MATLAB CONTROL SYSTEM TOOLBOX 9 Guia do Utilizador descarregar pdf (Página 144)

100

101

4 Arrays of LTI Models

4-12

Building LTI Arrays

There are several ways to b uild LTI arrays:

• Using a

for loop to assign each model in the array

• Using

stack to concatenate LTI models into an LTI array

• Using

tf, zpk, ss,orfrd

In ad dition, you can use the command rss to generate LTI arrays of random

state-space models.

Generating LTI Arrays Using rss

A convenient way to generate arrays of state-space models with the same

number of states in each model is to use

rss. The syntax is

rss(N,P,M,sdim1,...,sdimk)

where

•

N is the number of states of each model in the LTI array.

•

P is the number of outputs of each model in the LTI array.

•

M is the number of inputs of each model in the LTI array.

•

sdim1,...,sdimk are the lengths of the array dimensions.

For example, to create a 4-by-2 array of random state-space models with three

states, one output, a nd one input, type

sys = rss(3,2,1,4,2);

size(sys)

4x2 array of continuous-time state-space models

Each model has 2 outputs, 1 input, and 3 states.

Building LTI Arrays Using for Loops

Consider the following second-order SISO transfer function that depends on

two parameters, and

ζω

Hs()

2ζωs ω

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1 2 ... 139 140 141 142 143 144 145 146 147 148 149 ... 648 649

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