控制工程基础仿真实验报告清华大学(17)

10年,控制工程基础MATLABF仿真实验报告

den1=[0.000016,0.004,0,0]; num2=[8.315,32.48];

den2=[0.000072,0.018,0,0]; hold on;

bode(num1,den1); bode(num2,den2); grid

系统开环伯德图

从中可见，C4=0.47μF时，系统的开环剪切频率没有变化，但是相位裕量比C4=0.1μF时要稍大一些。

建立两个系统的闭环单位阶跃输入模型，编程如下

num1=[0.091366,24.5,415.3];

den1=[0.000016,0.004,1.786,32.48]; num2=[0.425,108,415.3];

den2=[0.000072,0.018,8.315,32.48]; hold on;

step(num1,den1); gtext('C=0.1μF') step(num2,den2); gtext('C=0.47μF')