A ferrofluid-based tuned mass damper with magnetic spring

Article type: Research Article

Authors: Wang, Siqi^a; | Liu, Yongkai^a | Li, Decai^a | He, Xinzhi^a

Affiliations: [a] School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China

Correspondence: [*] Corresponding author: Siqi Wang, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China. E-mail: sqwang@bjtu.edu.cn

Abstract: This paper proposes a ferrofluid-based tuned mass damper with magnetic spring that is capable of absorbing the low-frequency vibration energy. The characterization and performance of the tuned mass damper are studied in theory and experiment. Ferrofluid is adhered on the moving permanent magnet and used as self-sustained viscous lubricant to reduce the mechanical damping between the permanent magnet and the inner wall of plastic tube and improve the ability of the vibration pick-up system. A magnetic spring is formed by magnetic repulsive force between the fixed and the moving permanent magnets along the horizontal axis. The tuned mass damper can effectively reduce the low frequency vibration of the rod. And the damping time in the cases of released permanent magnet is 1/6 times as long as that in the cases of blocked permanent magnet. The compact tuned mass damper with adjustable damping and stiffness is suitable to various low frequency vibrations in nature.

Keywords: Ferrofluid, magnetic spring, damper, vibration

DOI: 10.3233/JAE-180056

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. 1, pp. 13-19, 2019