在自控中,常用波特图来描述频率响应,对于稳定性的判定会有两个参数 ,那就是幅值裕度和相角域度,通常情况下,利用后者进行判定,即相角裕度大于零,系统是稳定的,反之不稳定,但是对于幅值裕度,指的是相角为-180度时对应的幅值(这里是dB)。
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