Variable-rigidity and variable-damping tuned mass damper

Abstract

The invention discloses a variable-rigidity and variable-damping tuned mass damper, which is mainly applied to vibration control over multi-frequency structures such as high-rise buildings or long-span bridges, ocean platforms and the like. The tuned mass damper comprises a mass block, wherein a vertical spring is connected to the upside of the mass block in a vertical direction, and magnetorheological dampers are respectively arranged on the mass block in a horizontal direction and a vertical direction; and a cantilever spring is arranged horizontally and longitudinally, one end of the cantilever spring is connected with the mass block, the other end of the cantilever is connected with a traveling mechanism. Two ends of the traveling mechanism are placed on a rigid guide rail, and the traveling is driven by a stepping motor to move longitudinally. The length of the cantilever spring is regulated by the movement of the stepping motor, so that the tuning frequency of the tuned mass damper is further regulated; and by regulating currents of the magnetorheological dampers to change the damping ratio of the tuned mass damper, the rigidity and the damping are regulatable continuously, so that the vibration control in the vertical direction and the horizontal direction. The variable-rigidity and variable-damping tuned mass damper disclosed by the invention has a clear working principle and has the advantages of easiness for realizing semi-active control property, good damping effect, fast response, high precision and the like in engineering application.

Description

technical field [0001] The invention belongs to the technical field of vibration control, in particular to a tuned mass damper with variable stiffness and variable damping mainly used for vibration control of multi-frequency structures such as high-rise buildings or long-span bridges and ocean platforms. Background technique [0002] Tuned mass damper is the most commonly used control device. Its mechanism is to apply the environmental load to the structure and the double tuning principle of the vibration damping device placed on the structure to absorb part of the vibration energy and achieve the effect of vibration reduction. The key to improving the damping effect and efficiency of the tuned mass damper is to determine the optimal tuning frequency and damping ratio. In the vibration control of conventional tuned mass dampers, since their tuning frequency and damping ratio are fixed, it is easy to get out of tune when the external excitation, structural main vibration mod...

AI Technical Summary

Problems solved by technology

In the vibration control of conventional tuned mass dampers, since their tuning frequency and damping ratio are fixed, it is easy to get out of tune when the external excitation, structural main vibration mode and inherent dynamic characteristics change. Even if multiple tuned mass dampers are used, most tuning The mass damper also does not meet the optimal vibration reduction conditions, and the vibration reduction efficiency of the tuned mass damper cannot be fully utilized

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