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The system consists of a Motor which rotates an eccentric shaft. There is a rubber flexible element which connects from this eccentric shaft to the Conveyor Trough. This element has a spring constant of K1, a damping factor b1 (proportional to velocity only) and the centers on the Eccentric are distance E apart. To keep the conveyor oscillating we have a series of springs and dampers connected between the conveyor trough and the rigid floor. Call these Ks & bs respectively.

Question #1 - Is the natural frequency of this system = sqrt ((K1+Ks)/m) ?

Question #2 - My Textbook on Vibration and Waves gives equations for forced oscillations with damping based on a driving force of Fo cos (omega t). What would Fo be in this example?

The equation I used for amplitude was:

A(omega) = Fo/((k R ((1/R-R)^2+ 1/Q^2)

where R = frequency/natural frequency & Q is the Quality Factor = nat freq*m/bs

For Fo I used K1 * Eccentric c/c

Question #3 - The amplitude equation above neglects damping between the eccentric drive and the mass. What would be the equation with that included?

(I could fit the curve perfectly without this damping)

Question #4 - The equation I have for power required is based on Fo.

P (omega) = Fo^2 * nat freq / (2 k Q sqrt((1/R-R)^2 +1/Q^2)

Is there another equation that would include the damping between the driver and the eccentric shaft?

Thanks for all your help. I am willing to do more research so if you can point me to some literature that would help.