新型竖向电涡流-磁力混合阻尼装置试验研究

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摘要针对大跨轻质结构的减振需要，研制了一种新型竖向电涡流-磁力混合阻尼器样机。首先介绍混合阻尼器的减振原理及振动方程；接着介绍了三种不同的磁路设计和制作过程；随后对样机进行试验，测量其动力参数和减振性能。结果表明，在铜板后方和底板上方安装磁铁均能改变阻尼器的附加刚度；特定磁路设计减少电涡流阻尼系数，增大等效磁力阻尼系数和负刚度。其中对结构模型安装电涡流阻尼器的位移减振率可达89.2%，同等工况下安装三种电涡流-磁力阻尼器的位移减振率分别可达92.5%，94.8%和95.9%。当激励幅值增大，电涡流-磁力阻尼器对结构的控制效果比电涡流阻尼器具有更强的鲁棒性。本研究对土木工程领域中磁力减振的应用及发展，具有借鉴意义。

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关键词 ：电涡流-磁力阻尼器, 磁路设计, 减振率, 负刚度

Abstract：A new type of vertical eddy current magnetic hybrid damper is developed for the vibration reduction of long-span lightweight structures. Firstly, the vibration reduction principle and vibration equation of the hybrid damper are introduced; then, the design and manufacture process of three different magnetic circuits are introduced; then, the prototype is tested to measure its dynamic parameters and vibration reduction performance. The results show that the geometric stiffness of the damper can be changed by installing magnets behind the copper plate and above the bottom plate; the specific magnetic circuit design reduces the eddy current damping coefficient, and increases the equivalent magnetic damping coefficient and negative stiffness. Among them, the vibration reduction rate of the eddy current damper on the structural model can reach 89.9%, and the vibration reduction rate of the three kinds of eddy current magnetic dampers can reach 92.5%, 94.8% and 95.9%, respectively. When the excitation amplitude increases, the control effect of eddy current magnetic damper is stronger than that of eddy current damper. This study has reference significance for the application and development of magnetic vibration reduction in civil engineering.

Key words： Eddy current magnetic damper magnetic circuit design damping ratio negative stiffness

收稿日期: 2020-10-29 出版日期: 2022-02-15

引用本文:

朱前坤,马齐飞,张琼,杜永峰. 新型竖向电涡流-磁力混合阻尼装置试验研究[J]. 振动与冲击, 2022, 41(3): 62-72.
ZHU Qiankun, MA Qifei, ZHANG Qiong, DU Yongfeng. Test of a new vertical eddy current magnetic hybrid damping device. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(3): 62-72.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I3/62

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