中文摘要：

对一种新型磁流变液传动器件——磁流变液联轴器的磁场进行了有限元分析,研究了工作区的间隙对磁流变液联轴器磁感应强度和剪切应力的大小及分布的影响。通过分析表明,当工作区间隙由0.2mm增加到2.0mm时,工作区的磁感应强度逐渐减小,而磁感应强度和剪切应力沿长度方向的分布却逐渐趋于均匀,磁感应强度最大值与最小值之差由0.65T减小到0.35T;无论是当工作区磁流变液的磁场达到饱和时,还是当磁感应强度使剪切应力达到屈服值时,剪切应力都不会再随磁感应强度升高而增大。通过计算可知,对于所研究的直径与长度之比为5/7的磁流变液联轴器,当工作区间隙由0.2mm增加到2.0mm时,它所能传递的工作扭矩仅降低25%。因此在设计其磁场时应综合计及加工、安装精度及生产成本等因素合理选择工作区的间隙,推荐选用1.2mm左右的工作间隙。

英文摘要：

This paper studies the influence of working gap on the magnitude and distribution of the magnetic fielc density and the shear stress of a magneto-rheological coupler. The results of FEA and experiments indicate tha the magnitude of the magnetic field density decreases with the increase of the working gap, while the distribu tion of the magnetic field density and the shear stress becomes more uniform along the axial direction. Becaus（ of the magnetic saturation and the existence of the stress yield of the magneto-rheological fluid, the workin gap, for the range of 0.2 to 1.2ram, has limited influence on the magnetic flux density and the stress. The fur ther computational results show that the transmission torque only decreases 25% in this procedure. Base of these findings, the working gap should be chose properly to get a sufficient magnetic field and transmissiol torque for a given device with consideration of machining and assembling cost associated with a smaller workin gap.