MATLAB CONTROL SYSTEM TOOLBOX 9 Specifikace stáhnout pdf (Strana 67)

100

101

Time Delays

2-49

You can also use the InputDelay and OutputDelay properties to conveniently

specify input or output delays in TF, ZPK, or FRD models. For example, you

can create the transfer function

by typing

s = tf('s');

H = [1/s ; 2/(s+1)]; % rational part

H.inputdelay = 0.1

The resulting model is displayed as

Transfer function from input to output...

#1: exp(–0.1*s) * -

#2: exp(–0.1*s) * -----

s + 1

By comparison, to produce an equivalent transfer function using the ioDelay

property, you would need to type

H = [1/s ; 2/(s+1)];

H.iodelay = [0.1 ; 0.1];

Notice that the 0.1 second delay is repeated twice in the I/Odelay matrix. More

generally, for a TF, ZPK, or FRD model with input delays and

output delays , the equivalent I/O delay matrix is

()

Ax t

()

t 0.1–

()

+ B

()

t 0.2+

()

t 0.1–

()

++=

t 0.3+

()

t 0.1–

()

++=

()

---

s 1+

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

= e

0.1s–

... α

,,[]

... β

,,[]

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 590 591

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