MATLAB CONTROL SYSTEM TOOLBOX 9 Guia do Utilizador descarregar pdf (Página 52)

100

101

2 LTI Models

2-8

Creating LTI Models

The functions tf, zpk, ss,andfrd creat e transfer function models,

zero-pole-gain models, state-space models, and frequency response dat a

models,respectively.Thesefunctionst ake themodeldataas inputandproduce

TF, ZPK, SS, or FRD objects that store this data in a single MATLAB variable.

This section shows how to create continuous or discrete, SISO or MIMO LTI

models with

tf, zpk, ss,andfrd.

Note: You can only specify TF, ZPK, and SS models for systems whose

transfer matrices have re al -val ued coefficients.

Transfer Function Models

This sectio n explains ho w to spec if y continuous-time SISO and MIMO trans fer

function models. T he specification of discrete-time transfer function models i s

asimpleextensionofthecontinuous-timecase(see“Discrete-TimeModels”on

page 2-2 0) . In this s ect io n you can also read about how t o specify transfer

functions consisting of pure gains.

SISO Transfer Function Models

A continuous-time SISO transfer function

is cha racterized by its numerator and denominator , both

polynom ials of the Laplace variable s.

There are two ways to specify SISO transfer functions:

• Using the

tf command

• As rational expressio ns in t he Laplace variable s

To spe c ify a S I SO transfe r function model usin g the

command, type

h = tf(num,den)

hs()

()

ds()

-----------=

()

()⁄=

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 648 649

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