第十四章单元测试
In the following 2DOF control system, the feedforward controller F(s) can change the stability of the unit-feedback system which includes the feedback controller C(s). （ ）- Feedback can reduce the sensitivity of a transfer function to parameter changes. （ ）
For the following closed-loop system, the input disturbance d(t) is sinusoidal wave with frequency ω=2rad/s, what will be the structure of feedback controller, C(s), for attenuating output due to input disturbance? (Note:
and 
are polynomial forms without any integers.) （ ）- What can be the feedforward controller for the unit feedback system with closed-loop transfer function of
? （ ） - What applications can the Internal Model Principle be applied to deal with disturbances? （ ）
A:错 B:对
答案:错
A:对 B:错
A:
B:
C:
D:
A:
B:
C:
D:
A:Sudden aperiodic disturbances B:Hard disk drive industry for compensation of repeatable run-outs C:Roll-eccentricity compensation in Rolling Mills D:Random disturbances
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