| 摘要 |
The present invention relates to a stiffness-variable dynamic vibration absorber. The objective of the present invention is to provide the stiffness-variable dynamic vibration absorber which can efficiently suppress the vibration acting on a structure by varying the frequency of operation of the dynamic vibration absorber since the position of the tension spring of the dynamic vibration absorber for controlling longitudinal vibration transmitted to the elevator car is designed to be variable by allowing the stiffness acting on the mass body to be changed. To this end, the stiffness-variable dynamic vibration absorber according to the present invention includes a rectangular bottom plate and a pair of side plates, a housing in a semicircle shape with a guide hole formed along the outer circumference which includes a top plate located at the top ends of the pair of side plates, a heavy body installed to enable vertical movement in the housing as a heavy body in a rectangular parallelepiped shape with a constant load, a pair of sliding hooks provided on the upper surface of upper plate so as to be movable along the guide hole of the housing, a tension spring of which both ends are fixed to the lower surface of the respective sliding hook and upper surface of the heavy body and of which stiffness is controlled according to the movement of the sliding hook, and a main spring provided between the upper surface of bottom plate and the lower surfaces of the heavy body which determines the fundamental frequency of the dynamic vibration absorber. |
