MATLAB CONTROL SYSTEM TOOLBOX 9 Uživatelská příručka stáhnout pdf (Strana 86)

100

101

2 LTI Models

2-42

Model Conversion

There are four LTI model types you can use with the Control System Toolbox:

TF,ZPK,SS,andFRD.Thissection shows how toconvertmodelsfromonetype

to the other.

Explicit Conversion

Model conversions are performed b y tf, ss, zpk,andfrd. Given any T F, S S, or

ZPK model

sys, the syntax for conversion to another model type is

Notice that FRD models can’t be converted to the other model types. In

addition, you must als o include a vector of f requencies (

frequency) as an input

argument when converting to an FRD model.

For example, you can convert the state-space model

sys = ss(–2,1,1,3)

to a zero-pole-gain model by typing

zpk(sys)

to which MATLAB responds

Zero/pole/gain:

3 (s+2.333)

-----------

(s+2)

Note that the transfer function of a state-space model with data is

sys = tf(sys) % Conversion to TF

sys = zpk(sys) % Conversion to ZPK

sys = ss(sys) % Conversion to SS

sys = frd(sys,frequency) % Conversion to FRD

ABCD

,,,()

Hs() DCsIA–()

–

B+=

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 648 649

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