A frequency continuously adjustable mass damper

Abstract

The invention belongs to the technical field of civil engineering structure vibration damping and provides a frequency continuously adjustable mass damper. The frequency continuously adjustable mass damper is mainly composed of stand columns, a weight box, weight steel plates, a cross beam, a bottom plate, pressing plates and the like. The frequency continuously adjustable mass damper is suitable for controlling high-frequency vibration in large-span sky bridges, port piers and large-span building structures. Compared with a traditional tuned mass damper, the cross beam is adopted to replace springs to provide rigidity of a damping system and reduce the high-frequency vibration. The stand columns are connected with the bottom plate and the pressing plates in a clamping mode, the mounting positions of the stand columns can be adjusted in the length direction of the cross beam, and then the span of the cross beam can be changed. The frequency of the damping system can be continuously adjusted by adjusting the span of the cross beam. The weight steel plates are vertically assembled and connected so that the mounting space can be reduced; meanwhile, the frequency of the damping system can be slightly adjusted by changing the number of the weight steel plates.

Description

technical field [0001] The invention belongs to the technical field of vibration reduction of civil engineering structures, and relates to a frequency continuously adjustable mass damper composed of a column, a counterweight box, a counterweight steel plate, a beam, a bottom plate and a pressure plate. Background technique [0002] A tuned mass damper (TMD for short) is a classic vibration control device, which is usually a vibration system composed of a spring, a damper and a mass. However, the tuned mass damper is a frequency-sensitive damping device, and there are the following problems in actual production: (1) The current tuned mass damper is usually provided by a spring, which is limited by the manufacturing process. The rigidity is difficult to produce accurately, which makes it difficult to guarantee the frequency of the damping system; (2) the current tuned mass damper usually changes the frequency of the system by changing the mass of the counterweight after the sp...

AI Technical Summary

Problems solved by technology

However, the tuned mass damper is a frequency-sensitive damping device, and there are the following problems in actual production: (1) The current tuned mass damper is usually provided by a spring, which is limited by the manufacturing process. The rigidity is difficult to produce accurately, which makes it difficult to guarantee the frequency of the damping system; (2) the current tuned mass damper usually changes the frequency of the system by changing the mass of the counterweight after the spring is manufactured. The tuning range is very limited; (3) The current tuned mass damper is only suitable for vibration reduction under low-frequency excitation, and the traditional tuned mass damper cannot be applied to high-frequency vibrations caused by mechanical equipment, etc.

Due to the widespread use of long-span floor slabs and overhanging structures, there are more and more problems of excessive comfort caused by pedestrian loads or mechanical vibrations. Traditional tuned mass dampers can no longer solve such vibration problems.

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