磁流变弹性体的动态力学特性具有可调性，因此可用于提升汽车隔振系统性能。为探究磁敏橡胶悬置对汽车隔振系统动力学行为的影响，采用分数阶算子和非线性模型描述磁敏橡胶的流变学特性和幅值依赖性。基于磁流变弹性体的非线性黏弹性本构关系，并考虑弹性基础和车身-悬置的耦合作用，构建了汽车动力总成悬置系统的动力学模型。通过数值仿真方法，在汽车启动工况和匀速行驶工况下，研究了磁敏橡胶悬置的非线性黏弹性特性对汽车振动系统动力学行为的影响。结果表明：动力总成和车身的位移响应幅值随着分数阶数和非线性系数的增大而减小，因此，增强磁敏橡胶黏性及幅值依赖性能够影响振动系统刚度，进而有效提高汽车悬置的隔振效果。

The tunable dynamic mechanical property of MRE (magnetorheological elastomers) is desirable for improving the performance of automotive vibration isolation systems. The influence of magneto-sensitive rubber mounts on the dynamic behavior of automotive vibration isolation systems was investigated. The fractional-order derivative operator was introduced into a nonlinear model to characterize the rheological properties and amplitude dependence of the magneto-sensitive rubber. Based on the nonlinear viscoelastic constitutive relationship of magnetorheological elastomers, a nonlinear fractional-order dynamic model was developed. This model incorporated the elastic foundation and the coupling effect between the vehicle and suspension to analyze an automotive powertrain mounting system. Using numerical simulations, the effects of nonlinear viscoelastic properties on dynamic behavior were evaluated under engine start-up and constant-speed driving conditions. The results indicate that the displacement response amplitudes of the powertrain and the vehicle body decrease with increasing the fractional order and the nonlinear coefficient. Therefore, the vibration isolation performance of automotive mounts can be effectively improved by adjusting the stiffness of vibration isolation systems, which can be achieved by enhancing the viscosity and the amplitude dependence of magneto-sensitive rubber.