MATLAB CONTROL SYSTEM TOOLBOX 9 Guia do Utilizador descarregar pdf (Página 146)

100

101

4 Arrays of LTI Models

4-14

The first two colon indices ( ) select all I/O channels from the I/O dimensions

H. Thet hird indexof H refers to the first array dimension ( ),whilethefourth

index is for the second array dimension ( ).

Suppose the limits of the ranges of values for and are [0.66,0.76] and

[1.2,1.5], respectively. Enter these at the command line.

zeta = [0.66,0.75];

w = [1.2,1.5];

Since the four models have the same parametric structure, it’s convenient to

use two nested

for loops to construct t he LTI array.

for i = 1:2

for j = 1:2

H(:,:,i,j) = tf(w(j)^2,[1 2*zeta(i)*w(j) w(j)^2]);

end

now contains the four models in a 2-by-2 array. For example, to display the

transfer function in the (1,2) position of the array, type

H(:,:,1,2)

Transfer function:

2.25

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

s^2 + 1.98 s + 2.25

1 2 ... 141 142 143 144 145 146 147 148 149 150 151 ... 648 649

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