MATLAB CONTROL SYSTEM TOOLBOX 9 Guía de usuario descargar pdf (Pagina 610)

100

101

step

11-220

11step

Purpose Step response of LTI systems

Syntax step(sys)

step(sys,t)

step(sys1,sys2,...,sysN)

step(sys1,sys2,...,sysN,t)

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

[y,t,x] = step(sys)

Description step calculates the unit step response of a linear system. Zero initial state is

assumed in thestate-space case. Wheninvokedwithnooutput arguments,this

function plots the step response on the screen.

step(sys) plots the step response of an arbitrary LTI model sys.Thismodel

can be continuous or discrete, and SISO or MIMO. T he step response of

multi-input systems is the collection of step responses for each input channel.

The duration of simulation is determined automatically based on the system

poles and zeros.

step(sys,t) sets the simulation horizon explicitly. You can specify either a

final time

t = Tfinal (in seconds), or a vector of evenly spaced time samples

of the form

t = 0:dt:Tfinal

For discrete system s, the spacin g dt should match the sample period. For

continuous systems,

dt beco mes the samp le t ime of the discret ized simulation

model (see “Algorithm”), so make sure to choose

dt small enough to capture

transient phenomena.

To plot th e step r espo nses of se ve ral L TI m o dels

sys1,..., sysN on a si n gle

figure, use

step(sys1,sys2,...,sysN)

step(sys1,sys2,...,sysN,t)

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