MATLAB CONTROL SYSTEM TOOLBOX 9 Spécifications télécharger pdf (Page 393)

100

101

damp

16-53

16damp

Purpose Compute damping factors and natural frequencies

Syntax [Wn,Z] = damp(sys)

[Wn,Z,P] = damp(sys)

Description damp calculates the damping factor and natural frequencies of the poles of an

LTI model

sys. When invoked without lefthand arguments, a table of the

eigenvalues in increasing frequency, along with their damping factors and

natural frequencies, is displayed on the screen.

[Wn,Z] = damp(sys) returns column vectors Wn and Z containing the natural

frequencies and damping factors of the poles of

sys. For discrete-time

systems with poles and sample time ,

damp computes “equivalent”

continuous-time poles by solving

The values

Wn and Z are then relative to the continuous-time poles . Both Wn

and Z are empty if the sample time is unspecified.

[Wn,Z,P] = damp(sys) returns an additional vector P containing the (true)

poles of

sys.NotethatP returns the same values as pole(sys) (up to

reordering).

Example Compute and display the eigenvalues, natural frequencies, and damping

factors of the continuous transfer function

Type

H = tf([2 5 1],[1 2 3])

Transfer function:

2 s^2 + 5 s + 1

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

s^2 + 2 s + 3

Type

()

5s 1++

2s 3++

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

1 2 ... 388 389 390 391 392 393 394 395 396 397 398 ... 590 591

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MATLAB CONTROL SYSTEM TOOLBOX 9 Spécifications Page 393

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