Vibration absorber for a quadcopter?

[minoroctave]

Homework Statement

I am supposed to examine the effectiveness of a vibration absorber design for a quad copter. Attached is a picture of the quad copter and the design; basically each of the spring dampers would be attached to an arm of the copter.
In the case of a single quad copter arm, what would be the primary system and what would be the absorber system?

Homework Equations

The Attempt at a Solution

I know the absorber system is the spring damper and the base plate. but for the primary system, is it just the arm or should i include the motor and the blades?

 

[Simon Bridge]

How would you normally work it out?
What is is it that you want to stop shaking about?