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信号与系统学习零输入响应
2022-07-26 22:37:00 【久久鸭要变大鹅子】
文章目录
课程来自西电郭爷爷
LTI系统的零状态响应的函数lsim 调用格式为
y = lsim(sys,f,t)
t 表示计算系统响应的抽样点向量;
f 是系统输入信号
sys 是LTI系统模型,用来表示微分方程
系统模型sys 要借助tf函数获得,调用格式: sys = tf(b,a)
b 是微分方程右端的系数;从高阶导 到 低阶导 ,逗号隔开
a 是微分方程左端的系数
% 练y"(t)+2y'(t)+77y(t) = f(t) t>=0时 接入激励f(t) = 10sin(2Πt) 求其零状态响应
a = [0 0 1];
b = [1 2 77];
sys = tf(a,b);%这里注意是等号右侧系数在前
t = 0:0.01:5;
f = 10.*sin(2*pi*t);
y1 = lsim(sys,f,t);
subplot(2, 1, 1);
plot(t,y1)
t = 0:0.01:5;
f = 10.*sin(2*pi*t);
y2 = lsim(sys,f,t);
sys = tf(b,a);
subplot(2, 1 ,2);
plot(t,y2)
xlabel('Time(sec)')
ylabel('y(t)')
我这里是想试一下微分方程等号两侧系数写反会怎样
用了subplot想对比一下,发现是一样的···
回头再研究一下
现在先睡觉吧ZZZ
········
来自第二天的思考
应该就是一样的吧?
毕竟等号两侧,相当于无所谓系数的问题??
(欢迎大佬翻牌子了留言)
(顺带再吐槽一下,matlab直接保存图片到桌面上,打死上传不上了···我给截图然后就很容易传上来了····)
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