| 摘要 |
PURPOSE:To greatly reduce the frictional force which acts to a weight and to simplify the mechanism of a pendulum-type dyamic vibration absorber, by hanging the weight with a plurality of hangers at or near the top of a structural body and providing a damper which acts in the direction of vibration to be controlled. CONSTITUTION:Hangers 3 are attached to a support frame 1 in such a manner that the upper attached points of the hangers are spread on a plane perpendicular to the direction of that vibration of a structural body, which is to be controlled. As a result, the motion of a weight 2 is provided with a directionality. The natural frequency of a pendulum-type dynamic vibration absorber is set by adjusting the length of the hangers 3. The damping coefficient of the absorber is set by adjusting that of an oil damper 5 or by adjusting the lever ratio of a connecting rod 4. Various properties are thus adjusted to achieve optimal vibratory characteristic values against the vibratory characteristic values of the structural body whose vibration is to be restrained, to provide the dynamic absorber with a desired damping force. Since the frictional force in the absorber and its scale are small, the absorber can be used as a vibration restrainer for a main tower being built. |
