新型电涡流连梁阻尼器设计及其数值模拟分析

宫楠, 李培振, 何徐明

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

华南理工大学学报(自然科学版) >

2022 , Vol. 50 >Issue 7: 25 - 34

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

土木建筑工程

新型电涡流连梁阻尼器设计及其数值模拟分析

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同济大学土木工程防灾国家重点实验室，上海 200092

宫楠（1995-），女，博士生，主要从事工程结构抗震防灾研究。E-mail：gnan@tongji.edu.cn

收稿日期: 2021-10-20

网络出版日期: 2022-01-11

基金资助

国家重点研发计划项目(2018YFC0705602)

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

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State Key Laboratory of Disaster Reduction in Civil Engineering，Tongji University，Shanghai 200092，China

Received date: 2021-10-20

Online published: 2022-01-11

Supported by

the National Key Research and Development Program of China(2018YFC0705602)

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摘要

本文对应用于可更换连梁中的小位移下即可开始耗能的电涡流连梁阻尼器的阻尼特性展开研究。基于磁路理论分析，提出了电涡流阻尼器中最优的永磁体磁极布置方式，即平行导体运动方向交替布置，垂直导体运动方向同向布置。鉴于此，设计了两种新型电涡流阻尼器，一是导体板在磁场中平动的板式电涡流阻尼器，二是利用齿轮-齿条机构放大导体板在磁场中定轴转动速度的旋转式电涡流阻尼器。将两种电涡流阻尼器运用于可更换连梁中，对安装于可更换连梁上的新型电涡流连梁阻尼器进行有限元仿真，揭示了电涡流阻尼的非线性力学行为。其阻尼系数及刚度系数具有较强的频率相关性，加载频率越大，耗能效率越低，结构动刚度越大，因此电涡流阻尼器更加适用于低频的工作条件。此时电涡流阻尼器的阻尼系数大，耗能效率高，且刚度系数较小，基本不会改变结构的自振特性，具有良好的实际工程应用价值。

关键词： 电磁阻尼; 可更换连梁; 频率相关性; 数值模拟

本文引用格式

宫楠, 李培振, 何徐明 . 新型电涡流连梁阻尼器设计及其数值模拟分析[J]. 华南理工大学学报(自然科学版), 2022 , 50(7) : 25 -34 . DOI: 10.12141/j.issn.1000-565X.210665

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

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