MATLAB CONTROL SYSTEM TOOLBOX 9 Spécifications télécharger pdf (Page 536)

100

101

sigma

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w = {wmin,wmax}. To use particular frequency points, set w to the

corresponding vector of frequencies. Use

logspace to generate logarithmically

spaced frequency vectors. The frequencies must be specified in rad/sec.

sigma(sys,[],type) or sigma(sys,w,type) plots the following modified

singular value responses:

These options are available only for square systems, that is, with the same

number of inputs and outputs.

To superimpose the singular value plots of several LTI models on a single

figure, use

sigma(sys1,sys2,...,sysN)

sigma(sys1,sys2,...,sysN,[],type) % modified SV plot

sigma(sys1,sys2,...,sysN,w) % specify frequency range/grid

The models sys1,sys2,...,sysN need not have the same number of inputs

andoutputs.Eachmodelcanbeeithercontinuous-ordiscrete-time.Youcan

also specify a distinctive color, linestyle, and/or marker for each system plot

with the syntax

sigma(sys1,'PlotStyle1',...,sysN,'PlotStyleN')

See bode for an example.

When invoked with output arguments,

[sv,w] = sigma(sys)

sv = sigma(sys,w)

return the singular values sv of the frequency response at the frequencies w.

For a system with

Nu input and Ny outputs, the array sv has min(Nu,Ny) rows

and as many columns as frequency points (length of

w). The singular values at

the frequency

w(k) are given by sv(:,k).

type = 1

Singular values of the frequency response , where is

the frequency response of

sys.

type = 2

Singular values of the frequency response .

type = 3

Singular values of the frequency response .

1–

IH+

1–

1 2 ... 531 532 533 534 535 536 537 538 539 540 541 ... 590 591

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MATLAB CONTROL SYSTEM TOOLBOX 9 Spécifications Page 536

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