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  • 1
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    Bearings, lubricants, and seals for actuators and mechanisms (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Bearings, lubricants, and seals for lubricated and hydraulic components for space shuttle with high temperature and vacuum operating capabilities
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA SPACE SHUTTLE TECHNOL. CONF., VOL. 2 APR. 1971; P 601-632
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    New directions in lubrication, materials, wear, and surface interactions - Tribology in the 80's (1985)
    In:  Other Sources
    Details
    Publication Date: 2016-03-09
    Description: New directions in tribology are described. A range of topics is addressed, extending from fundamental research on tribological materials of all kinds and their surface effects, to final technological applications in mechanical components such as bearings, gears, and seals. The general topics addressed include: importance and definition of materials in tribology; future directions of research in adhesion and friction, wear and wear-resistant materials, and liquid lubricants and additives; status and new directions in elastohydrodynamic lubrication and solid lubricants; and tribological materials for mechanical components of the future.
    Keywords: MECHANICAL ENGINEERING
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Aircraft engine sump-fire studies (1976)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Results of ongoing experimental studies are reported in which a 125-millimeter-diameter-advanced-bearing test rig simulating an engine sump is being used to find the critical range of conditions for fires to occur. Design, material, and operating concepts and techniques are being studied with the objective of minimizing the problem. It has been found that the vapor temperature near a spark ignitor is most important in determining ignition potential. At temperatures producing oil vapor pressures below or much above the calculated flammability limits, fires have not been ignited. But fires have been routinely started within the theoretical flammability range. This indicates that generalizing the sump-fire problem may make it amenable to analysis, with the potential for realistic solutions.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: Aircraft Safety and Operating Problems; p 443-456
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Steady-state wear and friction in boundary lubrication studies (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A friction and wear study was made at 20 C to obtain improved reproducibility and reliability in boundary lubrication testing. Ester-base and C-ether-base fluids were used to lubricate a pure iron rider in sliding contact with a rotating M-50 steel disk in a friction and wear apparatus. Conditions included loads of 1/2 and 1 kg and sliding velocities of 3.6 to 18.2 m/min in a dry air atmosphere and stepwise time intervals from 1 to 250 min for wear measurements. The wear rate results were compared with those from previous studies where a single 25 min test period was used. Satisfactory test conditions for studying friction and wear in boundary lubrication for this apparatus were found to be 1 kg load; sliding velocities of 7.1 to 9.1 m/min (50 rpm disk speed); and use of a time stepwise test procedure. Highly reproducible steady-state wear rates and steady-state friction coefficients were determined under boundary conditions. Wear rates and coefficients of friction were constant following initially high values during run-in periods.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TP-1658 , E-129
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Analysis of a heat transfer device for measuring film coefficients (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A heat transfer device consisting of a heated rotating cylinder in a bath was analyzed for its effectiveness to determine heat transfer coefficient of fluids. A time dependent analysis shows that the performance is insensitive to the value of heat transfer coefficient with the given rig configuration.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-X-71809 , E-8156
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Oil-air mist lubrication as an emergency system and as a primary lubrication system (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The feasibility of an emergency aspirator once-through lubrication system was demonstrated as a viable survivability concept for Army helicopter mainshaft engine bearings for periods as long as 30 minutes. It was also shown in an experimental study using a 46-mm bore bearing test machine that an oil-air mist once-through system with auxiliary air cooling is an effective primary lubrication system at speeds up to 2,500,000 DN for extended operating periods of at least 50 hours.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-X-71892 , E-8678
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Steady-state boundary lubrication with formulated C-ethers to 260 C (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Steady state wear and friction studies were made at boundary lubrication conditions in a pin on disk (pure iron on rotating CVM M 50 steel) sliding friction apparatus with five C ether formulated fluids (modified polyphenyl ether containing phosphrous ester, organic acid, and other additives). Conditions included 20, 150, and 260 C disk temperatures, dry air test atmosphere, 1 kilogram load, 50 rpm disk speed, and test times to 130 minutes. Results were compared with those obtained with a formulated MIL L 27502 candidate ester and the C ether base fluid. Three of the C ether formulations gave better lubrication than both reference fluids under most conditions. The other two C ether formulations yielded higher wear rates and friction coefficients than the C ether base fluid for most of the temperature range. Only one C ether formulation showed consistently higher steady state wear rates than the ester.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TP-1812 , E-480
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Lubricants for inerted lubrication systems in engines for advanced aircraft (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Feasibility tests on liquid lubricants for inerted lubrication systems of advanced aircraft engines
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-5420
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    High temperature polyimide hydraulic actuator rod seals for advanced aircraft (1970)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: High temperature polyimide actuator rod seals for aircraft hydraulic systems
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-52889 , E-5863 , NATL. AERON. AND SPACE ENG. AND MANUFACTURING MEETING; Oct 05, 1970 - Oct 08, 1970; LOS ANGELES
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Performance of inerted lubrication systems for turbine engines (1967)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Performance of inerted lubrication system for high temperature turbine engines
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-61086 , E-4289 , ASME GAS TURBINE POWER DIV. CONF.; Mar 07, 1968; WASHINGTON, DC; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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