零阶保持器频率特性的仿真研究

摘要

The frequency characteristic of zero order holder is one of the important concepts in studying the per-formance of sampling control system, but different phase frequency characteristic curves of zero order holder are presented with only conclusion in the published textbooks of automatic control principle, computer control technique and computer control system. In view of this situation, the frequency characteristic of zero order holder is simulated and researched in detail with three ways including of Pad6 approximation method, direct computation method and step-by-step computation method, and the results of the tree methods are same.%零阶保持器的频率特性是研究采样控制系统性能的重要概念之一，现有的“自动控制原理”、“计算机控制技术”和“计算机控制系统”课程的教材中零阶保持器的相频特性曲线不统一，且一般只给出简单结论。针对这一现状，本文分别采用Pade近似法、直接计算法和分步计算法对零阶保持器的频率特性进行了较详细的仿真研究，结果表明三种方法得到的结论一致。