Nyquist criterion is widely used in electrical engineering and automatic control engineering, as well as other areas, to design and analyze the system with feedback. While Nyquist is one test most general stability, it also has many limitations for linear systems, the system time invariant (LTI). The non-linear system to use more complex standards dinhphuc glitches, such as standard Lyapunovhoac circle. While Nyquist is a graphical techniques, it only provides a limited amount of visual to explain why a system is stable or unstable, or how to turn a system from unstable to stabilize.
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