Download or read book Numerical Investigation of Bouncing Vibrations of an Air Bearing Slider in Near Or Partial Contact written by Du Chen and published by . This book was released on 2007 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Partial contact Head Disk Interface for Ultrahigh Density Magnetic Recording written by Du Chen and published by . This book was released on 2008 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Tribology written by and published by . This book was released on 2007 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the International Symposium on Micro NanoMechatronics and Human Science written by and published by . This book was released on 2004 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics and Stability of Thermal Flying height Control Sliders in Hard Disk Drives written by Jinglin Zheng and published by . This book was released on 2012 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a recent development to further reduce the flying height of a magnetic head in hard disk drives (HDDs) to nanometers, thermal flying-height (TFC) control technology is now widely applied in the HDD industry because it enables consistent read/write spacing, increased storage density and improved HDD reliability. The fast development of TFC technology presents new challenges to head designers because of the complicated structure of a TFC head, the thermo-mechanical-coupling effects and tribology issues arising at nanometer read/write spacing. A steady-state TFC solver dedicated to obtaining the steady-state flying attitude of a TFC slider is developed in this thesis. This solver uses a finite volume based solver (CML static solver) to solve the generalized Reynolds equation and obtain the pressure and spacing fields in the air bearing and a commercial coupled-field solver (ANSYS) to obtain the stress and strain fields due to internal heating. An iterative procedure is adopted to consider the cooling effect of the air bearing on the heater-induced protrusion. Accuracy of the solver is verified by drive-level magnetic tests on several combinations of air bearing and heater designs. TFC sliders' performances under different ambient conditions are investigated based on the TFC solver. It is found that the thermal actuation efficiency of a TFC slider increases with altitude because of the weakened cooling and reduced air bearing stiffness at the transducer area at a higher altitude. In addition, a TFC slider maintains a more consistent read/write spacing at different humidity levels, compared with a non-TFC slider, because the thermal actuation is able to compensate part of the pressure loss caused by water condensation. A TFC slider's flying height in air-helium mixtures is shown to be a highly nonlinear function of the fraction of helium in the gas mixture due to the combined effects of the gas mean free path, viscosity and heat conductivity. These results provide general guidelines for heater and ABS designers to reduce a TFC slider's sensitivity to ambient conditions and improve HDD reliability. A touchdown numerical model for predicting TFC sliders' dynamics at touchdown and over-pushed conditions is developed and implemented based on the CML dynamic simulator. It extends the solution of the time-varying generalized Reynolds equation to near-contact and contact conditions using a statistical multi-asperity approach. Various interfacial forces are considered by use and further development of a sub-boundary lubrication model to capture important tribological effects occurring at touchdown. This model is able to predict a TFC slider's unstable dynamics at the beginning of touchdown, which has been discovered in many related experimental studies. The effects of different head-disk interface factors are investigated using this numerical model. It is found that the suspension is actively involved in the TFC slider's bouncing vibrations and has a significant influence on the excited second air bearing pitch mode. It is also shown that adhesion force serves as an essential factor in exciting the second air bearing mode whereas other interfacial forces only affect details of the slider's bouncing behaviors. By changing the interfacial properties, namely, the interface roughness and lubricant thickness, the variation of interfacial forces with spacing reduction differs, which leads to very different touchdown patterns. With a rougher interface profile the slider smoothly transfers from a flying stage to a sliding stage. With a smoother interface profile the slider experiences a flying-bouncing-sliding transition. With the smoothest interface the slider goes through a flying-bouncing-surfing-sliding transition. The touchdown behaviors predicted by the numerical simulator are correlated with experiments conducted on industry-provided head parts with the same ABS and suspension design. Similar touchdown stages and excited modes are also discovered in the experiments. Though experiments showed a slider spectrum with richer frequency components, the modes missed from the numerical simulations are recovered by conducting a harmonic analysis on a full HGA model with air bearing included. The different touchdown dynamic patterns predicted here result in significant differences in the successful touchdown detection, which is very important for realizing reliable read/write operations, and therefore this work provides guidelines for head disk interface (HDI) optimization. The general approach proposed here is also applicable to studies on the effects of other important HDI factors, such as air bearing geometric features, heater-induced protrusion profiles, and suspension design parameters, and on the slider's touchdown dynamics behaviors, which will assist in obtaining solutions to performance and reliability issues in current hard disk drives.
Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 2240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1992 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Science Technology Index written by and published by . This book was released on 2000 with total page 1688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book IEICE Transactions on Electronics written by and published by . This book was released on 2002 with total page 866 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Contact Mechanics written by Valentin L. Popov and published by Springer. This book was released on 2019-04-26 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book contains a structured collection of the complete solutions of all essential axisymmetric contact problems. Based on a systematic distinction regarding the type of contact, the regime of friction and the contact geometry, a multitude of technically relevant contact problems from mechanical engineering, the automotive industry and medical engineering are discussed. In addition to contact problems between isotropic elastic and viscoelastic media, contact problems between transversal-isotropic elastic materials and functionally graded materials are addressed, too. The optimization of the latter is a focus of current research especially in the fields of actuator technology and biomechanics. The book takes into account adhesive effects which allow access to contact-mechanical questions about micro- and nano-electromechanical systems. Solutions of the contact problems include both the relationships between the macroscopic force, displacement and contact length, as well as the stress and displacement fields at the surface and, if appropriate, within the half-space medium. Solutions are always obtained with the simplest available method - usually with the method of dimensionality reduction (MDR) or approaches which use the solution of the non-adhesive normal contact problem to solve the respective contact problem.
Download or read book Harris Shock and Vibration Handbook written by Allan G. Piersol and published by McGraw Hill Professional. This book was released on 2009-10-01 with total page 1199 pages. Available in PDF, EPUB and Kindle. Book excerpt: The classic reference on shock and vibration, fully updated with the latest advances in the field Written by a team of internationally recognized experts, this comprehensive resource provides all the information you need to design, analyze, install, and maintain systems subject to mechanical shock and vibration. The book covers theory, instrumentation, measurement, testing, control methodologies, and practical applications. Harris' Shock and Vibration Handbook, Sixth Edition, has been extensively revised to include innovative techniques and technologies, such as the use of waveform replication, wavelets, and temporal moments. Learn how to successfully apply theory to solve frequently encountered problems. This definitive guide is essential for mechanical, aeronautical, acoustical, civil, electrical, and transportation engineers. EVERYTHING YOU NEED TO KNOW ABOUT MECHANICAL SHOCK AND VIBRATION, INCLUDING Fundamental theory Instrumentation and measurements Procedures for analyzing and testing systems subject to shock and vibration Ground-motion, fluid-flow, wind-. and sound-induced vibration Methods for controlling shock and vibration Equipment design The effects of shock and vibration on humans
Download or read book Handbook of Friction Vibration Interactions written by Gang Sheng Chen and published by Woodhead Publishing. This book was released on 2017-11-13 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 lifeIntroduces the principles of friction-vibration interactionsAnalyzes, presents experiments, and treats real systems ranging from nano to micro to macro scales
Download or read book 200 Science Investigations for Young Students written by Martin Wenham and published by SAGE. This book was released on 2000-12-13 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book enables teachers to develop a complete range of basic investigations for science with students aged five to 11 years. It demonstrates how children can use hands-on activities to consolidate and extend their knowledge and understanding. Investigations are presented in a generic form, so that teachers can work through them and adapt them to meet the particular needs of their own classes. The presentation of activities ranges from highly-structured sequences of instructions and questions (with answers!), to more general discussions, depending on the approach needed and the likely variations in equipment and materials available. Each activity is aimed to help any teacher carry out significant scientific investigations with their class, and where necessary, to learn alongside them. - Almost every investigation and activity has been tested by the author. - Investigations use readily-available, non-specialist or recycled materials. The context of this book is children′s need to learn through first-hand experience of the world around them. This book is an essential resource for teachers planning an effective science programme, or for student teachers needing to broaden their scientific knowledge and understanding. 200 Science Investigations for Young Students is the companion volume of activities which demonstrate the theories in Martin Wenham′s Understanding Primary Science. The content has been guided by, but not limited to, The National Curriculum 2000 and the Initial Teacher Training Curriculum for Primary Science, issued by the Teacher Training Agency.
Download or read book Railway Noise and Vibration written by David Thompson and published by Elsevier. This book was released on 2008-12-11 with total page 535 pages. Available in PDF, EPUB and Kindle. Book excerpt: Railways are an environmentally friendly means of transport well suited to modern society. However, noise and vibration are key obstacles to further development of the railway networks for high-speed intercity traffic, for freight and for suburban metros and light-rail. All too often noise problems are dealt with inefficiently due to lack of understanding of the problem. This book brings together coverage of the theory of railway noise and vibration with practical applications of noise control technology at source to solve noise and vibration problems from railways. Each source of noise and vibration is described in a systematic way: rolling noise, curve squeal, bridge noise, aerodynamic noise, ground vibration and ground-borne noise, and vehicle interior noise. Theoretical modelling approaches are introduced for each source in a tutorial fashion Practical applications of noise control technology are presented using the theoretical models Extensive examples of application to noise reduction techniques are included Railway Noise and Vibration is a hard-working reference and will be invaluable to all who have to deal with noise and vibration from railways, whether working in the industry or in consultancy or academic research. David Thompson is Professor of Railway Noise and Vibration at the Institute of Sound and Vibration Research, University of Southampton. He has worked in the field of railway noise since 1980, with British Rail Research in Derby, UK, and TNO Institute of Applied Physics in the Netherlands before moving to Southampton in 1996. He was responsible for developing the TWINS software for predicting rolling noise. Discusses fully the theoretical background and practical workings of railway noise Includes the latest research findings, brought together in one place Forms an extended case study in the application of noise control techniques
Download or read book Rapid Prototyping and Flexible Manufacturing written by Rolf-Jürgen Ahlers and published by SPIE-International Society for Optical Engineering. This book was released on 1997 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Earth Sound Earth Signal written by Douglas Kahn and published by Univ of California Press. This book was released on 2013-08-30 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earth Sound Earth Signal is a study of energies in aesthetics and the arts, from the birth of modern communications in the nineteenth century to the global transmissions of the present day. Grounded in the Aeolian sphere music that Henry David Thoreau heard blowing in telegraph lines and in the Aelectrosonic sounds of natural radio that Thomas Watson heard in telephone lines, the book moves through the histories of science, media, music, and the arts to the 1960s, when the composer Alvin Lucier worked with the ""natural electromagnetic sounds"" present from ""brainwaves to outer.
Download or read book Friction Dynamics written by Xiandong Liu and published by Woodhead Publishing. This book was released on 2016-07-20 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Friction Dynamics: Principles and Applications introduces readers to the basic principles of friction dynamics, which are presented in a unified theoretical framework focusing on some of the most important engineering applications. The book's chapters introduce basic concepts and analytical methods of friction dynamics, followed by sections that explore the fundamental principles of frictions. Concluding chapters focus on engineering applications in brake dynamics, the friction dynamics of rods used in oil suck pump systems, and the friction impact dynamics of rotors. This book provides comprehensive topics and up-to-date results, also presenting a thorough account of important advancements in friction dynamics which offer insights into varied dynamic phenomena, helping readers effectively design and fabricate stable and durable friction systems and components for various engineering and scientific friction dynamical systems. Investigates the most critical engineering and scientific applications Provides the most comprehensive reference of its kind Offers a systematic treatment and a unified framework Explores cutting-edge methodologies to address non-stationary, non-linear dynamics and control
