For the problem that ordinary MR damper requires extra field coil and has dependence on energy with large volume and complex structure, a magnetic field structure of passive adaptive MR damper was designed. The magnetic circuit provided magnetic field by permanent magnet and transformed the variation of load force on MR damper into the variation of relative permeability of giant magnetostrictive material based on giant magnetostrictive inverse effect, and thus made magnetic field through the magnetorheological fluid changed. Finite element method was used to verify the correctness of the magnetic circuit. Apply the magnetic structure in passive adaptive MR damper and experiment was done. The result shows that the designed magnetic field structure can change the variation of external force into the variation of magnetic flux density and then change into the variation of damping force. The design of magnetic field meets the requirements of passive adaptive MR damper.%针对常规的磁流变阻尼器需要外加线圈,对能源具有依赖性、体积庞大、结构复杂的问题,设计了无源自适应磁流变阻尼器的磁场结构.该磁路由永磁体提供磁场,利用超磁致伸缩逆效应,把阻尼器受到的负载力的变化转化为超磁致伸缩材料相对磁导率的变化,进而使磁流变液处的磁场发生变化.利用磁场有限元方法验证了磁路的正确性.应用该磁路结构到阻尼器中,并对其进行了实验,结果表明:设计的磁场结构能使外力的变化转化为MRF间隙处磁感应强度的变化,进而转化为阻尼力大小的变化,磁场设计满足要求.
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