Low-frequency vertical tuned mass damper with negative stiffness nonlinear energy trap

Abstract

The invention discloses a low-frequency vertical tuned mass damper with a negative stiffness nonlinear energy trap, and belongs to the technical field of structural vibration control. The tuned mass damper comprises a bottom plate, a thrust bearing, a spiral spring, a ball screw, a ball nut, a mass block, a moving permanent magnet set, a fixed steel plate, a fixed permanent magnet set, a sliding bearing and a copper flywheel. The tuned mass damper has the negative stiffness nonlinear energy trap characteristic by utilizing the nonlinearity of the attraction force between the moving permanent magnet set and the fixed permanent magnet set; the equivalent vibration mass of the tuned mass damper is amplified through a ball screw type inerter mechanism, the vibration reduction effect of the tuned mass damper is improved, and meanwhile the problem that the net elongation of a spring of an ultralow-frequency vertical tuned mass damper is too large is solved. The low-frequency vertical tuned mass damper integrates the advantages of a nonlinear energy trap and a tuned mass damper, and broadens the control frequency band of the tuned mass damper; and meanwhile, the durability of the low-frequency vertical tuned mass damper is improved by adopting an eddy current damping technology.

Description

technical field [0001] The invention belongs to the technical field of structural vibration control, and in particular relates to a low-frequency vertical tuned mass damper with negative stiffness nonlinear energy wells. Background technique [0002] In recent decades, my country's bridge construction has experienced leapfrog development, and a series of kilometer-level bridges across rivers and seas have been built. With the continuous increase of bridge spans, large-span bridges are prone to large-scale vibrations under strong / typhoon, earthquake, vehicle and other loads. The vibration of the bridge will not only cause fatigue damage to the bridge structure, increase the maintenance cost of the bridge, but also reduce the safety and comfort of driving on the bridge, making drivers and public media doubt the safety of the bridge. Therefore, effective bridge vibration reduction technology is crucial to the safe operation of bridges. [0003] As the most widely used passive...

AI Technical Summary

Problems solved by technology

In order to broaden the control frequency of TMD, a new idea is provided. The patent "a tuned mass damper vibration reduction system incorporating a nonlinear energy well" broadens the control frequency band of TMD in the horizontal direction. However, no better vibration reduction performance has been found so far. Negative stiffness nonlinear energy well integrated into TMD related reports

[0006] In addition, when the vertical TMD controls the vertical vibration of a long-span bridge, the TMD will have the problem of excessive static elongation of the spring element. Taking Tokyo Bay Bridge in Japan as an example, the operating frequency of the TMD is 0.33Hz, and the static elongation of the TMD spring element The length will reach 2.27m

The design and installation of springs face great difficulties

In order to solve this problem, the bridge TMD uses a lever mechanism composed of main and auxiliary frame structures to effectively reduce the static compression of the spring (only 0.45m). And other issues

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