Results 181 to 190 of about 8,052 (227)

Development of a Magnetic Planetary Gearbox

IEEE Transactions on Magnetics, 2008
In this paper, we describe a new design for a magnetic planetary gearbox. We discuss the theory of operation and a simulated design. We constructed and verified the simulation by measuring the transmitted torque and cogging torque. A magnetic planetary gearbox operates like a mechanical planetary gearbox, except that it is contact-free and needs no ...
null Cheng-Chi Huang, null Mi-Ching Tsai, D.G. Dorrell, null Bor-Jeng Lin   +3 more
openaire   +1 more source

Gearbox Planetary Bearing Cage Failure Analysis

Proceedings of the Vertical Flight Society 75th Annual Forum, 2019
There is a constant push within the rotorcraft community to increase performance while simultaneously reducing weight in all systems. For rolling element bearings, this translates to a demand for alternative materials with lower density and improved mechanical properties.
Joshua Fitzgerald, Bryan Allison, Tom Lunz, Matthew Misiaszek   +3 more
openaire   +1 more source

Hybrid Diagnostics and Prognostics of Planetary Gearboxes

2021
The effective condition monitoring of planetary gearboxes is important for making informed maintenance decisions and minimizing machine downtime. Traditional physics-based and data-driven approaches for condition monitoring of planetary gearboxes have inherent shortcomings that limit their practical application for remaining useful life prediction ...
Douw G. Marx, P. Stephan Heyns, Stephan Schmidt   +2 more
openaire   +1 more source

Effect of Redundant Rollers in Planetary Gearbox

Mechanism and Machine Theory
Mechanical transmission losses account for a significant portion of energy dissipation in electromechanical actuators. These actuators generally use a combination of high-speed electrical motors with a high-ratio gearbox. For such high-ratio gear transmission, even minor deviations in meshing can lead to substantial power loss.
Anand Varadharajan, Pablo López García, Stein Crispel, Dirk Lefeber, Tom Verstraten   +4 more
openaire   +1 more source

Vibration signature analysis of commodity planetary gearboxes

Mechanical Systems and Signal Processing, 2019
Abstract Planetary gearboxes excite highly modulated vibration. From the existing literature, contradicting descriptions can be obtained. In order to resolve this situation, six commodity gearboxes are investigated on a test rig. A simple, yet powerful method to extract their vibration signatures is proposed.
Daniel Fritz Plöger, Philipp Zech, Stephan Rinderknecht   +2 more
openaire   +1 more source

Impact of Shaft Misalignments in Planetary Gearboxes

Volume 11: 2023 International Power Transmission and Gearing Conference (PTG), 2023
Abstract Planetary gear sets have a more complex structure than layshaft gearboxes which leads to challenges in design, analysis and operation. In this paper, design critical phenomena in planetary gear sets are addressed and latest test bench findings are presented. These focus on the impact of carrier shaft and planet pin misalignments
Marius Fuerst, Michael Otto, Karsten Stahl   +2 more
openaire   +1 more source

Dependence analysis of planetary gearbox vibration marginals

2016 Prognostics and System Health Management Conference (PHM-Chengdu), 2016
Time-frequency distribution (TFD) methods have been widely used for planetary gearbox fault detection. The aim of TFD is to represent a signal by a joint energy distribution in the time-frequency domain. Positivity is one of the most important properties for TFDs.
Libin Liu, Ming J. Zuo, Xihui Liang
openaire   +1 more source

Optimization of Planetary Gearbox Using NSGA-II

2021
In this study, optimization of planetary gearbox considering regular mechanical and critical tribological constraints such as wear and scuffing is done. The design variables considered are the number of teeth in the sun, planet, ring gear, module, face width, diameter of shafts, planet pin diameter, the hardness of gear material and kinematic viscosity
Abhishek Parmar, P. Ramkumar, K. Shankar
openaire   +1 more source

Unconventional Gear Profiles in Planetary Gearboxes

2023
The power loss of high ratio planetary gear trains (PGTs) is mainly constrained by the meshing efficiency of acting gears in each stage. Such gear wheels, predominantly with involute teeth profiles, work with a meshing efficiency of around 99%. When these gears are used in PGTs with reduction ratios of several hundred to one (500:1), despite their ...
Varadharajan, Anand, Lopez Garcia, Pablo, Crispel, Stein, Vanderborght, Bram, Lefeber, Dirk, Verstraten, Tom   +5 more
openaire   +1 more source

Health Index Development for Planetary Gearboxes

2020
Planetary gearboxes are widely used in machineries such as wind turbines and helicopters. To maximize their effectiveness over their lifecycle, condition monitoring is often used, and proper health indexes can be developed utilizing condition monitoring data.
openaire   +1 more source