MATLAB CONTROL SYSTEM TOOLBOX 9 Guia do Utilizador descarregar pdf (Página 540)

100

101

nichols

11-150

When i nvoked with left-hand arguments,

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

[mag,phase] = nichols(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 similar to

those produced by

bode (see bode on page 11-19). They have dimensions

Remark If sys is an FRD model, nichols(sys,w), w can o nly include frequencies in

sys.frequency.

Example Plot the Nichols response of the system

num = [–4 48 –18 250 600];

den = [1 30 282 525 60];

H = tf(num,den)

nichols(H); ngrid

number of outputs

()

number of inputs

()×

length of

w()×

Hs()

– 48s

18s

– 250s 600+++

30s

282s

525s 60++ ++

---------------------------------------------------------------------------------------=

1 2 ... 535 536 537 538 539 540 541 542 543 544 545 ... 648 649

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