Adjustable ultralow-frequency vertical eddy current tuned mass damper (TMD)

Abstract

The invention discloses an adjustable ultralow-frequency vertical eddy current tuned mass damper (TMD) and belongs to the technical field of structural vibration control. The ultralow-frequency vertical eddy current TMD comprises a base, a rigid framework, a rigid framework cross beam, a mass block position adjusting rod, a first nut, a second nut, a mass block, a permanent magnet fixed plate, a permanent magnet set, a conductor copper plate, a magnetic conductive steel plate, a first linear guide rail, an inerter-damping system, a coil spring and a second linear guide rail. The actual physical mass of the TMD is reduced by the inerter-damping system, and the problem of net elongation of a spring of an ultralow-frequency vertical eddy current is too large is solved; the device frequency isadjusted continuously by adjusting the distance between the mass block and a fixed reamer; and an eddy current damping technology is adopted, and the device damping is adjusted continuously by adjusting the distance between the permanent magnet set and the conductor copper plate. In addition, the device has the advantages of simple assembly, easy-to-adjust frequency and damping, good durability and the like.

Description

Technical field [0001] The invention belongs to the technical field of structural vibration control, and specifically relates to an adjustable ultra-low frequency vertical eddy current tuned mass damper. Background technique [0002] Tuned mass damper (TMD) is one of the most widely used passive vibration damping devices, which has outstanding vibration control effects on wind-sensitive structures such as super high-rise buildings and long-span bridges. TMD is generally composed of three parts: spring element, damping element and mass element. According to the movement direction of the mass element, it can be divided into horizontal TMD and vertical TMD. The vertical TMD is mainly used to control the vortex-induced vibration and buffeting of long-span bridges. , Floor vibration of industrial plant and pedestrian vibration caused by pedestrians. [0003] [0004] In order to reduce the static elongation of the spring element of the vertical TMD control ultra-low frequency structure...

AI Technical Summary

Problems solved by technology

The patent "a permanent magnet ultra-low frequency vertical tuning mass damper" uses a flexible hinge to convert the linear motion of the counterweight into the high-speed rotation of the inertial flywheel, thereby reducing the actual mass of the breeding block, but the linear motion of the flexible hinge transmission mechanism The conversion efficiency of rotation and rotation motion is low, and only a limited reduction in the static elongation of the spring can be achieved; the patent "a ultra-low frequency liquid mass tuned damper and its design method" uses liquid buoyancy to reduce the net spring elongation of the ultra-low frequency TMD , but the liquid buoyancy will reduce the equivalent mass of the TMD and affect the vibration reduction effect of the TMD; the patent "an adjustable low-frequency vertical vibration reduction tuned mass damper and its working method" uses the viscoelastic vibration damping sheet with a large static stiffness , The characteristics of small dynamic stiffness reduce the static elongation of the TMD elastic element; the patent "a low-frequency vertical vibration-reducing tuned mass damper that can significantly reduce the static elongation of the spring" reduces the TMD spring by connecting springs of different heights The net elongation of the component, but the frequency adjustment of the device is difficult, which will easily lead to the detuning problem of TMD vibration reduction

[0005] On the other hand, TMD is very sensitive to the vibration frequency of the control structure. When the control frequency of the TMD is out of tune with the vibration frequency of the main structure, the vibration damping effect of the TMD will be significantly reduced; in addition, the damping ratio of the TMD will also significantly affect the TMD The damping effect of

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