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  • MACHINERY  (2)
  • MATERIALS  (2)
  • AIRCRAFT DESIGN, TESTING AND PERFORMANCE  (1)
  • COMPUTERS  (1)
  • Mathematical and Computer Sciences (General)  (1)
Collection
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  • 1
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    OH-58 helicopter transmission failure analysis (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The OH-58 main transmission gearbox was run at varying output torques, speeds, and oil cooling rates. The gearbox was subsequently run to destruction by draining the oil from the gearbox while operating at a speed of 6200 revs per minute and 36,000 inch-pounds output torque. Primary cause of gearbox failure was overheating and melting of the planet bearing aluminum cages. Complete failure of the gearbox occurred in 28 1/2 minutes after the oil pressure dropped to zero. The alternating and maximum stresses in the gearbox top case were approximately 10 percent of the endurance limit for the material. Deflection of the bevel gear at 67000 inch-pounds output torque indicate a marginal stiffness for the bevel gear supporting system.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-X-71867 , E-8633
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Lubricant selection for gear designers (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Guide for gear designers, consisting of theory, calculations, charts, curves and references, explains lubrication requirements for gears to insure maximum performance. Mechanical and service variables are considered in order to obtain optimum gear performance under severe operating conditions.
    Keywords: MATERIALS
    Type: LEW-11483
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 3
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    RC transfer-function synthesis and digital computer application. (1967)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: RC synthesis of minimum phase transfer functions into passive networks, discussing digital computer application
    Keywords: COMPUTERS
    Type: NATIONAL SYMPOSIUM ON SATURN V/APOLLO AND BEYOND; Jun 11, 1967 - Jun 14, 1967; HUNTSVILLE, AL
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Liquid cryogenic lubricant (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Fluorinated polyethers are suitable lubricants for rolling-element bearings in cryogenic systems. Lubrication effectiveness is comparable to that of super-refined mineral oil lubricants operating at room temperature.
    Keywords: MACHINERY
    Type: LEW-11075
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 5
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    Analysis of Lubricant Jet Flow (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Computer program, IMPOUT 2, developed using newly-established "limit formulas" to prevent lubricant non-impingement on pinion. Program used to analyze impingement depth on gear teeth for oil jet located at out-of-mesh position with arbitrary offset and inclination angles and with arbitrary addendum and center-distance modification. IMPOUT 2 program written in ANSI FORTRAN IV for use on CDC 750.
    Keywords: MACHINERY
    Type: LEW-14242 , NASA Tech Briefs (ISSN 0145-319X); 10; 2; P. 104
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Lubricants and Additives Affect Spur-Gear Fatigue (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Surface-fatigue tests conducted with AISI 9310 steel spur gears show surface-fatigue life of AISI 9310 steel spur gears increased as much as 400 percent by addition of small amount of phosphorus-type extreme-pressure (EP) additive in lubricant. Antiwear or EP additives either absorbed onto surface or react with surface to form protective coating or surface film. Boundary film provides barrier that prevents contact of metal surfaces and provides low shear strength, which reduces friction coefficient below base metal.
    Keywords: MATERIALS
    Type: LEW-14314 , NASA Tech Briefs (ISSN 0145-319X); 10; 5; P. 84
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    A Computer Program for the Computation of Running Gear Temperatures Using Green's Function (1996)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A new technique has been developed to study two dimensional heat transfer problems in gears. This technique consists of transforming the heat equation into a line integral equation with the use of Green's theorem. The equation is then expressed in terms of eigenfunctions that satisfy the Helmholtz equation, and their corresponding eigenvalues for an arbitrarily shaped region of interest. The eigenfunction are obtalned by solving an intergral equation. Once the eigenfunctions are found, the temperature is expanded in terms of the eigenfunctions with unknown time dependent coefficients that can be solved by using Runge Kutta methods. The time integration is extremely efficient. Therefore, any changes in the time dependent coefficients or source terms in the boundary conditions do not impose a great computational burden on the user. The method is demonstrated by applying it to a sample gear tooth. Temperature histories at representative surface locatons are given.
    Keywords: Mathematical and Computer Sciences (General)
    Type: NASA-TM-107241 , E-10286 , NAS 1.15:107241 , AD-A318138 , ARL-TR-1117 , Power Transmission and Gearing; Oct 06, 1996 - Oct 09, 1996; San Diego, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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