中文摘要：

设计和制备了中间层为含铁磁颗粒质量比为80％的磁流变弹性体材料，上下表面层为铝合金的磁流变弹性体夹层梁。在局部磁场作用下搭建了磁流变弹性体夹层梁悬臂状态下的振动响应特性测试实验台。实验结果表明，通过在夹层梁水平方向移动永久磁铁，即局部外加磁场由夹层梁的固定端向自由端移动时，其一阶振动频率有逐步减小的趋势。同时，通过沿夹层梁垂直方向移动永久磁铁改变磁场强度的大小，此时夹层梁的一阶振动频率在外加磁场强增大时也呈减小趋势。两组实验均表明在局部磁场控制下能有规律地改变磁流变弹性体夹层梁的一阶振动频率。根据这种变化规律有望设计出频率变化范围更宽的移频装置。

英文摘要：

A magnetorhealogica! elastomer （MRE） with 80% iron mass was manufactured, and the MRE sandwich beam was also fabricated by treating with MRE between two thin aluminum layers. The experiment test rig was set up to investigate the vibration respot~e of the MRE sandwich cantilever beam under non-homogeneous magnetic fields. The experimental results show that the first natural frequency of the MRE sandwich beam decreased as the magnetic field that applied on the beam was moved from the clamped end of the beam to the free end of the beam. It is also obvious that the MRE sandwich hewn had the capabilities of left shifiing first natural frequency when the magnetic field was increased in the specified activation regior~. These experiment tests all show that the first natural frequency can be changed under the control of the non-homogeneory magnetic fields, which provide guidance for the development a frequency controllable device with wide frequency band.