摘要分析控制系统的零点和响应曲线，对于我们研究自动控制系统的动态性能具有非常重要的现实意义。在日常生活中，控制系统随处可见，很多控制系统都采用了高阶系统来进行控制。很多高阶系统不能用一阶和二阶系统进行近似表示，这类高阶系统动态性能的确定往往比较困难。对高阶系统动态性能的近似分析，可以利用闭环主导极点作为切入点，得出控制系统动态性能指标的估算公式。27495
本文是通过对高阶系统在单位阶跃响应下的时域分析，得到相应的动态性能指标估算方法，并对系统的动态性能进行分析。本文选取三阶系统作为研究的对象，运用MATLAB软件建立了系统仿真模型，对选取的控制系统进行仿真分析。通过对比不同零点下系统的动态性能指标，研究系统零点位置的分布对各动态性能指标变化趋势的影响，最终归纳总结出该类系统闭环零点的影响。
关键词  高阶系统  动态性能  零点  响应曲线  仿真模型
毕业设计说明书（毕业论文）外文摘要
Title  Study on zero Points and Variation Trend of One Type                                                   
    of Control  System
Abstract
Analysing the zero point and the response curve of the control system is very important for us to study the dynamic performance of the system.In the daily life, the control system can be seen everywhere, and many control systems use the higher order system to control.For the higher order systems which can not be approximated by the one or two order systems, the dynamic performance of the index is more complex. The approximate analysis of the higher order systems is usually closed by the closed-loop dominant pole as the starting point, and then the estimation formula of the dynamic performance of the higher order control system is obtained.
In this paper, the dynamic performance index estimation method is obtained by analyzing the time domain of the high order system under the step response of the unit step response, and the dynamic performance of the system is analyzed.This paper selects the three order system as the object of study, and uses MATLAB software to establish the system simulation model, and simulates the selected control system.Through comparing the dynamic performance index of the systems of different zero points，the effect of the distribution of the zero position of the system on the variation trend of the dynamic performance index is studied, and the effect of the closed-loop zero of the system is concluded finally.
Keywords  Higher order system  Dynamic performance  Zero point  Response curve  Simulation model   
目次
1  绪论    1
1．1  课题研究背景及意义    1
1．2  自动控制的目的和控制理论的研究现状    1
1．3  关于一类控制系统的选取    2
1．4  本文主要研究内容    2
2  高阶系统的时域分析    4
2．1  高阶系统的单位阶跃响应    4
2．2  闭环主导极点    6
2．3  高阶系统的动态性能估算    7
2．4  本章小结    11
3  三阶系统响应曲线的MATLAB实现    12
3．1  利用MATLAB绘制响应曲线    12
3．2  本章小结    14
4  不同零点分布的三阶系统响应曲线的仿真    15 MATLAB一类控制系统零点与响应曲线变化趋势研究:http://www.youerw.com/zidonghua/lunwen_21990.html