【摘要】 针对航天器上长直物体的振动问题,基于磁性液体的二阶浮力原理与液体的粘性耗能原理,提出了一种新结构的磁性液体阻尼减振器。该减振器由非导磁性壳体、永磁体和磁性液体构成,吸附有磁性液体的永磁体作为工作单元,当有振动产生时,工作单元与非导磁性壳体产生相对运动,从而实现摩擦耗能。试验表明对数衰减率随非导磁性壳体长度(177~228 mm)的增加而增大后趋于平稳,且效果明显;对数衰减率随注入磁性液体质量(2~22 g)的增加先增大后趋于平稳并略有下降,且效果不明显。更多还原

【Abstract】 A new type of magnetic fluid damper based on the rule of magnetic fluid’s second-order buoyancy and the rule of the magnetic fluid’s vicious energy dissipation was proposed to solve the vibration problem of the long and straight objects on the spacecraft. The magnetic fluid damper is composed of a non-magnetic shell,three magnets and the magnetic fluid. There will be friction between the working unit which is composed of three magnets with magnetic fluid and the non-magnetic shell when vibration occur due to the relative motion between them. Experimental results showed that the log decrement rate increased with the increase of the length of the non-magnetic shell( increasing between 177 mm to 228 mm),and then became stable. The effect was obvious. Experimental results also showed that the log decrement rate increased with the increase of the length of the mass of the injected liquid( increasing between 2 g to 22 g),then tended to be stable and decreased slightly. The effect was not obvious.更多还原