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中文摘要：
为了掌握交变磁场对基于剪切方式的盘型磁流变（MR）流体阻尼器动力特性的影响，试验研究了正弦磁场下支承在盘型磁流变流体阻尼器上的柔性转子系统的动力特性．通过测量不同磁场频率和强度下转子系统的运动轨道、振动时间历程和不平衡响应曲线，并与恒定磁场下的结果进行了比较．结果发现，磁场的频率对盘型磁流变流体阻尼器的动力特性有着显著的影响．随着磁场频率的增大，盘型磁流变流体阻尼器抑制转子振动的能力减小，当磁场的频率高于一个临界频率后，转子系统的动力特性与无磁场时的动力特性相同，正弦磁场不能够控制磁流变流体阻尼器的动力特性．磁场强度越大，正弦磁场的临界频率越高．
英文摘要：
In order to understand the effect of alternating magnetic field on the dynamic performance of a disk-type magnetorheological （MR） fluid damper based on shear operation, the dynamic character of a flexible rotor supported on the disk-type MR fluid damper was experimentally studied under sinusoidal magnetic field. The motion orbits, vibration time histories and imbalance response curves of the rotor system at different magnetic field frequencies and densities were measured and compared with those at steady magnetic field. Results show that the magnetic field frequency has significant effect on the dynamic performance of the disk type MR fluid damper. Increases in magnetic field frequency decreases the capability of the dis-type MR fluid damper to reduce rotor vibration. The dynamic character of the rotor system is the same as that without magnetic field when the magnetic field frequency is over a critical frequency, and the sinusoidal magnetic field cannot control the dynamic performance of the disk-type MR fluid damper. The critical frequency of the sinusoidal magnetic field increases with increasing magnetic field density.
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