Low-frequency lever type tuned mass damper

Abstract

The invention discloses a low-frequency lever type tuned mass damper. The damper comprises a lever frame (1) which comprises a lever support (11) and a lever suspension arm (12), a fixing mechanism (6) vertically connected with the lever frame (1) and internally provided a spring assembly (2) and a damper body (5); and a mass unit (3) arranged at the end, far away from the fixing mechanism (6), ofthe lever cantilever (12). The mass unit (3) is movably connected with the lever cantilever (12) through a bearing (4), the mass unit (3) and the lever cantilever (12) form a tuned mass damper powerand power arm, and the spring assembly (2), the damper body (5) and the part between the lever cantilever (12) and the lever support (11) form a resistance and resistance arm. The mass unit (3) comprises a mass block (31). According to the tuned mass damper, the main structure can be effectively prevented from being damaged due to large-amplitude vibration, and then the main structure is protectedagainst damage.

Description

technical field [0001] The invention relates to the technical field of mass dampers, in particular to a low-frequency lever-type tuned mass damper. Background technique [0002] Tuned Mass Damper (TMD) is widely used in the vibration control of bridge structures because of its clear principle and simple structure, especially for the vortex-induced vibration control of long-span bridges caused by wind vibration. At present, the main control frequency of TMD is generally greater than 0.3HZ, and there are relatively few TMDs for low frequency (less than 0.3HZ) control. The vibration frequency of TMD is directly related to the performance of the whole device. Generally, the lower the natural vibration frequency of TMD, the longer the vibration period, the smaller the stiffness and the larger the stroke. [0003] TMD is generally installed inside the steel box girder. At present, the TMD structure types used for structural vertical vibration reduction mainly include stacking typ...

AI Technical Summary

Problems solved by technology

[0004] Due to the long natural vibration period of the low-frequency TMD, the spring stiffness is small, and the vertical load is large, the design and selection of the spring will be very difficult

The spring with low stiffness will also be difficult to process and install due to its long length, excessive static load compression displacement, and large dynamic stroke, and even instability during use.

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