Patent ID: 6874748

Claim:
An active vibration control system for damping vibrations of a floor system or other structure, said system comprising: a) a sensor capable of producing an output proportional to vibration velocity; b) a feedback controller; and c) a proof-mass actuator comprising a linear motor, a moving mass, a linear spring, and a damping mechanism; wherein the properties of the actuator and feedback controller are predetermined such that the system operates without possibility of damage to the system components by exceeding the stroke limitation of the motor or other components; and wherein the following relationship holds: 1 - 4 ⁢ ⁢ β 2 ⁢ ( 1 - β 2 ) ≤ k a ⁢ X max F in ⁢ ⁢ max where β=damping ratio for the actuator (linear damping constant/critical damping); k a =linear spring stiffness; X max =maximum stroke of the actuator (half of the total stroke of the actuator); and F inmax =force limit set by the clipping circuit in the controller.