The paper puts forward a magnetic fluid damper with simple structure. A dynamic model of magnetic fluid in the damper is built up based on Newton's second law and the continuity equation. The representation of logarithmic decay rate of damper imposing on the back beam of cantilever beam is acquired through the oscillating energy of an elastic cantilever beam. The designed experiments prove that logarithmic decay rate of beam oscillation is influenced by different radius of permanence magnets in dampers, different gap between casing and permanent magnet and magnetic fluid with different saturation magnetization. It is indicated that theory and experimental results are in agreement under the assumed condition. In particular, it is found that the damping effect of magnetic fluid dampers is improved with the increment of radius of permanent magnet within a certain scope, there is an optimal gap between damper casing and permanent magnet, which can make beam oscillation reach the maximum logarithmic decay rate.
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