MATLAB CONTROL SYSTEM TOOLBOX 9 Dokumentacja Pobierz pdf (Strona 562)

100

101

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To do this, type

sys = ss([-2 -1;1 -2],[1 1;2 -1],[1 0],[0 1])

tf(sys)

Transfer function from input 1 to output:

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

s^2 + 4 s + 5

Transfer function from input 2 to output:

s^2 + 5 s + 8

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

s^2 + 4 s + 5

Example 5

You can use a

for loop to specify a 10-by-1 array of SISO TF models.

s = tf('s')

H = tf(zeros(1,1,10));

for k=1:10,

H(:,:,k) = k/(s^2+s+k);

end

The first statement pre-allocates the TF array and fills it with zero transfer

functions.

Discrete-Time

Conventions

The control and digital signal processing (DSP) communities tend to use

different conventions to specify discrete transfer functions. Most control

engineers use the variable and order the numerator and denominator terms

in descending powers of , for example,

2– 1–

12–

,= B

21–

,= C

,= D

hz()

2z 3++

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

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