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Root-Locus Method

Root Locus Breakaway and Stability Points

Description

Root locus analysis tracks how system poles move as gain changes. It shows when poles leave the real axis, move into the complex plane, and affect stability. For high school students studying control systems, the key ideas are breakaway points, break-in points, and jω-axis crossings.

Breakaway po...

Transcript

当系统极点从实平面过渡到复平面时,根轨迹通常会发散。

分离点和会合点指示了根轨迹离开和重新回到实轴的位置。根轨迹分支与实轴形成 180/n 度的夹角。

增益在实轴上开环极点之间的分离点处达到峰值,而最小增益则出现在两个零点之间的汇合点处。

增加增益可能会使某些系统极点移入右半平面,表明系统可能存在不稳定性。虚轴(jω轴)的穿越点标志着系统稳定与不稳定运行状态的分界。

根轨迹分析涉及确定特定点并计算其对应的增益。

为了确定根轨迹在穿过特定阻尼比线时的精确坐标,需沿该线选择若干测试点,并计算各点的角度和。

根轨迹存在于总角度之和等于180度的奇数倍的位置。

该特定点的增益通过...

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