如何利用传递函数建立matlab模型,利用matlab建立模型，求传递函数

满意答案

莉达思汀520omy

2018.12.17

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连续传递函数Ds用tf输入最方便，不知道为什么偏要用zpk。

频率预修正的双线性变换法需要指定截止频率，这里取了个2。

;; Ds=zpk([],[-1+sqrt(2)*i -1-sqrt(2)*i],1);

;; Dz1=zpk(c2d(Ds,1,;zoh;));

;; Dz1.Variable=;z^-1;

Zero/pole/gain:

0.22856 z^-1 (1+0.4884z^-1)

-----------------------------

(1 - 0.1147z^-1 + 0.1353z^-2)

Sampling time: 1

Overloaded functions or methods (ones with the same name in other directories)

doc ident/c2d

;; Dz2=zpk(c2d(Ds,1,;tustin;));

;; Dz2.Variable=;z^-1;

Zero/pole/gain:

0.090909 (1+z^-1)^2

-----------------------------

(1 - 0.1818z^-1 + 0.2727z^-2)

Sampling time: 1

;; Dz3=zpk(c2d(Ds,1,;matched;));

;; Dz3.Variable=;z^-1;

Zero/pole/gain:

0.1701 z^-1 (1+z^-1)

-----------------------------

(1 - 0.1147z^-1 + 0.1353z^-2)

Sampling time: 1

;; Dz4=zpk(c2d(Ds,1,;prewarp;,2));

;; Dz4.Variable=;z^-1;

Zero/pole/gain:

0.13855 (1+z^-1)^2

-----------------------------

(1 + 0.3743z^-1 + 0.2883z^-2)

Sampling time: 1

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