中文摘要：

从根轨迹的角度研究了金属橡胶件对系统的影响，在合理简化和假设的系统模型基础上，分析了弹性系数对开环零极点分布及稳定域的影响；在双环控制器作用下，研究了弹性系数对闭环系统稳定域的影响。仿真结果表明，弹性系数越小，开环系统的不稳定极点远离虚轴，发散快，相应地，闭环系统的稳定裕度差。

英文摘要：

The effect of metal rubber damper on maglev system is investigated from the point of view of root locus. The effect of flexibility coefficient on zero-pole placement and stability of open-loop system is analyzed, based on the model right predigested and supposed. With double-loop controller, the effect of flexibility coefficient on stability region of closed-loop system is analyzed. The simulation results show that the smaller flexibility coefficient is, the further the instability-pole-plot of open-loop system is from imaginary axis, correspondingly, the closed-loop system obtains worse stability.