MATLAB CONTROL SYSTEM TOOLBOX 9 Guide de l'utilisateur télécharger pdf (Page 79)

100

101

LTI Properties

2-35

This sets the Ts property to the v alue 0.5, as is confirmed by

h.Ts

ans =

0.5000

Forcontinuous-timemodels,thesampletimepropertyTs is 0 by convention.

For example, type

h = tf(1,[1 0]);

get(h,'Ts')

ans =

To leave the sample time of a discrete-time LTI model unspecified, set Ts to .

For example,

h = tf(1,[1 –1],–1)

produces

Transfer function:

-----

z – 1

Sampling time: unspecified

The same result is obtained by using the Variable property.

h = tf(1,[1 –1],'var','z')

In operatio ns that combine several discrete- time models, all specified sample

times must be identical, and the resulting discrete-time model inherits this

common sample time. The sample time of the resultant model is unspecified if

all operands have unspecified sample times. With this inheritance rule for

Ts,

the following two models are equivalent.

tf(0.1,[1 –1],0.1) + tf(1,[1 0.5],–1)

and

tf(0.1,[1 –1],0.1) + tf(1,[1 0.5],0.1)

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MATLAB CONTROL SYSTEM TOOLBOX 9 Guide de l'utilisateur Page 79

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