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根轨迹与系统性能的关系

通过分析根轨迹图，可以分析系统的稳定性、稳态性能和动态性能：
- 稳定性：系统根轨迹若不穿过虚轴则系统对所有$K$值都是稳定的；根轨迹若穿过虚轴则$K$值大于系统临界开环增益时系统不稳定

- 稳态性能：暂且略过

- 动态性能：根据系统根轨迹在复平面上的不同位置，可以判断系统输出类型的变化以及临街增益。比如在系统稳定的情况下，根轨迹在实轴上时系统为过阻尼系统，根轨迹在虚轴上时系统为振荡系统，根轨迹在其他位置时系统为阻尼振荡系统

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Summary

statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

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