MATLAB CONTROL SYSTEM TOOLBOX 9 Spécifications télécharger pdf (Page 36)

100

101

2 LTI Models

2-18

•response is a vector of length Nf of complex frequency response values for

these frequencies.

•

units is an optional string for the units of frequency: either 'rad/s' (default)

or '

Hz'

For example, the MAT-file

LTIexamples.mat contains a frequency vector freq,

and a corresponding complex frequency response data vector

respG.Toload

this frequency-domain data and construct an FRD model, type

load LTIexamples

sys = frd(respG,freq)

Continuous-time frequency response with 1 output and 1 input

at 5 frequency points.

From input 1 to:

Frequency(rad/s) output 1

---------------- --------

1 –0.812505 –0.000312i

2 –0.092593 –0.462963i

4 –0.075781 –0.001625i

5 –0.043735 –0.000390i

ThesyntaxforcreatingaMIMOFRDmodelisthesameasfortheSISOcase,

except that

response is a p-by-m-by-Nf multidimensional array, where p is the

number of outputs, m is the number of inputs, and Nf is the number of

frequency data points (the length of

frequency).

The following table summarizes the complex-valued response data format for

FRD models.

Table 2-3: Data Format for the Argument response in FRD Models

Model Form Response Data Format

SISO model Vector of length Nf for which response(i) is the

frequency response at the frequency

frequency(i)

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 590 591

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