中文摘要：

为了提高使用偶极子模型分析磁流变液流变性能的准确性,采用偶极子模型与有限元模型对比的方法,分析了偶极子模型的适用范围,计算了不同体积分数磁流变液偶极子模型表面磁场的误差大小,并进行了实验验证。研究结果表明,磁流变液中软磁性颗粒主要受其相邻颗粒影响;偶极子模型表面磁场最大误差为62%,出现在两颗粒表面距离最近处,在磁流变液体积分数为6.5%时,偶极子模型误差最大值为3%,偶极子模型成立;体积分数为20%时,偶极子模型误差最大值达到19%,模型已经失效;外加均匀磁场大小对偶极子模型相对误差亦有影响,磁场越强,相对误差越小;实验与有限元分析结果基本一致,证明了理论分析的正确性。

英文摘要：

To improve the accuracy of calculating the rheological behavior of magnetorheological fluid by dipole approximation,the limits of validity for dipole approximation is analyzed by the method of comparing the dipole model with the finite element model,the errors of dipole approximation of magnetorheological fluid with different volume fractions are calculated.The results indicate that the particles are mainly affected by the adjacent particles,the maximum relative error of dipole approximation appears in the point nearing the adjacent particle and the value is 62%.When the volume fraction of magnetorheological fluid is 6.5%,the maximum error of dipole approximation is 3% and the dipole model is valid;while the volume fraction is 20%,the maximum error change to 19% and the dipole model is invalid.The external magnetic field has influence on the error of dipole approximation,the stronger the magnetic field,the little the relative error.The experimental results are the same as that of numerical simulation.