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  • Mechanical Engineering  (3)
  • MACHINERY  (2)
  • STRUCTURAL MECHANICS  (2)
  • COMPUTERS  (1)
  • Mathematical and Computer Sciences (General)  (1)
  • 1
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    A simple method for determining the bending moment equation that includes vehicle elastic and sloshing modes and a numerical example (1964)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Bending moment of vehicle in terms of control parameters - vehicle elastic and sloshing modes
    Keywords: STRUCTURAL MECHANICS
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    NASA TECHNICAL REPORTS
  • 2
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    Determination of Principal Curvatures and Contact Ellipse for Profile Crowned Helical Gears (1999)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: Helical gears with localized bearing contact of tooth surfaces achieved by profile crowning of tooth surfaces are considered. Profile crowning is provided by application of two imaginary rack-cutters with mismatched surfaces. The goal is to determine the dimensions and orientation of the instantaneous contact ellipse that requires the determination of principle curvatures of pinion-gear tooth surfaces. A simplified solution to this problem is proposed based on the approach development for correlation of principal curvatures and directions of generating and generated tooth surfaces. The obtained equations are applied for profile crowning where the normal profiles of the rack-cutters are either a circular arc or a straight line.
    Keywords: Mechanical Engineering
    Type: Journal of Mechanical Design; Volume 121; 107-111
    Format: text
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  • 3
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    Computerized Simulation of Meshing of Conventional Helical Involute Gears and Modification of Geometry (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An approach is proposed for computerized simulation of meshing of aligned and misaligned involute helical gears. Algorithms for TCA (Tooth Contact Analysis) computer programs were developed. Influence of misalignment on the shift of the bearing contact and transmission errors has been investigated. Numerical examples that illustrate the developed theory are provided.
    Keywords: Mechanical Engineering
    Type: NASA-TM-107451 , E-10732 , NAS 1.15:107451 , ARL-TR-1370
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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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
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  • 5
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    Elastohydrodynamic principles applied to the design of helicopter components. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Elastohydrodynamic principles affecting the lubrication of transmission components are presented and discussed. Surface temperatures of the transmission bearings and gears affect elastohydrodynamic film thickness. Traction forces and sliding as well as the inlet temperature determine surface temperatures. High contact ratio gears cause increased sliding and may run at higher surface temperatures. Component life is a function of the ratio of elastohydrodynamic film thickness to composite surface roughness. Lubricant starvation reduces elastohydrodynamic film thickness and increases surface temperatures. Methods are presented which allow for the application of elastohydrodynamic principles to transmission design in order to increase system life and reliability.
    Keywords: STRUCTURAL MECHANICS
    Type: AHS PREPRINT 770 , Annual National Forum; May 09, 1973 - May 11, 1973; Washington, DC
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  • 6
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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
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  • 7
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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
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  • 8
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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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  • 9
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    Vibration Signature Analysis of a Faulted Gear Transmission System (1996)
    In:  Other Sources
    Details
    Publication Date: 2019-08-16
    Description: A comprehensive procedure in predicting faults in gear transmission systems under normal operating conditions is presented. Experimental data were obtained from a spiral bevel gear fatigue test rig at NASA/Lewis. Time-synchronous-averaged vibration data were recorded throughout the test as the fault progressed from a small single pit to severe pitting over several teeth, and finally tooth fracture. A numerical procedure based on the Wigner-Ville distribution was used to examine the time-averaged vibration data. Results from the Wigner-Ville procedure are compared to results from a variety of signal analysis techniques that include time-domain analysis methods and frequency analysis methods. Using photographs of the gear tooth at various stages of damage, the limitations and accuracy of the various techniques are compared and discussed. Conclusions are drawn from the comparison of the different approaches as well as the applicability of the Wigner-Ville method in predicting gear faults.
    Keywords: Mechanical Engineering
    Type: AIAA Paper 94-2937 , E-8914-1 , Journal of Propulsion and Power (ISSN 0748-4658); 12; 2; 289-295
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