Device for restraining vibration of structural body

Abstract

Abstract PURPOSE:To effectively and accurately restrain the vibrative disturbance from a ground regardless of the changes in the vibration characteristics with the lapse of time, by utilizing the inertial force of an attached weight to actively damp the vibration through a servomechanism which responds to only a component of the vibration of a structural body. CONSTITUTION:A vibration sensor 7 detects the sum of the horizontal accelerations of a structural body 1 and a ground 2. Another vibration sensor 8 detects only the horizontal acceleration of the ground 2. Only the horizontal acceleration of the structural body 1 is obtained by a subtraction circuit 9 and applied to a control circuit 6, which supplies a dynamoelectric actuator 4 with an electrical current corresponding to the vibration of the structural body 1. The actuator 4 drives an attached weight 3. At that time, a driving force is caused as a reaction to the static part of the actuator 4 so that a force opposing the vibration is applied to the ceiling 1a of the body 1 through a securing member 5 to damp and restrain the vibration of the body. Such a closed-loop servomechanism is not affected by the time-lapse changes of the vibration system.

Inventors

• 👤 Yoshio Furuishi
• 👤 古石　喜郎
• 👤 Yoshihisa Kitora
• 👤 木藤良　善久

Bibliographic Details