MATLAB CONTROL SYSTEM TOOLBOX 9 Guía de usuario descargar pdf (Pagina 96)

100

101

2 LTI Models

2-52

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

ioDelayMatrix property, you would need to type

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

H.iodelay = [0.1 ; 0.1];

Notice that the0.1 second delay is repeated twiceinthe I/O delay matrix. More

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

output delays , the equivalent I/O delay matrix is

Specifying Delays in Discrete-Time Models

You can also use the ioDelayMatrix, InputDelay,andOutputDelay properties

to specify delays in discrete-time LTI models. You specify time delays in

discrete-time models withintegermultiples ofthe samplingperiod.Theinteger

k you supply for the time delay of a discrete-time model specifies a time delay

of k sampling periods. Such a delay contributes a factor to the transfer

function.

For example,

h = tf(1,[1 0.5 0.2],0.1,'inputdelay',3)

...

,,[]

...

,,[]

+α

+... α

+ α

:: :

+α

+... α

–

1 2 ... 91 92 93 94 95 96 97 98 99 100 101 ... 648 649

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