求取闭环极分布问题的实质
当闭环系统没有零点与极点相消时，闭环特征方程式的根就是闭环传递函数的极点，我们常简称之为闭环极点。因此，从已知的开环零、极点位置及某一变化的参数来求取闭环极点的分布，实际上就是解决闭环特征方程式的求根问题。
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