MATLAB CONTROL SYSTEM TOOLBOX 9 Especificações descarregar pdf (Página 435)

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impulse

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16impulse

Purpose Compute the impulse response of LTI models

Syntax impulse(sys)

impulse(sys,t)

impulse(sys1,sys2,...,sysN)

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

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

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

Description impulse calculates the unit impulse response of a linear system. The impulse

response is the response to a Diracinput for continuous-timesystemsand

to a unit pulse at fordiscrete-time systems. Zero initialstate is assumed

in the state-space case. When invoked without left-hand arguments, this

function plots the impulse response on the screen.

impulse(sys) plots the impulse response of an arbitrary LTI model sys.This

modelcanbe continuous ordiscrete,and SISO orMIMO.The impulse response

of multi-input systems is the collection of impulse responses for each input

channel. The duration of simulation is determined automatically to display the

transient behavior of the response.

impulse(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 systems, the spacing dt should match the sample period. For

continuous systems,

dt becomes the sample time of the discretized simulation

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

dt small enough to capture

transient phenomena.

To plot the impulse responses of several LTI models

sys1,..., sysN on a single

figure, use

impulse(sys1,sys2,...,sysN)

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

()

t 0=

1 2 ... 430 431 432 433 434 435 436 437 438 439 440 ... 590 591

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