Experimental Investigation of Whirl in Self-acting Air-lubricated Journal Bearings PDF Download
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Author: David B. Reynolds
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 1
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Book Description
Bearing characteristics influencing the threshold speed at which large-amplitude self-excited whirl occurs incomplete, air-lubricated journal bearings were experimentally investigated. Various combinations of rotors having clearance ratios, Psi = c/r, ranging from 0.000268 to 0.002350 and symmetrical bearing assemblies having slenderness ratios, L' = L/D, ranging from 1/4 to 1 were tested. By varying slenderness and clearance ratios and unit load, by opening or closing supply orifices, or by adding unbalance, the whirl threshold speed could be varied between zero and the limit set by the available power. Experimental methods of identifying the cylindrical and conical modes of synchronous and self-excited whirl are described. The whirl hysteresis region and the nature of whirl at speeds above the threshold are examined. Three methods of avoiding large-amplitude self-excited whirl are discussed. (Author).
Author: David B. Reynolds
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 1
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Book Description
Bearing characteristics influencing the threshold speed at which large-amplitude self-excited whirl occurs incomplete, air-lubricated journal bearings were experimentally investigated. Various combinations of rotors having clearance ratios, Psi = c/r, ranging from 0.000268 to 0.002350 and symmetrical bearing assemblies having slenderness ratios, L' = L/D, ranging from 1/4 to 1 were tested. By varying slenderness and clearance ratios and unit load, by opening or closing supply orifices, or by adding unbalance, the whirl threshold speed could be varied between zero and the limit set by the available power. Experimental methods of identifying the cylindrical and conical modes of synchronous and self-excited whirl are described. The whirl hysteresis region and the nature of whirl at speeds above the threshold are examined. Three methods of avoiding large-amplitude self-excited whirl are discussed. (Author).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Bearing characteristics influencing the threshold speed at which large-amplitude self-excited whirl occurs incomplete, air-lubricated journal bearings were experimentally investigated. Various combinations of rotors having clearance ratios, Psi = c/r, ranging from 0.000268 to 0.002350 and symmetrical bearing assemblies having slenderness ratios, L' = L/D, ranging from 1/4 to 1 were tested. By varying slenderness and clearance ratios and unit load, by opening or closing supply orifices, or by adding unbalance, the whirl threshold speed could be varied between zero and the limit set by the available power. Experimental methods of identifying the cylindrical and conical modes of synchronous and self-excited whirl are described. The whirl hysteresis region and the nature of whirl at speeds above the threshold are examined. Three methods of avoiding large-amplitude self-excited whirl are discussed. (Author).
Author: Darryl Chauvin (Jr.)
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Robert E. Cunningham
Publisher:
ISBN:
Category : Journal bearings
Languages : en
Pages : 18
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Book Description
Author: Naval Postgraduate School (U.S.)
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 534
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Book Description
Author:
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 736
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Book Description
![Proceedings [held] April 16-19, 1963 PDF](https://books.google.com/books/content/images/frontcover/2WRUAAAAYAAJ?fife=w80-h100)
Author: Pei Moo Ku
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 728
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Book Description
Author: Defense Documentation Center (U.S.)
Publisher:
ISBN:
Category : Lubrication and lubricants
Languages : en
Pages : 256
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Book Description
Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 588
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Book Description
Author: Farid Al-Bender
Publisher: John Wiley & Sons
ISBN: 1118926560
Category : Technology & Engineering
Languages : en
Pages : 592
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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.
