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中文摘要：
为了建立旋转机械转子系统剪切型磁流变脂阻尼器准确的动力模型，用有限元法分析了剪切型磁流变脂阻尼器的磁场特性，从试验上详细地研究了剪切型磁流变脂阻尼器一悬臂柔性转子系统在不同转子不平衡量和磁场强度下的不平衡响应，并用Bingham流体模型对试验中观察到的现象进行了分析。结果表明：磁流变脂在不同的剪切速度和磁场强度条件下具有十分复杂的流变特性。在剪切型磁流变脂阻尼器一柔性转子系统中观察到的诸如轴颈的“松动”现象，阻尼器的软力特性，以及以转子峰值共振转速随磁场强度发生明显移动为特征的“刚化”效应等重要现象有利于建立阻尼器模型。Bingham流体模型只能解释试验中观察到的轴颈“松动”现象，但不能解释其它现象。在建立转子系统剪切型磁流变脂阻尼器动力模型时必须考虑磁流变脂“刚化”效应的影响。
英文摘要：
In order to build a accurate model of dynamic behavior of shear-type magnetorheologic grease（MRG） damper for rotor system of rotating machinery, the magnetic field distribution of the shear-type MRG damper was analyzed by the finite element method and the unbalance response of an overhung-disk flexible rotor supported on the shear-type MRG damper were experimentally investigated at different magnetic flux densities and rotor imbalances, the related phenomena observed were theoretically analysed on the basis of the Bingham fluid mode. Results show that rheological behaviors of the MRG at different shear velocities and magnetic flux densities are very complex. There exist many important phenomena that will be helpful to model the shear-type MRG damper, such as the break-loose of the journal, the softening fluid force produced by the shear-type MRG damper and stiffening effect characterized by the shift of the peak resonant rotational speed with the magnetic flux density. The Bingham fluid model only can explain the break-loose phenomenon, but is difficult to explain the other phenomena. The stiffening effect of the MRG should be considered in modeling the dynamic behavior of shear-type MRG damper for rotor system.
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