A Low Frequency Vertically Tuned Mass Damper with Negative Stiffness Nonlinear Energy Well

Abstract

The invention discloses a low-frequency vertical tuned mass damper with a negative stiffness nonlinear energy well, which belongs to the technical field of structural vibration control. The tuned mass damper includes a base plate, a thrust bearing, a coil spring, a ball screw, and a ball Nut, mass block, moving permanent magnet group, fixed steel plate, fixed permanent magnet group, sliding bearing and copper flywheel; the present invention utilizes the non-linearity of attraction between the moving permanent magnet group and the fixed permanent magnet group to make the device have a negative Stiffness non-linear energy well features; ball screw inertial mechanism is used to amplify the equivalent vibration mass of the tuned mass damper, while improving the vibration reduction effect of the tuned mass damper, it solves the problem of ultra-low frequency vertical tuned mass damper spring net The problem of excessive elongation; the device combines the advantages of the nonlinear energy well and the tuned mass damper, which broadens the control frequency band of the tuned mass damper; at the same time, the eddy current damping technology is used to improve the durability of the device.

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

Images