Optimum design of an eddy current damper considering the magnetic congregation effect
- 26 November 2019
- journal article
- research article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 53 (11), 115002
- https://doi.org/10.1088/1361-6463/ab5bbb
Abstract
When permanent magnets are surrounded by ferromagnetic materials, the magnetic field lines are rerouted in the air gap between them, which provides an available approach for the optimum design of the eddy current damper. Targeted at improving the conventional tubular eddy current damper design, an enhanced eddy current damper (EECD) with a ferromagnetic shaft and a ferromagnetic layer is successfully developed in this study, which is passive, cost-efficient and reliable, significantly boosting the damping effect without occupying extra space. To explore the benefits of the ferromagnetic material, analytical models of the magnetic field distributions are derived for estimating the damping coefficient. In addition, the ferromagnetic material configuration and dimensions of the proposed eddy current damper are optimized for a better performance in vibration suppression. Experiment results agree reasonably well with the theoretical models and finite element predictions, and demonstrate the effectiveness and efficiency of this innovative design, which realizing a remarkable improvement of the damping coefficient from 70.5 N•s/m to 143.2N•s/m.Keywords
Funding Information
- Science and Technology Commission of Shanghai (16441909400, 17DZ1205000, 19YF1416200)
- Shanghai Rising Star Program (17QA1401500, 17ZR1410200)
- National Natural Science Foundation of China (51575329, 61625304, 61873157)
- Program of Young Eastern Scholar of Shanghai (GD2016031)
- Foundation of the State Key Lab of Digital Manufacturing Equipment and Technology (DMETKF2016001, DMETKF2016012)
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