I want to know the low frequency effects on power transmission , about losses , power factor, and disturbances

I am assuming you are referring to vibrations.
The overall effect is gear to gear vibrations are low frequency to begin with but there is no stasis the expanding vibrations tend to cause the gears to touch at differing points along the involute space. When a gear touches it is supposed to apply the full turning force along the entire length of the tooth when this does not happen it causes the gear to "bounce" back and forth literally applying equal force forward and backwards through this action. (Think of a quarter spinning down only one point touches and the coin wiggles to a stop while rotating) The bearing surface tolerance of the gears allow this "wiggle action" usually the wiggle is very small and happens when the transmission is not under load.
As above the loss is equal to the power applied IE more power equals more loss (vibration) until the unit comes apart.
To determine the power factor the unit must be under load which would cause vibrations to stop unless the bearing surface has degraded at which point the analysis is useless.
The whole of the disturbances is the vibration.
I hope this helps.

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