초록 ▼

An active vibration control system for controlling excessive or unwanted vibrations in floors or other structures. The system has three main components: (1) velocity sensor w/signal conditioner; (2) feedback controller; and (3) proof-mass actuator. This system works by creating a feedback loop that

An active vibration control system for controlling excessive or unwanted vibrations in floors or other structures. The system has three main components: (1) velocity sensor w/signal conditioner; (2) feedback controller; and (3) proof-mass actuator. This system works by creating a feedback loop that generates a control force proportional to the velocity, thus adding damping to the controlled modes of floor vibration. In other words, the feedback loop makes the moving mass of the actuator move to counteract the motion of the floor. The system is optimized such that the motor can be driven with a sinusoidal force where the peak force is at or near the full motor capacity at any frequency without exceeding the stroke while maintaining a simple and cost effective feedback controller. Additionally, a relationship between the fundamental natural frequency of the floor system and actuator is established to provide efficient and stable control.

대표청구항 ▼

1. 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

1. 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: where β=damping ratio for the actuator (linear damping constant/critical damping); ka=linear spring stiffness; Xmax=maximum stroke of the actuator (half of the total stroke of the actuator); and Finmax=force limit set by the clipping circuit in the controller. 2. The active vibration control system of claim 1 wherein the feedback controller contains a clipping circuit and wherein the force limit set by the clipping circuit is at or near full motor capacity.3. The system of claim 1 wherein Finmax is at or near full motor capacity.4. The system of claim 1 wherein the relationship is approximately equal.5. The system of claim 1 wherein the feedback controller is a controller comprising a signal amplification circuit and a clipping circuit.6. The system of claim 5 wherein the feedback controller additionally comprises a dc offset correcting circuit.7. The system of claim 5 wherein the signal amplification is set at around half the amount which would cause unstable behavior in the system.8. The system of claim 1 wherein the velocity sensor has a lower bandwidth limit such that significant phase distortions are not present at the first natural frequency of the structure to be damped.9. The system of claim 8 wherein the velocity sensor has a lower bandwidth limit that is less than about ½ of the first natural frequency of the structure to be damped.10. The system of claim 1 wherein the phase distortion between Fin and Fout is less than 30 degrees.11. The system of claim 10 wherein the natural frequency of the proof-mass actuator is less than half of the first natural frequency of the floor system when the proof-mass actuator damping is less than 40%.12. The system of claim 1 wherein the actuator damping is between 30 to 40%.13. The system of claim 12 wherein the actuator damping is near 40%.14. The system of claim 1 wherein the actuator additionally contains a linear voltage displacement transducer to electronically control the stiffness characteristics of the proof-mass actuator.