Viscoelastic FM mass damper for cable-stayed vibration suppression

Abstract

A viscoelastic frequency modulation mass damper for stay cable vibration suppression is a device used for vibration suppression of stay cables of long-span bridges or transmission lines of large spans. energy consumption. The device is mainly composed of variable section spring steel, mass block, viscoelastic damper, steel rod and connecting piece. The up-and-down vibration of the mass blocks on both sides causes the spring steel to undergo reciprocating deformation, thereby causing the viscoelastic damper to dissipate energy and reduce vibration; the concentrated force generated by the mass blocks at both ends with the vibration of the system is superimposed on the connecting piece, which produces a frequency modulation quality for the stay cable. Damper effect, so as to play a vibration reduction effect. The variable-section spring steel used in this patent has a large middle section and gradually becomes smaller toward both ends, which is not only safe and reliable, but also makes the amplitude of the mass blocks at both ends larger during the vibration process, so that the viscoelastic damper has a significant vibration reduction effect. .

Description

technical field [0001] A vibration-suppressing viscoelastic frequency-modulating mass damper for cable-stayed cables is a device used for vibration suppression of cable-stayed cables of long-span bridges or large-span transmission lines. Background technique [0002] The vibration reduction technology that widely exists in long-span bridge stay cables or long-span transmission lines is a very important research field. Under the action of wind force, stay cables in a certain posture are prone to large-amplitude vibrations. The severe vibration will cause cracks in the anchorage area, the cable sleeve will break, reduce the service life of the stay cable, increase the maintenance cost of the bridge and cause greater economic losses, and even cause bridge accidents. In terms of wind-vibration control of stay cables, the current common method is to install dampers on stay cables, such as magnetorheological dampers and friction dampers, to achieve the purpose of vibration reducti...

AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of these dampers is that the damping force cannot be adjusted according to the vibration size, and it is difficult to achieve the ideal vibration reduction effect.

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