点击次数：

所属单位：能源与动力学院

发表刊物：Adv Astronaut Sci

摘要：Root locus plots are one of the basic design tools in classical control. They help the designer tune control gains which appear linearly in the coefficients of the closed loop characteristic polynomial. And they give considerable intuition to the designer, based on the simple rules that root loci must follow. When designing a control system, one wants to know where the zeros are, but when designing a digital control system new issues appear. The original zero locations when mapped to discrete time are functions of the new parameter, the sample time T (as well as the pole locations). In addition, new zeros are usually introduced by the discretization process. The purpose of this paper is to give a general understanding of the nature of root loci of discrete time transfer function zeros as a function of this parameter T. We consider the complete range of values from T equal zero to infinity to understand the full plot. Reasonable sample rates will only use part of the plots. The characteristic polynomial coefficients are nonlinear functions of T so the usual root locus rules do not apply. One can be amazed at how the usual root locus rules are repeatedly violated, and what new kinds of unexpected behavior can be observed. © 2018 Univelt Inc. All rights reserved.

学科门类：工学

一级学科：航空宇航科学与技术

文献类型：J

ISSN号：0065-3438

是否译文：否

发表时间：2018-01-01

合写作者：Longman, Richard W.

通讯作者：Longman, Richard W.,周文祥