MATLAB CONTROL SYSTEM TOOLBOX 9 Spécifications télécharger pdf (Page 26)

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101

2 LTI Models

2-8

Creating LTI Models

The functions tf, zpk, ss,andfrd create transfer function models,

zero-pole-gain models, state-space models, and frequency response data

models,respectively.Thesefunctionstake themodeldataasinputandproduce

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 real-valued coefficients.

Transfer Function Models

This section explains how to specify continuous-time SISO and MIMO transfer

function models. The specification of discrete-time transfer function models is

asimpleextensionofthecontinuous-timecase(see“Discrete-TimeModels”on

page 2-19). In this section you can also read about how to specify transfer

functions consisting of pure gains.

SISO Transfer Function Models

A continuous-time SISO transfer function

is characterized by its numerator and denominator , both

polynomials of the Laplace variable s.

There are two ways to specify SISO transfer functions:

•Using the

tf command

•As rational expressions in the Laplace variable s

To specify a SISO transfer function model using the

command, type

h = tf(num,den)

()

-----------

()

hs() ns()ds()⁄=

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 590 591

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