Test of a new vertical eddy current magnetic hybrid damping device

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (3) : 62-72.

ZHU Qiankun, MA Qifei, ZHANG Qiong, DU Yongfeng

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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.

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Eddy current magnetic damper / magnetic circuit design / damping ratio / negative stiffness

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ZHU Qiankun, MA Qifei, ZHANG Qiong, DU Yongfeng. Test of a new vertical eddy current magnetic hybrid damping device[J]. Journal of Vibration and Shock, 2022, 41(3): 62-72

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