中文摘要：

分析了基于函数形式与模糊推理形式选择变论域伸缩因子的方法。针对模糊推理方法的不足做了细分伸缩因子变量的改进，并设计了误差分级选择伸缩因子的方法。以舞台影视系统中灯具所用直流电机为被控对象，采用三种不同的变论域模糊PID控制方法进行仿真实验比较。通过实验分析系统的动静态性能与鲁棒性，得出基于误差分级选择伸缩因子的方法性能更优的结论。系统响应不存在超调量，稳态调节时间短，且稳态调节精度高。

英文摘要：

The selection methods of the expansion factor are analyzed based on the function form and the fuzzy reasoning form. Subject to the disadvantages of the method of fuzzy reasoning, the segmentation expansion factor variable is modified and an error grade selection expansion factor method is designed. With the DC motor used in the movie and television system as the control plant, three different variable universe fuzzy PID control methods are compared with simulation experiments. Through analysis of the system＇ s dynamic and static performance and ro- bustness, it is concluded that the error grade select expansion factor method performs the best. There is no over- shoot in the system response, the steady-state adjustment time is short, and the adjustment precision is high.