MATLAB CONTROL SYSTEM TOOLBOX 9 Betriebsanweisung PDF herunterladen (Seite 469)

100

101

frd

11-79

11frd

Purpose Create a frequency response data (FRD) object or convert another model type

to an FRD model

Syntax sys = frd(response,frequency)

sys = frd(response,frequency,Ts)

sys = frd

sys = frd(response,frequency,ltisys)

sysfrd = frd(sys,frequency)

sysfrd = frd(sys,frequency,'Units',units)

Description sys = frd(response,frequency) creates an FRD model sys from the

frequency response data stored in the mul tidimensional array

response.The

vector

frequency represents the underlying frequencies for the frequency

response data. See Table 11-14, “Data Format for the Argument response in

FRD Models,” on page 80.

sys = frd(response,frequency,Ts) creates a discrete-time FRD model sys

with scalar sample time Ts.SetTs = –1 to create a discrete-time FRD model

without specifying the samp le time.

sys = frd create s an empty FRD model.

The input argument list for any of these syntaxes can be followed by property

name/property v alue pairs of the form

'PropertyName',PropertyValue

Youcan use theseextra argumentsto set the various propertiesof FRD models

(see the

set command, or “LTI Properties” on page 2-26 and “Model-Specific

Properties” on page 2-28). These properties include

'Units'. The default units

for FRD models are in

'rad/s'.

To force an FRD model

sys to inherit a ll of its generic LTI properties from any

existing LTI model

refsys,usethesyntaxsys =

frd(response,frequency,ltisys)

sysfrd = frd(sys,frequency) converts a TF, SS, or ZPK model to an FRD

model. T he frequency response is computed at the frequencies provided by the

vector

frequency.

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