Tuning type magnetic liquid rolling ball damper

Abstract

The invention discloses a tuning type magnetic liquid rolling ball damper. The tuning type magnetic liquid rolling ball damper comprises a cylindrical container with a hemispheric groove therein, a cylindrical solenoid coil, a horizontal base, a hollow rolling ball and kerosene based magnetic liquid, wherein the cylindrical solenoid coil is uniformly wound on the housing wall surface of the cylindrical container; the cylindrical container is positioned on the upper surface of the horizontal base; the kerosene based magnetic liquid is filled inside the hollow rolling ball; and the hollow rolling ball is arranged in the hemispheric groove in the cylindrical container; the kerosene based magnetic liquid is kerosene based Fe3O4 magnetic liquid, and the volume of the kerosene based magnetic liquid is 1 / 4-3 / 4 the inner volume of a ball shell. The tuning type magnetic liquid rolling ball damper has the advantages of being simple in structure, low in cost, easy in control, and wide in workingfrequency band.

Description

technical field [0001] The invention relates to a damper, in particular to a tuned magnetic liquid rolling ball damper. Background technique [0002] Tuned dampers are widely used in various high-rise structures. As a towering structure, the wind power tower has the characteristics of slender, high flexibility, low rigidity, and easy fatigue. During work, it will cause vibration due to factors such as wind-induced loads, earthquake loads, and power system disturbances. Vibration affects the life of wind turbines. one of the important factors. Due to vibration problems, there will be broken lines on the blades of the unit, excessive vibration amplitude of the nacelle, tower instability, generator failure and other phenomena, resulting in the failure of the wind turbine to work normally, and may even cause tower collapse accidents, resulting in heavy losses. Therefore, the research on vibration control of wind power tower has important theoretical significance and engineerin...

AI Technical Summary

Problems solved by technology

These dampers usually change the elastic coefficient of the spring and the quality of the mass block, or change the depth and viscosity of the liquid to adjust the natural shaking frequency of the damper and change the resonance characteristics of the entire structure, so as to achieve the effect of tuning damping and vibration reduction; Most of these dampers have obvious effect on the natural frequency of the first vibration mode of the structure, and the vibration reduction frequency band is narrow; when the external load disturbance is complex, the vibration reduction effect is obviously reduced, and the controllability is poor

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