| 摘要 |
PURPOSE:To enlarge a damping factor of vibration in a structure as well as to secure a damped vibration effect for a wide range of frequency, by adding mass to the structure, while making controlling force act on between the added mass and the structure according to vibrations in the structure. CONSTITUTION:When external force P acts on a building 1 by way of a wind or the foundation, a vibration is excited to the building 1. Vibro-acceleration in the building 1 is detected by an accelerometer 3, fed to a control unit 5 and given to an actuator 6 via an integrator, a speed signal amplifier and a power amplifier. At this actuator 6, there is produced controlling force in proportion to a roof velocity, between an added mass and the building 1, causing the vibration damping of the building 1 to grow large. Also in an interspace between the building 1 and the added mass 2, a displacement meter 4 detecting a relative displacement is installed, emitting a relative displacement signal, through which the actuator 6 is energized and the controlling force proportional to the relative displacement is produced. |
