Typical Symptoms: 1x radial (in Vertical and Horizontal directions)
Like eccentric pulleys, Eccentric gears generate strong 1x radial components, especially in the direction parallel to the gear.
They would also generate sidebands of the running speed of the eccentric gear around the GMF (gear mesh frequency). However, harmonics of GMF may also be generated (depends on the severity of the problem). Natural frequency might also be excited.
Time waveform: The waveform will have combination of 1x running speed of input and output shafts plus strong gear mesh vibration modulated by the running speed of the shaft having the eccentric gear.
Phase: Not applicable.