Results 41 to 50 of about 4,896 (145)
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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NASA helicopter transmission system technology program [PDF]
, 1983 The purpose of the NASA Helicopter Transmission System Technology Program is to improve specific mechanical components and the technology for combining these into advanced drive systems to make helicopters more viable and cost competitive for commerical ...
Zaretsky, E. V.
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Advanced continuously variable transmissions for electric and hybrid vehicles [PDF]
A brief survey of past and present continuously variable transmissions (CVT) which are potentially suitable for application with electric and hybrid vehicles is presented. Discussion of general transmission requirements and benefits attainable with a CVT
Loewenthal, S. H.
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An analytical method to predict efficiency of aircraft gearboxes [PDF]
A spur gear efficiency prediction method previously developed by the authors was extended to include power loss of planetary gearsets. A friction coefficient model was developed for MIL-L-7808 oil based on disc machine data. This combined with the recent
Anderson, N. E. +2 more
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Advanced rotorcraft transmission program [PDF]
The Advanced Rotorcraft Transmission (ART) program is an Army-funded, joint Army/NASA program to develop and demonstrate lightweight, quiet, durable drivetrain systems for next generation rotorcraft.
Bill, Robert C.
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Gear tooth stress measurements of two helicopter planetary stages [PDF]
Two versions of the planetary reduction stages from U.S. Army OH-58 helicopter main rotor transmissions were tested at NASA Lewis. One sequential and one nonsequential planetary were tested.
Krantz, Timothy L.
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Results of NASA/Army transmission research [PDF]
Since 1970 the NASA Lewis Research Center and the U.S. Army Aviation Systems Command have shared an interest in advancing the technology for helicopter propulsion systems. In particular, that portion of the program that applies to the drive train and its
Coe, Harold H. +2 more
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Dynamic modeling and analysis of the rotor-stator coupling system of a coaxial contra-rotating gearbox. [PDF]
Sci Rep, 2023 Zhang D, Cui J, Zhu R, Li M.
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Transmission research activities at NASA Lewis Research Center [PDF]
A joint research program, to advance the technology of rotorcraft transmissions, consists of analytical and experimental efforts to achieve the overall goals of reducing transmission weight and noise, while increasing life and reliability.
Lewicki, D. G.
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Study on nonlinear dynamics characteristics of dual speed dual clutch transmission system based on bond graph. [PDF]
Heliyon, 2023 Wu J, Yan H, Liu S, Ni.
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