Patent ID: 6857231

Claim:
A propeller-controlled active tuned-liquid-column damper comprising: a) a U-shaped vessel having a horizontal portion and two vertical portions protruding upwardly from opposing ends of the horizontal portion, the U-shaped vessel containing a fluid; b) a servo-motor; c) at least one propeller located in the horizontal portion of the U-shaped vessel; d) a gear-shaft unit connected to the servo-motor and the at least one propeller; and e) a computer control system measuring a structural vibration and controlling the servo-motor and the at least one propeller, wherein, when the structural vibration is below a predetermined level, the computer control system stops the servo-motor and the at least one propeller is held in a stationary position, and, when the structural vibration is above a predetermined level, the computer control system starts the servo-motor and the at least one propeller is rotated.