MATLAB CONTROL SYSTEM TOOLBOX 9 Betriebsanweisung PDF herunterladen (Seite 410)

100

101

bode

11-20

uses red dashed lines for the first system sys1 and green 'x' markers for the

second system

sys2.

When invoked w ith left-hand arguments

[mag,phase,w] = bode(sys)

[mag,phase] = bode(sys,w)

return the magnitude and phase (in degrees) of the frequency response at the

frequencies

w (in rad/sec). The outputs mag and phase are 3-D arrays with the

frequency as t he last dimension (see “Arguments” below for details). You can

convert the magnitude to decibels by

magdb = 20*log10(mag)

Remark If sys is an FRD model, bode(sys,w), w can only include frequencies in

sys.frequency.

Arguments The output arguments mag and phase a re 3-D arrays with dimensions

For SISO systems,

mag(1,1,k) and phase(1,1,k) give the magnitude and

phase of the response at the frequency =

w(k).

MIMO systems are treated as arrays of SISO systems and the magnitudes and

phases are computedforeach SISO entry independently( isthetransfer

function from input to output ). The values

mag(i,j,k) and phase(i,j,k)

then characterize the response of at the frequency w(k).

Example You can plot the Bode response o f the continuous SISO system

number of outputs

()

number of inputs

()×

length of

w()×

mag(1,1,k) hjω

()=

phase(1,1,k) hjω

()∠=

mag(i,j,k) h

jω

()=

phase(i,j,k) h

jω

()∠=

1 2 ... 405 406 407 408 409 410 411 412 413 414 415 ... 648 649

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