Results 31 to 40 of about 4,896 (145)
Efficiency testing of a helicopter transmission planetary reduction stage [PDF]
A parametric study of the efficiency of a 310-kW (420-hp) helicopter transmission planetary test section (four planets) was performed. The purpose was to determine the planetary contribution to the overall transmission power loss.
Handschuh, Robert F., Rohn, Douglas A.
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Kinematic analysis of complex gear mechanisms [PDF]
, 2010 This paper presents a general kinematic analysis method for complex gear mechanisms. This approach involves the null-space of the adjacency matrix associated with the graph of the mechanism weighted by complex coecients.
Alazard, Daniel, Penaud, Julie
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Reliability model for planetary gear [PDF]
A reliability model is presented for planetary gear trains in which the ring gear is fixed, the Sun gear is the input, and the planet arm is the output.
Coy, J. J., Paridon, C. A., Savage, M.
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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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An investigation into hybrid power trains for vehicles with regenerative braking [PDF]
, 2007 Imperial Users ...
Diego-Ayala, Ulises, Diego-Ayala, Ulises
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An investigation of control strategies on gearbox damage [PDF]
, 2009 The impact of control on structural elements such as tower and blades have been thoroughly researched and the validity of analysis methods based on aeroelastic simulations is widely accepted.
Crowther, Ashley +4 more
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NASA transmission research and its probable effects on helicopter transmission design [PDF]
Transmissions studied for application to helicopters in addition to the more conventional geared transmissions include hybrid (traction/gear), bearingless planetary, and split torque transmissions. Research is being performed to establish the validity of
Coy, J. J. +2 more
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A high torque capacity eddy current damper used as a rate limiting device for a large solar array deployment mechanism is discussed. The eddy current damper eliminates the problems associated with the outgassing or leaking of damping fluids.
Ellis, R. C., Fink, R. A., Rich, R. W.
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Tools useful for operations and maintenance tasks on the lunar surface were determined and designed. Primary constraints are the lunar environment, the astronaut's space suit and the strength limits of the astronaut on the moon.
Bentz, Karl F. +7 more
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Modeling of Wind Turbine Gearbox Mounting [PDF]
, 2011 In this paper three bushing models are evaluated to find a best practice in modeling the mounting of wind turbine gearboxes. Parameter identification on measurements has been used to determine the bushing parameters for dynamic simulation of a gearbox ...
Michael R. Hansen +2 more
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