In the period of classical control theory, what are the main methods to analyze and design automatic control systems? What are the principles and thinking methods?

The analysis of automatic control system in classical control theory is divided into three parts:

1. There are three kinds of linear analysis for linear systems: time domain analysis, frequency domain analysis and root locus analysis, and nonlinear systems are analyzed by description function and phase plan diagram.

Three. The analysis of discrete system is based on Z-transform to get the mathematical model and analyze it.

The design of control system mainly considers three aspects: stability, accuracy and rapidity, so as to meet the requirements of users as much as possible. For example, the design system has no difference under the given disturbance and no difference under the input with disturbance, and the corresponding optimal system is designed for users to meet the requirements and achieve the best stability indicators, such as Wc phase angle margin and time overshoot.

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