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  • 1
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    Advancements in bearings, seals, and lubricants (1971)
    In:  CASI
    Details
    Publication Date: 2009-11-16
    Description: Development of bearings, seals, and lubricants for air breathing turbojet engines
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: AIRCRAFT PROPULSION 1971; P 421-463
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Lubricants, bearings and seals (1966)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Extreme temperature, vacuum, and chemically active fluid effects on bearing and sealing materials and lubricants
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Effect of materials - General background (1970)
    In:  CASI
    Details
    Publication Date: 2006-04-20
    Description: Roller bearing material technology
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: INTERDISCIPLINARY APPROACH TO THE LUBRICATION OF CONCENTRATED CONTACTS 1970; P 379-408
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Effect of design variables, temperature gradients, and speed on life and reliability of a rotating disk (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A generalized methodology to predict the fatigue life and reliability of a rotating disk such as used for aircraft engine turbines and compressors is advanced. The approach incorporates the computed life of elemental stress volumes to predict system life and reliability. Disk speed and thermal gradients as well as design varibles such as disk diameter and thickness and bolt hole size, number and location are considered.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME, Transactions, Journal of Vibration, Acoustics, Stress, and Reliability in Design (ISSN 0739-3717); 111; 311-316
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The changing technology of rolling-element bearings. (1966)
    In:  Other Sources
    Details
    Publication Date: 2011-08-11
    Description: Rolling-element bearings design and material processing for special conditions, noting stress and fatigue
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: MACHINE DESIGN
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    EHD lubrication. (1968)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Elastohydrodynamic lubrication, discussing film thickness and dependence on fluid hydrodynamics and contact zone deformation
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: ; ADEMIE DES SCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    NASA transmission research and its probable effects on helicopter transmission design (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Transmissions studied for application to helicopters in addition to the more conventional geared transmissions include hybrid (traction/gear), bearingless planetary, and split torque transmissions. Research is being performed to establish the validity of analysis and computer codes developed to predict the performance, efficiency, life, and reliability of these transmissions. Results of this research should provide the transmission designer with analytical tools to design for minimum weight and noise with maximum life and efficiency. In addition, the advantages and limitations of drive systems as well as the more conventional systems will be defined.
    Keywords: MECHANICAL ENGINEERING
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Lubrication and performance of high-speed rolling-element bearings (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Trends in aircraft engine operating speeds have dictated the need for rolling-element bearings capable of speeds to 3 million DN. A review of high-speed rolling-element bearing state-of-the-art performance and lubrication is presented. Through the use of under-race lubrication and bearing thermal management bearing operation can be obtained to speeds of 3 million DN. Jet lubricated ball bearings are limited to 2.5 million DN for large bore sizes and to 3 million DN for small bore sizes. Current computer programs are able to predict bearing thermal performance.
    Keywords: MECHANICAL ENGINEERING
    Type: Lubrication Engineering (ISSN 0024-7154); 41; 725-732
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Operating characteristics of a 0.87 kW-hr flywheel energy storage module (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Discussion is given of the design and loss characteristics of 0.87 kW-hr (peak) flywheel energy storage module suitable for aerospace and automotive applications. The maraging steel flywheel rotor, a 46-cm-(18-in-) diameter, 58-kg (128-lb) tapered disk, delivers 0.65 kW-hr of usable energy between operating speeds of 10,000 and 20,000 rpm. The rotor is supported by 20- and 25-mm bore diameter, deep-groove ball bearings, lubricated by a self-replenishing wick type lubrication system. To reduce aerodynamic losses, the rotor housing was evacuated to vacuum levels from 40 to 200 millitorr. Dynamic rotor instabilities uncovered during testing necessitated the use of an elastometric-bearing damper to limit shaft excursions. Spindown losses from bearing, seal, and aerodynamic drag at 50 millitorr typically ranged from 64 to 193 W at 10,000 and 20,000 rpm, respectively. Discharge efficiency of the flywheel system exceeded 96 percent at torque levels greater than 21 percent of rated torque.
    Keywords: MECHANICAL ENGINEERING
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Advances in high-speed rolling-element bearings (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The research program begun by NASA in 1959 in order to investigate the projected temperature and speed requirements of large bore ball and roller bearings was expanded in the 1970s to include tapered roller and small bore bearings. In the course of the program, bearing speeds as high as 3 million DN and 2.4 million DN, respectively, were achieved for ball and tapered roller bearings with fatigue lives exceeding those common in commercial aircraft. The computer analysis of rolling element bearings operation have yielded reasonably accurate performance predictions for speeds up to 3 million DN. It was found that under-race bearing lubrication improved operational performance over that achieved with conventional jet lubrication methods at high bearing speeds.
    Keywords: MECHANICAL ENGINEERING
    Format: text
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    NASA TECHNICAL REPORTS
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