applies to all elastomeric products where friction is an issue, the author primarily focuses on: • Analyzing friction in the design of rubber tires and their contacted pavements • The geometric design of roadways • Motor vehicle accident reconstruction • Analyzing slip resistance in the design of footwear and their contacted walking surfaces Supported by extensive analytical evidence, this book details what rubber friction is and why it behaves the way it does.

Publisher : powerHouse Books
Category : Business & Economics
ISBN : 9781576878835
Type : PDF, Epub and Audiobooks
Views : 240

Every industry around the globe is being completely disrupted. Stalwart brands are losing market share to upstarts that capture our collective consciousness. Trillions of dollars are at stake. Brands know a new approach is needed. But most don’t realize the strategic underpinnings need to change. Great brands are no longer built through interruptive advertisements. Friction argues that brands don't simply need clever messages or new, shiny technologies. They need a fundamental change in strategy. Friction provides a system for embracing transparency, engaging audiences, creating evangelists, and unleashing unprecedented growth. The authors of Friction have worked on some of the industry's most innovative assignments for the world’s most successful brands. This groundbreaking book reveals how corporations can divorce themselves from legacy business models to create a passion brand. A brand that breaks its addiction to traditional advertising. A brand that empowers its customers. A brand that dominates the competition.

Publisher : Princeton University Press
Category : Social Science
ISBN : 9781400830596
Type : PDF, Epub and Audiobooks
Views : 344

A wheel turns because of its encounter with the surface of the road; spinning in the air it goes nowhere. Rubbing two sticks together produces heat and light; one stick alone is just a stick. In both cases, it is friction that produces movement, action, effect. Challenging the widespread view that globalization invariably signifies a "clash" of cultures, anthropologist Anna Tsing here develops friction in its place as a metaphor for the diverse and conflicting social interactions that make up our contemporary world. She focuses on one particular "zone of awkward engagement"--the rainforests of Indonesia--where in the 1980s and the 1990s capitalist interests increasingly reshaped the landscape not so much through corporate design as through awkward chains of legal and illegal entrepreneurs that wrested the land from previous claimants, creating resources for distant markets. In response, environmental movements arose to defend the rainforests and the communities of people who live in them. Not confined to a village, a province, or a nation, the social drama of the Indonesian rainforest includes local and national environmentalists, international science, North American investors, advocates for Brazilian rubber tappers, UN funding agencies, mountaineers, village elders, and urban students, among others--all combining in unpredictable, messy misunderstandings, but misunderstandings that sometimes work out. Providing a portfolio of methods to study global interconnections, Tsing shows how curious and creative cultural differences are in the grip of worldly encounter, and how much is overlooked in contemporary theories of the global.

Publisher : World Scientific
Category : Technology & Engineering
ISBN : 9789812811271
Type : PDF, Epub and Audiobooks
Views : 332

Dynamics with friction: Modeling, analysis and experiments, part II. ch. 1. Interaction of vibration and friction at dry sliding contacts / Daniel P. Hess -- ch. 2. Vibrations and friction-induced instability in discs / John E. Mottershead -- ch. 3. Dynamics of flexible links in kinematic chains / Dan B. Marghitu and Ardeshir Guran -- ch. 4. Solitons, chaos and modal interactions in periodic structures / M.A. Davies and F.C. Moon -- ch. 5. Analysis and modeling of an experimental frictionally excited beam / R.V. Kappagantu and B.F. Feeny -- ch. 6. Transient waves in linear viscoelastic media / Francesco Mainardi -- ch. 7. Dynamic stability and nonlinear parametric vibrations of rectangular plates / G.L. Ostiguy -- ch. 8. Friction modelling and dynamic computation / J.P. Meijaard -- ch. 9. Damping through use of passive and semi-active dry friction forces / Aldo A. Ferri

Publisher : Springer Science & Business Media
Category : Technology & Engineering
ISBN : 9783642334511
Type : PDF, Epub and Audiobooks
Views : 333

Friction Material Composites is the first volume of the five volumes which strongly educates and updates engineers and other professionals in braking industries, research and test labs. It explains besides the formulation of design processes and its complete manufacturing input. This book gives an idea of mechanisms of friction and how to control them by designing .The book is useful for designers of automotive, rail and aero industries for designing the brake systems effectively with the integration of friction material composite design which is critical. It clearly emphasizes the driving safety and how serious designers should select the design input. The significance of friction material component like brake pad or a liner as an integral part of the brake system of vehicles is explained. AFM pictures at nanolevel illustrate broadly the explanations given.

Publisher : Elsevier
Category : Technology & Engineering
ISBN : 9780857094599
Type : PDF, Epub and Audiobooks
Views : 410

Friction-vibration interactions are common but important phenomena in science and engineering. Handbook of Friction-Vibration Interactions introduces the principles and provides the resources to understand and work with them. A unified theoretical framework includes some of the most important engineering applications. The first three chapters in the book introduce basic concepts and analytical methods of friction and vibration. The fourth chapter presents the general principles on friction-vibration interactions, and also touches on various engineering applications. In the fifth chapter the concepts and methods are extended to some of the most critical engineering applications in high-tech industry, presenting the friction-vibration interaction principle and applications in data storage systems. Covers a key topic in science and engineering, with applications in daily life Introduces the principles of friction-vibration interactions Analyzes, presents experiments, and treats real systems ranging from nano to micro to macro scales

Publisher : Elsevier
Category : Technology & Engineering
ISBN : 9781483152059
Type : PDF, Epub and Audiobooks
Views : 426

Friction and Wear in Polymer-Based Materials discusses friction and wear problems in polymer-based materials. The book is organized into three parts. The chapters in Part I cover the basic laws of friction and wear in polymer-based materials. Topics covered include frictional interaction during metal-polymer contact and the influence of operating conditions on wear in polymers. The chapters in Part II discuss the structure and frictional properties of polymer-based materials; the mechanism of frictional transfer when a polymer comes into contact with polymers, metals, and other materials; and controlling the frictional properties of polymer materials. Part III is devoted to applications of polymer-based materials in friction assemblies. It covers composite self-lubricating materials and polymer materials for complexly loaded main friction assemblies. This work may prove useful to specialists interested in the problems of using polymer materials. It also aims to stimulate deeper research into the field of friction and wear in polymer-based materials.

Publisher :
Category : Friction
ISBN : MINN:31951002931025V
Type : PDF, Epub and Audiobooks
Views : 40

This study investigates the relative influence of various parameters on the kinetic friction coefficient mu sub k between ice and different surfaces. Friction tests were performed with urea-doped, columnar ice, studying the parameters of normal pressure, velocity, type of material, material roughness, ice orientation, ice hardness and test configuration. Tests were conducted by pulling a sample of ice over a sheet of material and by pulling a sample of material over an ice sheet. An ambient temperature of -1.5 + or - 1 deg C was maintained throughout, and the ice surface hardness was measured using a specially designed apparatus. The results of the friction tests revealed that the behavior of mu sub k with varying velocity was significantly influenced by the test configuration and material roughness. The magnitude of the kinetic friction coefficient was also affected by varying normal pressure, surface roughness and ice hardness. Additional guidelines for standardized ice friction tests and future investigations were recommended.