MATLAB CONTROL SYSTEM TOOLBOX 9 Guía de usuario descargar pdf (Pagina 50)

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2 LTI Models

2-6

For example, the parallel connection of t wo LTI systems sys1 and sys2 can be

expr es sed as

sys = sys1 + sys2

because parallel connection amounts to adding the transfer matrices.

Similarly, subsystems of a given LTI model

sys can be extracted using

matrix-like subscripting. For instance,

sys(3,1:2)

provides the I/O relation between the first two inputs (column indices) and the

third output (ro w index), which is c onsistent with

for .

Command Summary

The next two tables give an overview of the main commands you can apply t o

LTI models.

Table 2-1: Creating LTI Models or Getting Data From Them

Command Description

drss

Generate random discrete state-space model.

dss

Create descriptor state-space model.

filt

Create discrete filter with DSP convention.

frd

Create an FRD model.

frdata

Retriev e FRD model data.

get

Query LT I model properties.

rss

Generate random continuous state-space model.

H 11,()H21,()

H21,()H22,()

H31,()H32,()

yHu=

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 648 649

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