Design of an Innovative Eddy Current Replaceable Coupling Beam and Its Numerical Analysis

doi:10.12141/j.issn.1000-565X.210665

Abstract

Abstract:

This paper carried out a detailed study on the damping characteristics of the eddy current coupling beam damper, which can start to dissipate energy under small deformation of the replaceable coupling beam. Based on the analysis of magnetic circuit theory, the study proposed the optimal arrangement of permanent magnet pole in eddy current damper. In other words, the permanent magnet poles parallel to the direction of conductor motion were arranged alternately, and the permanent magnet poles perpendicular to the direction of conductor motion were arranged in the same direction. In view of this, two kinds of eddy current dampers were designed, one of which is the plate eddy current damper with the conductor plate moving straight in the magnetic field and the other is the rotary eddy current damper with the gear-rack mechanism to amplify the rotation speed of the conductor plate in the magnetic field. Two kinds of eddy current dampers were used in the replaceable coupling beam, and the finite element simulation of the new eddy current coupling beam damper installed on the replaceable coupling beam was carried out, which revealed the nonlinear mechanical behavior of eddy current damping. It shows that the damping coefficient and stiffness coefficient are strongly related to the frequency. The higher the loading frequency, the lower the energy consumption efficiency and the higher the dynamic stiffness of the structure. So, the eddy current damper is more suitable for low frequency working conditions, and at this time, the damping coefficient of the eddy current damper is large, the energy consumption efficiency is high, and the stiffness coefficient is small, which basically does not change the natural vibration characteristics of the structure. Therefore, it is of great value in real-world application.

Key words: electromagnetic damping, replaceable coupling beam, frequency correlation, numerical simulation

CLC Number:

TU352.1

GONG Nan, LI Peizhen, HE Xuming. Design of an Innovative Eddy Current Replaceable Coupling Beam and Its Numerical Analysis[J]. Journal of South China University of Technology(Natural Science Edition), 2022, 50(7): 25-34.

Figures/Tables 15

Fig.1

Fig.2

Fig.3

Fig.4

Table 1

Material parameters"

材料

型号

$σ$ /

（S · m^-1）

μ

B r

T

铜板

T2紫铜

580 000 00

1.0

—

钢板

Q345B钢

2 000 000

见图5

—

永磁体

N50H钕铁硼

625 000

0.85

1.4

Table 1

Fig.5

Table 2

Loading condition of eddy current damper"

加载幅值 $/ m m$	序号	加载频率 $/ H z$
5	I-1	2.0
	I-2	3.0
	I-3	5.0
	I-4	7.5
	I-5	10.0
15	II-1	1.0
	II-2	2.0
	II-3	3.0
	II-4	5.0
	II-5	7.5
30	III-1	0.5
	III-2	1.0
	III-3	2.0
	III-4	3.0
	III-5	5.0

Table 2

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

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