Three-way low-frequency variable-rigidity variable-damping tuned mass damper

Abstract

The invention relates to a three-way low-frequency variable-rigidity variable-damping tuned mass damper. The tuned mass damper comprises a shell, a mass block and an air spring, wherein the mass block is hollow inside to form an air chamber; one end of the air spring is fixedly connected with the outer surface of the mass block; the other end is in sliding connection with the inner surface of the shell. Compared to the prior art, the low-frequency variable-rigidity variable-damping tuned mass damper has the advantages of good stability, convenience in mounting and maintenance, good sealing performance, low vibration isolation frequency, space saving and the like.

Description

technical field [0001] The invention relates to a tuned mass damper, in particular to a tuned mass damper with three-way low-frequency variable stiffness and variable damping. Background technique [0002] A tuned mass damper (TMD) is composed of a mass block, a spring and a damping system, that is, through the spring and mass block, its vibration frequency is adjusted to the vicinity of the frequency of the main structure, the resonance characteristics of the structure are changed, and the input vibration energy is dissipated by the damping system. In order to achieve the effect of vibration reduction. [0003] At present, the tuned mass dampers commonly used in the field of engineering structures are generally two types: shelving type and suspension type. Adjust the spring stiffness and mass of the proof mass to tune the frequency. The suspension type is generally a single pendulum structure, and the frequency can be adjusted by adjusting the length of the pendulum and t...

AI Technical Summary

Problems solved by technology

[0004] The natural vibration frequency of TMD composed of steel springs can reach 2-5Hz (vibration reduction range ≥ 6Hz). For many engineering structures with low natural frequency, the vibration reduction effect is not good. The frequency of suspended single pendulum TMD Although it can be made very low in theory, the defects of too long pendulum length and generally only controlling horizontal vibration also limit its application.

[0005] Usually the damping system of TMD is a viscous liquid type or a friction type, and the damping performance is related to speed or displacement. Once the production and installation are in place, the damping performance is fixed and cannot be adjusted.

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