Eddy current tuned mass damper for multi-stage wind vibration control of upright cantilever structure

Abstract

The invention belongs to the technical field of wind resistance and vibration reduction of engineering structures, and mainly relates to an eddy current tuned mass damper for multi-stage wind vibration control of an upright cantilever structure. The eddy current tuned mass damper comprises at least two eddy current damper assemblies, wherein the eddy current damper assemblies are arranged in the circumferential direction of a main structure. Under the condition that normal use and safety performance of a main body structure are not affected, multi-order dynamic response of the main body structure under the action of wind loads is effectively reduced, so that the probability of fracture and collapse accidents is reduced; through eddy current energy consumption, the rigidity of the damper is provided by steel bars, and the energy consumption damping is provided by eddy current damping force; the eddy current damper assemblies and the main body structure are independently designed, so that the installation is flexible; and the length of the steel bars, the size of magnetic steel, the thickness of copper plates and the distances between the magnetic steel and the copper plates can be adjusted according to the specific main body structure condition, so that the application range is wider.

Description

technical field [0001] The invention belongs to the technical field of wind resistance and vibration reduction of engineering structures, and mainly relates to an eddy current tuned mass damper for multi-order wind vibration control of vertical cantilever structures. Background technique [0002] Upright cantilever structures, such as utility poles, light poles, masts, lightning rods, etc., have a large slenderness ratio and low rigidity, and the overall structure is flexible, and wind loads are likely to cause frequent and strong vibrations of such flexible structures. At the same time, the circular cross-section is more likely to cause the structure to form regular vortex shedding at low wind speeds, and then vortex-induced resonance in the cross-wind direction occurs. This kind of low-stress level reciprocating load reduces the mechanical strength of the entire structure’s joints under long-term action, and even makes the structure in the wind. Cracks or even fractures at...

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Problems solved by technology

[0004] In the prior art, a large number of welding processes are used for the vibration damping device of the vertical cantilever structure, which is inconvenient for installation and construction; a large number of springs are used to provide elastic force, and the spring occupies a large space, which affects the aerodynamic shape of the main structure and increases the mass of the device. The additional impact of strength is large, which restricts the size of the vibration damping device; most of the dampers in the prior art are traditional passive dampers, which can only suppress specific modes, and the suppression frequency is too narrow, so the vibration reduction effect is limited

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