Permanent-magnet type eddy current tuned mass damper

Abstract

The invention relates to a permanent-magnet type eddy current tuned mass damper which comprises a steel magnetic-conducting baseplate (10), wherein end plates (3) are respectively arranged at two ends of the baseplate (10). The permanent-magnet type eddy current tuned mass damper is characterized by also comprising a circular shaft (4) and a linear bearing seat (5), wherein two ends of the circular shaft (4) are respectively arranged on the corresponding end plates (3), and the linear bearing seat (5) is sleeved on the circular shaft (4) and can slide on the circular shaft (4); the lower part of the bearing seat (5) is connected with a mass block (6), and two ends of the mass block (6) are respectively connected with the corresponding end plates (3) through spiral springs (7); the lower part of the mass block (6) is connected with a permanent magnet (13), and a copper plate (12) is arranged below the permanent magnet (13) and connected with the baseplate (12) through a cushion block (11). By adopting an eddy current damping model with special design, the permanent-magnet type eddy current tuned mass damper realizes the damping adjustability of the damper in a larger range, realizes the complete separation between the system rigidity and the damper, and cancels the mechanical friction energy consumption and stress concentration elements, thereby avoiding the common TMD damage failure.

Description

technical field [0001] The invention relates to a tuned mass damper using eddy current as a damping element, which is particularly suitable for the wind vibration control of bridge rigid suspenders and the vibration control of towering structures such as transmission towers. Background technique [0002] In recent years, long-span arch bridges and steel truss arch bridges built in my country have used a large number of slender upright rods as rigid suspenders and truss straight rods. The common cross-section type of open rods is H type, and the common cross-section type of closed box is a rectangle. In recent years, among the large steel arch bridges designed and built in my country, at least two of them suffered from severe wind-induced vibration of suspenders, and caused serious damage, which resulted in cracking of suspender flanges due to torsion. [0003] Transmission towers are prone to large-scale vibration and collapse damage under the action of natural disasters suc...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a permanent magnet eddy current tuned mass damper for the problem of difficult adjustment of damping existing in the existing TMD technology, so that the stiffness and damping of the system are completely separated, and the damping is caused by eddy current energy consumption It can be adjusted flexibly and has a large adjustable range; the linear ball bearing with minimal friction is used to suspend the mass to reduce mechanical friction, and the structural friction damping of TMD is less than 1% to improve the damping ratio of eddy current adjustment Range; not only the damping ratio can be easily adjusted within a wide range of 1% to 20%, but also the sensitivity, reliability and service life of TMD are improved

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