The fundamental difference between sampling control system and continuous control system is that sampling system contains both continuous signal and discrete signal, and is a mixed signal system. The mathematical tool for analyzing and designing sampling system is Z transform, and the mathematical model used is difference equation and pulse transfer function. The necessary and sufficient condition for the stability of sampling system is that the characteristic roots of sampling system are all located in the unit circle of Z plane, the steady-state error of sampling system can be imitated from continuous system, the correction of sampling system includes continuous correction and digital correction, and the sampling period is an important parameter of sampling system, which has a great influence on the performance of the system. Finally, the application of MATLAB in sampling system is introduced. Characteristics of sampling control system, discretization of continuous signal, sampling theorem, signal recovery, holder, Z transform, difference equation, pulse transfer function, stability of sampling system, steady-state error of sampling system, analysis of sampling system, correction of sampling system, minimum beat controller. In recent years, with the rapid development of pulse technology, digital components, digital electronic computers, especially microprocessors, digital controllers have replaced analog controllers in many occasions. The application of digital controllers has greatly changed the nature of control system, so it is necessary to use sampling (or discrete) control theory to be introduced in this chapter to analyze and study its control performance. § 8.1 Overview§ 8.2 Sampling Process and Sampling Theorem§ 8.3 Sampling Signal Holder§ 8.4 Z Transform§ 8.5 Mathematical Model of Discrete System§ 8.6 Stability Analysis of Sampling Control Systems
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