A Variable Stiffness Electromagnetic Particle Damper

A particle damper and variable stiffness technology, which is applied in the direction of building types, buildings, building components, etc., can solve problems such as inability to achieve optimization and numerical simulation, difficulty in meeting shock absorption requirements, complex nonlinear characteristics, etc., and facilitate numerical simulation Analysis, dynamic damping effect, avoiding the effect of non-linear characteristics

Active Publication Date: 2021-03-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its complex nonlinear characteristics, we cannot do good optimization and numerical simulation when using it.
In addition, traditional particle dampers are difficult to meet the damping requirements of different amplitudes

Method used

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  • A Variable Stiffness Electromagnetic Particle Damper
  • A Variable Stiffness Electromagnetic Particle Damper
  • A Variable Stiffness Electromagnetic Particle Damper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] An electromagnetic particle damper with variable stiffness, which can be fixed on the top or bottom of the structure to be damped, and its structure is as follows figure 1 , 2 shown. In this embodiment, the size of the fixed box 1 is 1160×1160×600 mm, the thickness of the side wall is 20 mm, the fixed box 1 is placed on the ground, and the top is sealed by the box cover 10 . The size of the outer box 3 is 520×520×540mm, its wall thickness is 20mm, the size of the inner box 11 is 410×410×410mm, its wall thickness is 10mm, the diameter of the cylinder 5 is 400mm, its height is 400mm, its thickness is 10mm. The diameter of the inner particle 6 is taken as 80 mm, and manganese zinc ferrite is used. The outer box 3 is connected to the fixed copper plate 12 on the inner wall of the fixed box 1 through four springs 2 with variable stiffness.

[0028] The inner box 11 is placed in the outer box 3, and is limited and fixed by the limiting device 7. There is a certain gap in ...

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PUM

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Abstract

The invention relates to a variable-rigidity electromagnetic particle damper. The variable-rigidity electromagnetic particle damper comprises a fixed box (1), a particle box slidably connected in thefixed box (1) and particles (6) installed in the particle box. The particle box comprises an inner box (11) and an outer box (3). An outer surface of the outer box (3) is winded by a coil (4). The particles (6) adopt an easily-magnetized and easily-demagnetized soft magnetic material. An outer side face of the outer box (3) is connected with an inner surface of the fixed box (1) through a spring (2). Compared with the prior art, the variable-rigidity electromagnetic particle damper is capable of, while a vibrating level is overlarge, applying an electric current through the coil orthogonally arranged on the upper face of the inner box, generating a magnetic field, enabling a direction of the magnetic field to be opposite to a direction of a maximum acceleration of the outer box, and through magnetizing the particles, enabling the particles to be moved towards a certain direction as a whole, thereby realizing maximum damping efficacy.

Description

technical field [0001] The invention relates to the field of vibration control of civil engineering structures, in particular to an electromagnetic particle damper with variable stiffness. Background technique [0002] Strong earthquakes and hurricanes have been threatening human existence and bringing disasters to people. With the acceleration of economic development and urbanization, civil engineering structures are developing towards higher heights, larger spans, and more complex structures. As a result, once strong earthquakes and hurricanes come, it may bring more serious problems. socioeconomic losses. Therefore, to minimize the losses caused by earthquake disasters and wind disasters is an important problem that human beings must solve. In order to ensure the safety of the engineering structure and the coordination with the building, the environment and the use requirements, the structural vibration control technology, as a safe, economical and effective measure, ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04H9/02E04B1/98
CPCE04H9/02E04H9/021
Inventor 鲁正马晨智马乃寅
Owner TONGJI UNIV
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