lab03.m

控制系统仿真中的频率特性的MATLAB源码

function lab03()

clear all;
clc;


col0=[0.7 0.7 0.7]; %灰色
col1=[1 1 1]; %白色

mainwin=figure('Color',col0,'Pos',[100 150 600 400],...
      'Name','方框图模型','NumberTitle','off',...
      'MenuBar','none','Resize','off');

dd=text(0.28,0.98,'频域实验窗口');
set(dd,'fontsize',20,'color',[0,0,1],'fontname','宋体');
hold on;

%输入前向通道参数按钮
uicontrol('style','push','units','normal','pos',[0.4 0.68 0.15 0.1],'string','G(s)',...
        'fontsize',15 ,'call','input_g');
     
%输入反馈参数按钮
uicontrol('style','push','units','normal','pos',[0.4 0.46 0.15 0.1],'string','H(s)',...
         'fontsize',15,'call','input_h');

%画一个比较器
uicontrol('style','radio','units','normal','pos',[0.2 0.72 0.03 0.04],'enable','off','back',col0)

%画根轨迹图
push1=uicontrol('style','push','units','normal','pos',[0.1 0.31 0.22 0.1],...
         'string','开环bode图','fontsize',15,'call','bode1');
push2=uicontrol('style','push','units','normal','pos',[0.35 0.31 0.22 0.1],...
         'string','闭环bode图','fontsize',15,'call','bode2');
     push3=uicontrol('style','push','units','normal','pos',[0.1 0.15 0.22 0.1],...
         'string','nyquist曲线','fontsize',15,'call','nyquist');
     push4=uicontrol('style','push','units','normal','pos',[0.35 0.15 0.22 0.1],...
         'string','nichols曲线','fontsize',15,'call','nichols');

%关闭按钮
uicontrol('style','push','units','normal','pos',[0.7 0.15 0.20 0.1],'string','退出',...
         'fontsize',15,'call',['clear all;clc;close;']);
%画方框图的信号线
x=[0 0.88 0.8 0.8 0.11 0.11];
y=[0.77 0.77 0.77 0.5 0.5 0.77];
plot(x,y,'k');
hold on;
%画负反馈的'-'号
x=[0.05 0.08];y=[0.7 0.7];
plot(x,y,'k');
hold on;
%画信号线上的箭头
x=[0.06 0.09 0.06];
y=[0.79 0.77 0.75];
plot(x,y,'k');hold on;
x=[0.85 0.88 0.85];
y=[0.79 0.77 0.75];
plot(x,y,'k');hold on;
x=[0.095 0.11 0.125];
y=[0.7 0.75 0.7];
plot(x,y,'k');hold on;
dd=text(-0.1,0.85,'输入R(t)');
set(dd,'fontsize',15,'color',[0,0,1],'fontname','宋体');
dd=text(0.8,0.85,'输出C(t)');
set(dd,'fontsize',15,'color',[0,0,1],'fontname','宋体');

axis([0 1 0 1]);
axis off;