Gear noise, vibration, and diagnostic studies at NASA Lewis Research Center [PDF]
The NASA Lewis Research Center and the U.S. Army Aviation Systems Command are involved in a joint research program to advance the technology of rotorcraft transmissions.
Coy, John J. +3 more
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Epicyclic Gear Trains: Analysis, Synthesis and Applications [PDF]
Journal of Mechanisms, Transmissions, and Automation in Design, 1983 Herbert W. Muller, Robert J. Willis
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Experimental and analytical evaluation of efficiency of helicopter planetary stage [PDF]
The efficiency of a helicopter transmission planetary stage was studied both experimentally and analytically. Experiments were done by using a back-to-back, test-and-slave arrangement.
Krantz, Timothy L.
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Functional Brain Network Analysis of Knowledge Transfer While Engineering Problem-Solving. [PDF]
Front Hum Neurosci, 2021 Wang F, Jiang Z, Li X, Bu L, Ji Y.
europepmc +1 more source
Vibration in Planetary Gear Systems with Unequal Planet Stiffnesses [PDF]
An algorithm suitable for a minicomputer was developed for finding the natural frequencies and mode shapes of a planetary gear system which has unequal stiffnesses between the Sun/planet and planet/ring gear meshes.
August, R., Frater, J. L., Oswald, F. B.
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Design study of Self-Alining Bearingless Planetary (SABP) gear [PDF]
The feasibility of using the self alining, bearingless planetary (SABP) transmission in an uprated version of the OH-58 helicopter was evaluated, specific performance comparisons of this new transmission with contemporary helicopter transmission systems ...
Folenta, D. J.
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On the danger of redundancies in some aerospace mechanisms [PDF]
An attempt is made to show that redundancies in some aerospace mechanisms do not generally improve the odds for success. Some of these redundancies may even be the very cause for failure of the system. To illustrate this fallacy, two designs based on the
Chew, M.
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Angular Velocity Analysis of an Epicyclic Gear Train Using Fundamental Circuits and a Block Diagram [PDF]
, 2017 The prediction of angular velocity is a prerequisite to investigate the power flow and mechanical efficiency of an epicyclic gear train. This paper presents a useful tool, which combines the fundamental circuit and a block diagram, to analyze the angular
Tsai, Mi-Ching, Wu, Yi-Chang
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A ~4.6 h quasi-periodic oscillation in the BL Lacertae PKS 2155-304?
, 2009 We report a possible detection of an ~4.6-hour quasi-periodic oscillation (QPO) in the 0.3-10 keV emission of the high-energy peaked blazar PKS 2155-304 from a 64 ks observation by the XMM-Newton EPIC/pn detector. We identify a total modulation of ~5% in
A. C. Gupta +51 more
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Design, manufacture and spin test of high contact ratio helicopter transmission utilizing Self-Aligning Bearingless Planetary (SABP) [PDF]
A 450 hp high ratio Self-Aligning Bearingless Planetary (SABP) for a helicopter application was designed, manufactured, and spin tested under NASA contract NAS3-24539.
Folenta, Dezi, Lebo, William
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