Abstract
In this paper, a novel nonlinear magnetic vibration isolator is developed. The developed isolators possess the characteristic of quasi-zero stiffness (QZS). It is obtained by connecting a vertical coil spring with two permanent magnet springs in couple with three permanent magnets. Firstly, the permanent magnet spring is introduced, and approximate expression of repulsive force in the permanent magnet spring is proposed. Secondly, characteristic analysis of system is investigated. It is shown that there is a unique relationship between the stiffness of vertical spring and parameters of system that yields a QZS system. The approximate stiffness of QZS system can be used instead of the analytical stiffness in dynamic analysis.
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