Variable rotary pendulous mass vibration suppression system

A vibration suppression system comprising:

• a vibration control mass having a center of mass;
• a first rotor having a central axis of rotation;
• a second rotor having an axis of rotation coincident with said central axis of rotation;
• a first coupling between said first rotor and said vibration control mass;
• said first coupling having a first coupling center offset perpendicularly from said central axis of rotation a first radial coupling distance;
• a second coupling between said second rotor and said vibration control mass;
• said second coupling having a second coupling center offset perpendicularly from said central axis of rotation a second radial coupling distance;
• said first radial coupling distance being different from said second radial coupling distance;
• said first coupling center offset axially from said center of mass with respect to said central axis of rotation by a first axial coupling distance;
• said second coupling center offset axially from said center of mass with respect to said central axis of rotation by a second axial coupling distance;
• said first axial coupling distance being different from said second axial coupling distance;
• said first and second coupling centers having a selectively variable displacement angle defined by the inclusive angle between a line extending between said central axis of rotation and said first coupling center and a line extending between said central axis of rotation and said second coupling center;
• wherein said first rotor and said second rotor are controllable to produce a vibration control force vector having a controllable magnitude and frequency about said central axis of rotation.