| 摘要 |
PURPOSE:To cope with variation in natural frequency of a vibrating system by installing the base end of a pendulum the supporting point of which is movingly adjustable, to said vibrating system while providing a weight and a damper on its free end. CONSTITUTION:A pendulum 4 is vibratively suspended from the upper part of a main vibrating system 1 provided on a base 2, via a bearing 3. A weight 5 is installed on the bottom end of the pendulum 4 and a damper 6 is connected to the weight 5 to damp on its vibration. A supporting structure 7 for supporting the pendulum 4 halfway of the length is provided on the base 2. And an adjusting mechanism 8 for vertically movingly adjusting a supporting point for supporting the pendulum 4 is provided on the upper part of the supporting structure 7. A supporting part 10a for supporting a rod 9 is provided on the inner periphery of the adjusting mechanism 8 and by rotating a slider 10 having thread on its outer periphery by means of a motor 12 via a gear 11, the supporting part 10a can be vertically moved. |
