Variable-stiffness broadband vibration absorber based on electromagnetic compression

Abstract

The invention relates to a variable-stiffness broadband vibration absorber based on electromagnetic compression. The variable-stiffness broadband vibration absorber comprises an equivalent elastic element 1, a controlled system 2, a vibration absorber shell 3, fixing bolts 4, a cylindrical tapered elastomer 5, a claw-type expanding ring 6, an acceleration sensor 7, a charge amplifier 8, a tapered iron core 9, an electromagnetic coil 10, a vibration absorbing block 11, a controllable DC power source 12 and a controlling system 13, wherein the vibration absorber shell 3 is fixed in the controlled system 2; the cylindrical tapered elastomer 5, the claw-type expanding ring 6, the tapered iron core 9 are sequentially arranged inside the vibration absorber shell 3; the electromagnetic coil 10 is winded around the lower part of the vibration absorber shell 3; the acceleration sensor 7 is arranged in the controlled system 2; the charge amplifier 8 is connected with the acceleration sensor 7 and the controlling system 13; and the controllable DC power source 12 is connected with the controlling system 13 and the electromagnetic coil 10. By adoption of the variable-stiffness broadband vibration absorber provided by the invention, the problem that a conventional vibration absorber is narrow in vibration-reducing frequency band can be solved; the variable-stiffness broadband vibration absorber is simple in structure and high in response speed; and a plentiful supply of external energy is not needed.

Description

technical field [0001] The invention belongs to the field of vibration control, and in particular relates to a variable stiffness broadband vibration absorber based on electromagnetic compression. Background technique [0002] Due to its simple structure, stable performance and good economy, dynamic vibration absorbers have been widely used in the fields of mechanical systems, engineering structures and buildings. The working principle of the dynamic vibration absorber can be simplified as a two-degree-of-freedom vibration system, specifically as figure 1 As shown, the mass and stiffness of the controlled system are respectively m `1 、k 1 , the mass and stiffness of the shock absorber are respectively m 2 、k 2 , the displacement of the controlled system under the action of simple harmonic excitation force f sin(ωt) is x 1 , the vibration absorber displacement is x 2 , it can be seen from the theory of vibration mechanics that the kinematic equation is as formula 1: ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a variable stiffness broadband vibration absorber based on electromagnetic compression, which can effectively solve the problem of narrow vibration frequency band of traditional vibration absorbers, and at the same time has a simple structure, fast response speed, and does not require a large amount of external energy supply

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