The problem of controller design is discussed for unity-feedback control systems satisfying steady state performance.
2
用算子符方法及傅里叶变换研究了单位反馈线性系统的一种辨识方法，并给出了辨识算式。
An identification procedure of nonlinear unit feedback system is investigated by means of operator notation and Fourier transform, and some formulas for identification are given.
3
任何预测必须在各业务单位的情况反馈回来后，根据环境的变化重新考虑。
When feedback from various operating units arrives, any forecast should be reviewed in the light of changing circumstances.
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