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引言在一般的CSCAA或CSCAD系统中,单变量反馈系统的频域稳定性分析过程均采用逐点计算系统开环函数的频响,再根据通常的裕量判据来处理,即通过计算截止频率w_T对应的相角φ(w_T)和穿越(交角)频率wπ所对应的开环增益K(wπ),由其符号判定系统闭环绝对稳定性,在系统稳定的情况下,φ(w_T)和K(wπ)就作为表征系统稳定程度的相对稳定性裕量。由于这种通常所用的裕量判据和裕量计算形式存在着一定的局限性(仅适用于系统开环传递出函数至多有一个截止频率和一个
INTRODUCTION In the general CSCAA or CSCAD system, the frequency domain stability analysis process of the univariate feedback system adopts the frequency response of the open-loop function of the system point by point and then is processed according to the common margin criterion, that is, by calculating the cutoff frequency and the open loop gain K (wπ) corresponding to the phase angle φ (w_T) and the crossing frequency (w_T) of w_T, the closed loop absolute stability of the system is judged by its sign. In the case of system stability, φ (w_T) and K (wπ) is used as a relative stability margin to characterize the stability of the system. Because of this commonly used margin criterion and margin calculation form has some limitations (only applies to the system open-loop transfer function up to a cut-off frequency and a