Design of Gear Drives With High Gear Ratio [PDF]
A three part paper to describe the results of several gear drive types with a high gear ratio is presented. A single stage planetary gear train with double helical gears is described with methods to reduce transmission errors and improve load ...
Fuentes, Alfonso +3 more
core +1 more source
Vibration Separation Methodology Compensated by Time-Varying Transfer Function for Fault Diagnosis of Non-Hunting Tooth Planetary Gearbox. [PDF]
Sensors (Basel), 2022 Tong S, Li J, Cong F, Fu Z, Tong Z.
europepmc +1 more source
Concepts for Multi-Speed Rotorcraft Drive System - Status of Design and Testing at NASA GRC [PDF]
In several studies and on-going developments for advanced rotorcraft, the need for variable/multi-speed capable rotors has been raised. Speed changes of up to 50 percent have been proposed for future rotorcraft to improve vehicle performance.
Handschuh, Robert F. +2 more
core +1 more source
Fault Diagnosis of Planetary Gearbox Based on Dynamic Simulation and Partial Transfer Learning. [PDF]
Biomimetics (Basel), 2023 Song M, Xiong Z, Zhong J, Xiao S, Ren J.
europepmc +1 more source
An Improved Convolutional Capsule Network for Compound Fault Diagnosis of RV Reducers. [PDF]
Sensors (Basel), 2022 Xu Q, Liu C, Yang E, Wang M.
europepmc +1 more source
Technology and benefits of aircraft counter rotation propellers [PDF]
Results are reported of a NASA sponsored analytical investigation into the merits of advanced counter rotation propellers for Mach 0.80 commercial transport application.
Bradley, E. +4 more
core +1 more source
Dynamic characteristics analysis of planetary gear system with internal and external excitation under turbulent wind load. [PDF]
Sci Prog, 2021 Yang H, Li X, Xu J, Yang Z, Chen R.
europepmc +1 more source
Low-noise, high-strength, spiral-bevel gears for helicopter transmissions [PDF]
Improvements in spiral-bevel gear design were investigated to support the Army/NASA Advanced Rotorcraft Transmission program. Program objectives were to reduce weight by 25 percent, reduce noise by 10 dB, and increase life to 5000 hr mean-time-between ...
Handschuh, Robert F. +3 more
core +1 more source
Study on an Assembly Prediction Method of RV Reducer Based on IGWO Algorithm and SVR Model. [PDF]
Sensors (Basel), 2022 Jin S, Cao M, Qian Q, Zhang G, Wang Y.
europepmc +1 more source
Rotorcraft transmissions [PDF]
Highlighted here is that portion of the Lewis Research Center's helicopter propulsion systems program that deals with drive train technology and the related mechanical components.
Coy, John J.
core +1 more source