MATLAB CONTROL SYSTEM TOOLBOX 9 Guide de l'utilisateur télécharger pdf (Page 628)

100

101

zpk

11-238

11zpk

Purpose Specify zero-pole-gain models or convert LTI model to zero-pole-gain form

Syntax sys = zpk(z,p,k)

sys = zpk(z,p,k,Ts)

sys = zpk(M)

sys = zpk(z,p,k,ltisys)

sys = zpk(z,p,k,'Property1',Value1,...,'PropertyN',ValueN)

sys = zpk(z,p,k,Ts,'Property1',Value1,...,'PropertyN',ValueN)

sys = zpk('s')

sys = zpk('z')

zsys = zpk(sys)

zsys = zpk(sys,'inv') % for state-space sys only

Description zpk isused tocreate zero-pole-gainmodels(ZPK objects) or to convertTF orSS

models to zero-pole-gain form.

Creation of Zero-Pole-Gain Models

sys = zpk(z,p,k) creat es a cont inuous -time zero-pole-gain mo del with ze ro s

z,polesp, and g ain(s) k. The output sys is a ZPK object storing the model data

(see “LTI Objects” on page 2-3).

In the SISOcase,

z and p are the vectors ofreal or complex conjugate zeros and

poles, and

k is the r ea l-va lue d scal ar gain.

Set

z or p to [] for systems without zeros or poles. These two vectors need not

have equal length and the model need not be proper (that is, have an excess of

poles).

You can also use rational expressions to create a ZPK model. To do so, use

either:

hs() k

sz1

()–()

sz2

()–()

... szm

()–()

sp1()–()sp2()–()... spn()–()

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MATLAB CONTROL SYSTEM TOOLBOX 9 Guide de l'utilisateur Page 628

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