MATLAB CONTROL SYSTEM TOOLBOX 9 Spécifications télécharger pdf (Page 362)

100

101

bode

16-22

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

second system

sys2.

When invoked with 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 the 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 are 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 computed for each SISO entry h

independently (h

is the transfer

function from input j to output i). The values

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

then characterize the response of h

at the frequency w(k).

Example You can plot the Bode response of the continuous SISO system

number of outputs

()

number of inputs

()×

length of

w()×

mag(1,1,k) hj

()

phase(1,1,k) hj

()∠

mag(i,j,k) h

()

phase(i,j,k) h

()∠

1 2 ... 357 358 359 360 361 362 363 364 365 366 367 ... 590 591

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MATLAB CONTROL SYSTEM TOOLBOX 9 Spécifications Page 362

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