Patent ID: 6938515

Claim:
A device for reducing rotationally induced bending vibrations comprising: a rotating cylinder having a cylinder barrel with a barrel length; an axis of rotation of said rotating cylinder, and extending in a direction of said barrel length, said cylinder being rotatable about said cylinder axis of rotation; a circumferential surface area of said rotating cylinder barrel; a plurality of actuators arranged in said rotating cylinder beneath said circumferential surface of said cylinder barrel and offset within said rotating cylinder from said axis of rotation, said plurality of actuators each having an actuator length in a direction of said axis of rotation of said rotating cylinder, said barrel length being substantially greater than said actuator length; and means for varying said actuator length of each of said plurality of actuators during rotation of said rotating cylinder as a function of a rotation position of each of said plurality of actuators in said rotating cylinder, said actuator length of each of said plurality of actuators being increased and decreased during each rotation of said rotating cylinder.