New, frequency-domain methods for simulating sideband noise in planetary gears
help in evaluating rotating gear mesh forces in a planetary gear
system, component rotation on the full system vibration response and manufacturing variability.
Dynamics equations of planetary gears
are shown as follows where lumped mass methodology is utilized :
In recent years, a few studies have included gyroscopic effect on free vibration of planetary gears
. Lin and Parker  used eigenvalue derivatives to show the effect of carrier rotation on eigenvalue loci.
In addition, the DSS Series features a two-piece shaft that isolates the planetary gears
from the pushing, pulling and bending forces, without increasing the load on the bearings.
Parker, who is recognized as an expert on the vibration of high-speed power transmissions such as geared and belt-pulley systems, recently received the 2015 Doak Prize from the Journal of Sound and Vibration for his research on instabilities in high-speed planetary gears
inside airplane engines.
Partnered with the world's foremost gear manufacturers, Centa says it creates solutions that may integrate precision face gears, planetary gears
and high precision robotic drives and speed reducers.
He told a fatal accident inquiry in Aberdeen that he became convinced the aircraft crashed because of a fatigue crack on one of the planetary gears
Fix the inner ring of the first-stage planetary gear
train, and take the number of planetary gears
of the planetary gear
train as 3; namely, 1N = 2N = 3.
That gives the oil time to run back from the planetary gears
into the hub so you can get an accurate reading in the sight glass.