Author: Kenneth W. Stark
Publisher:
ISBN:
Category : Simulation
Languages : en
Pages : 24
Get Book Here
Book Description
Several types of air bearings are discussed and analyzed which can effectively simulate a frictionless environment for testing space vehicle instruments and control systems. A spherical dual-flow bearing, designed for a load of 15 pounds and employing an input pressure of about 4.5 psi, has been operated with an effective coefficient of friction of only 0.00000406. However, unless all externally applied torques as well as the center of gravity of the test fixture are exactly are the bearing's center of gravity of the test fixture are exactly at the bearing's center of rotation, it will precess. This is overcome in a cylindrical dual-flow bearing designed on the same principal. A spherical mono-flow bearing, which will bear loads of 700 and 400 pounds respectively with low input pressures, are also discussed. Plots of theoretical and actual performance are given, and fabrication techniques are described.
Author: Kenneth W. Stark
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
Get Book Here
Book Description
Author: Farid Al-Bender
Publisher: John Wiley & Sons
ISBN: 1118511492
Category : Technology & Engineering
Languages : en
Pages : 592
Get Book Here
Book Description
Comprehensive treatise on gas bearing theory, design and application This book treats the fundamental aspects of gas bearings of different configurations (thrust, radial, circular, conical) and operating principles (externally pressurized, self-acting, hybrid, squeeze), guiding the reader throughout the design process from theoretical modelling, design parameters, numerical formulation, through experimental characterisation and practical design and fabrication. The book devotes a substantial part to the dynamic stability issues (pneumatic hammering, sub-synchronous whirling, active dynamic compensation and control), treating them comprehensively from theoretical and experimental points of view. Key features: Systematic and thorough treatment of the topic. Summarizes relevant previous knowledge with extensive references. Includes numerical modelling and solutions useful for practical application. Thorough treatment of the gas-film dynamics problem including active control. Discusses high-speed bearings and applications. Air Bearings: Theory, Design and Applications is a useful reference for academics, researchers, instructors, and design engineers. The contents will help readers to formulate a gas-bearing problem correctly, set up the basic equations, solve them establishing the static and dynamic characteristics, utilise these to examine the scope of the design space of a given problem, and evaluate practical issues, be they in design, construction or testing.
Author: John William Powell
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 288
Get Book Here
Book Description
Author: Jitendra Prasad Khatait
Publisher: LAP Lambert Academic Publishing
ISBN: 9783847341994
Category :
Languages : en
Pages : 116
Get Book Here
Book Description
Air bearings are extensively used in precision machine design. Unlike conventional bearings, there is no physical contact between the moving surfaces. The moving surface can glide smoothly on the other surface, minimizing the control effort to achieve high accuracy and precision. Despite many advantages over conventional bearings, their application is still very limited. Cost and complexities in the design are the major deterrents. The orifice-type of air bearings are cheaper, but require good and innovative design to achieve better performance and stability in comparison to the porous-type. This book offers an analytical approach to understand the dynamics and the performance behavior of a single orifice, circular-pocketed air thrust bearing. The effect of various input parameters on the performance of the air bearing was studied. Based on the analytical results, a simple design methodology was developed to assist in the design and selection of air bearings. CFD simulation and experiments were carried out for validation purposes. An experimental set-up was designed to test static and dynamic performance characteristics of the air bearings.
Author: W. Brian Rowe
Publisher: Butterworth-Heinemann
ISBN: 0123972396
Category : Technology & Engineering
Languages : en
Pages : 353
Get Book Here
Book Description
Solve your bearing design problems with step-by-step procedures and hard-won performance data from a leading expert and consultant Compiled for ease of use in practical design scenarios, Hydrostatic, Aerostatic and Hybrid Bearing Design provides the basic principles, design procedures and data you need to create the right bearing solution for your requirements. In this valuable reference and design companion, author and expert W. Brian Rowe shares the hard-won lessons and figures from a lifetime’s research and consultancy experience. Coverage includes: Clear explanation of background theory such as factors governing pressure, flow and forces, followed by worked examples that allow you to check your knowledge and understanding Easy-to-follow design procedures that provide step-by-step blueprints for solving your own design problems Information on a wide selection of bearing shapes, offering a range and depth of bearing coverage not found elsewhere Critical data on optimum performance from load and film stiffness data to pressure ratio considerations Operating safeguards you need to keep in mind to prevent hot-spots and cavitation effects, helping your bearing design to withstand the demands of its intended application Aimed at both experienced designers and those new to bearing design, Hydrostatic, Aerostatic and Hybrid Bearing Design provides engineers, tribologists and students with a one-stop source of inspiration, information and critical considerations for bearing design success. Structured, easy to follow design procedures put theory into practice and provide step-by-step blueprints for solving your own design problems. Covers a wide selection of bearing shapes, offering a range and depth of information on hydrostatic, hybrid and aerostatic bearings not found elsewhere. Includes critical data on optimum performance, with design specifics from load and film stiffness data to pressure ratio considerations that are essential to make your design a success.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 912
Get Book Here
Book Description
Author: William A. Burgess
Publisher: John Wiley & Sons
ISBN: 0471667048
Category : Science
Languages : en
Pages : 575
Get Book Here
Book Description
The second edition of Ventilation Control of the Work Environment incorporates changes in the field of industrial hygiene since the first edition was published in 1982. Integrating feedback from students and professionals, the new edition includes problems sets for each chapter and updated information on the modeling of exhaust ventilation systems, and thus assures the continuation of the book's role as the primary industry textbook. This revised text includes a large amount of material on HVAC systems, and has been updated to reflect the changes in the Ventilation Manual published by ACGIH. It uses both English and metric units, and each chapter concludes with a problem set.
Author: Harald Ibach
Publisher: Springer Science & Business Media
ISBN: 3540347100
Category : Science
Languages : en
Pages : 653
Get Book Here
Book Description
This graduate-level textbook covers the major developments in surface sciences of recent decades, from experimental tricks and basic techniques to the latest experimental methods and theoretical understanding. It is unique in its attempt to treat the physics of surfaces, thin films and interfaces, surface chemistry, thermodynamics, statistical physics and the physics of the solid/electrolyte interface in an integral manner, rather than in separate compartments. It is designed as a handbook for the researcher as well as a study-text for graduate students. Written explanations are supported by 350 graphs and illustrations.
Author: Rolf-Jürgen Ahlers
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Computers
Languages : en
Pages : 168
Get Book Here
Book Description
