| 摘要 |
Disclosed is a dynamic damper which is to absorb building vibrations in any horizontal directions, not restricted to one direction. For example, it comprises an oscillating body (1) which is held to move horizontally, a plurality of ball screw (4) which are arranged perpendicularly to each other with a height difference among them and which have a nut (4b) portion on the side of the oscillating body and a screw shaft (4a) engaging with said nut portion, and motors (6) which reciprocate the oscillating body according to the period of vibration of the building by turning the ball screws. Also, a method is disclosed for detecting malfunction of a dynamic damper which utilizes the correlation Rxy between the acceleration or velocity or displacement of a building. |
